4cfad5ae0f
- 全新ui - 全面优化websocket逻辑，提高数字人和ui连接的稳定性及资源开销 - 全面优化唤醒逻辑，提供稳定的普通唤醒模式和前置词唤醒模式 - 优化拾音质量，支持多声道麦克风拾音 - 优化自动播放服务器的对接机制，提供稳定和兼容旧版ue工程的对接模式 - 数字人接口输出机器人表情，以适应新fay ui及单片机的数字人表情输出 - 使用更高级的音频时长计算方式，可以更精准控制音频播放完成后的逻辑 - 修复点击关闭按钮会导致程序退出的bug - 修复没有麦克风的设备开启麦克风会出错的问题 - 为服务器主机地址提供配置项，以方便服务器部署
5230 lines
226 KiB
HTML
5230 lines
226 KiB
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<title>FFmpeg Formats Documentation</title>
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<meta name="description" content="FFmpeg Formats Documentation">
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<meta name="keywords" content="FFmpeg Formats Documentation">
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<div class="top-level-extent" id="SEC_Top">
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<div class="element-contents" id="SEC_Contents">
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<h2 class="contents-heading">Table of Contents</h2>
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<div class="contents">
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<ul class="toc-numbered-mark">
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<li><a id="toc-Description" href="#Description">1 Description</a></li>
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<li><a id="toc-Format-Options" href="#Format-Options">2 Format Options</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Format-stream-specifiers-1" href="#Format-stream-specifiers-1">2.1 Format stream specifiers</a></li>
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</ul></li>
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<li><a id="toc-Demuxers" href="#Demuxers">3 Demuxers</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-aa" href="#aa">3.1 aa</a></li>
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<li><a id="toc-aac" href="#aac">3.2 aac</a></li>
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<li><a id="toc-apng" href="#apng">3.3 apng</a></li>
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<li><a id="toc-asf-1" href="#asf-1">3.4 asf</a></li>
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<li><a id="toc-concat-1" href="#concat-1">3.5 concat</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Syntax" href="#Syntax">3.5.1 Syntax</a></li>
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<li><a id="toc-Options" href="#Options">3.5.2 Options</a></li>
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<li><a id="toc-Examples" href="#Examples">3.5.3 Examples</a></li>
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</ul></li>
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<li><a id="toc-dash-1" href="#dash-1">3.6 dash</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-1" href="#Options-1">3.6.1 Options</a></li>
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</ul></li>
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<li><a id="toc-ea" href="#ea">3.7 ea</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-2" href="#Options-2">3.7.1 Options</a></li>
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</ul></li>
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<li><a id="toc-imf" href="#imf">3.8 imf</a></li>
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<li><a id="toc-flv_002c-live_005fflv_002c-kux" href="#flv_002c-live_005fflv_002c-kux">3.9 flv, live_flv, kux</a></li>
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<li><a id="toc-gif-1" href="#gif-1">3.10 gif</a></li>
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<li><a id="toc-hls-1" href="#hls-1">3.11 hls</a></li>
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<li><a id="toc-image2-1" href="#image2-1">3.12 image2</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-1" href="#Examples-1">3.12.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-libgme" href="#libgme">3.13 libgme</a></li>
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<li><a id="toc-libmodplug" href="#libmodplug">3.14 libmodplug</a></li>
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<li><a id="toc-libopenmpt" href="#libopenmpt">3.15 libopenmpt</a></li>
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<li><a id="toc-mov_002fmp4_002f3gp" href="#mov_002fmp4_002f3gp">3.16 mov/mp4/3gp</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-3" href="#Options-3">3.16.1 Options</a></li>
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<li><a id="toc-Audible-AAX" href="#Audible-AAX">3.16.2 Audible AAX</a></li>
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</ul></li>
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<li><a id="toc-mpegts" href="#mpegts">3.17 mpegts</a></li>
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<li><a id="toc-mpjpeg" href="#mpjpeg">3.18 mpjpeg</a></li>
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<li><a id="toc-rawvideo" href="#rawvideo">3.19 rawvideo</a></li>
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<li><a id="toc-sbg" href="#sbg">3.20 sbg</a></li>
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<li><a id="toc-tedcaptions" href="#tedcaptions">3.21 tedcaptions</a></li>
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<li><a id="toc-vapoursynth" href="#vapoursynth">3.22 vapoursynth</a></li>
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</ul></li>
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<li><a id="toc-Muxers" href="#Muxers">4 Muxers</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-a64-1" href="#a64-1">4.1 a64</a></li>
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<li><a id="toc-adts-1" href="#adts-1">4.2 adts</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-4" href="#Options-4">4.2.1 Options</a></li>
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</ul></li>
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<li><a id="toc-aiff-1" href="#aiff-1">4.3 aiff</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-5" href="#Options-5">4.3.1 Options</a></li>
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</ul></li>
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<li><a id="toc-alp-1" href="#alp-1">4.4 alp</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-6" href="#Options-6">4.4.1 Options</a></li>
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</ul></li>
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<li><a id="toc-asf-2" href="#asf-2">4.5 asf</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-7" href="#Options-7">4.5.1 Options</a></li>
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</ul></li>
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<li><a id="toc-avi-1" href="#avi-1">4.6 avi</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-8" href="#Options-8">4.6.1 Options</a></li>
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</ul></li>
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<li><a id="toc-chromaprint-1" href="#chromaprint-1">4.7 chromaprint</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-9" href="#Options-9">4.7.1 Options</a></li>
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</ul></li>
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<li><a id="toc-crc-1" href="#crc-1">4.8 crc</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-2" href="#Examples-2">4.8.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-dash-2" href="#dash-2">4.9 dash</a></li>
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<li><a id="toc-fifo-1" href="#fifo-1">4.10 fifo</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-3" href="#Examples-3">4.10.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-flv" href="#flv">4.11 flv</a></li>
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<li><a id="toc-framecrc-1" href="#framecrc-1">4.12 framecrc</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-4" href="#Examples-4">4.12.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-framehash-1" href="#framehash-1">4.13 framehash</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-5" href="#Examples-5">4.13.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-framemd5-1" href="#framemd5-1">4.14 framemd5</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-6" href="#Examples-6">4.14.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-gif-2" href="#gif-2">4.15 gif</a></li>
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<li><a id="toc-hash-1" href="#hash-1">4.16 hash</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-7" href="#Examples-7">4.16.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-hls-2" href="#hls-2">4.17 hls</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-10" href="#Options-10">4.17.1 Options</a></li>
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</ul></li>
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<li><a id="toc-ico-1" href="#ico-1">4.18 ico</a></li>
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<li><a id="toc-image2-2" href="#image2-2">4.19 image2</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-11" href="#Options-11">4.19.1 Options</a></li>
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<li><a id="toc-Examples-8" href="#Examples-8">4.19.2 Examples</a></li>
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</ul></li>
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<li><a id="toc-matroska" href="#matroska">4.20 matroska</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Metadata" href="#Metadata">4.20.1 Metadata</a></li>
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<li><a id="toc-Options-12" href="#Options-12">4.20.2 Options</a></li>
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</ul></li>
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<li><a id="toc-md5-1" href="#md5-1">4.21 md5</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-9" href="#Examples-9">4.21.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-mov_002c-mp4_002c-ismv" href="#mov_002c-mp4_002c-ismv">4.22 mov, mp4, ismv</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-13" href="#Options-13">4.22.1 Options</a></li>
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<li><a id="toc-Example" href="#Example">4.22.2 Example</a></li>
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</ul></li>
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<li><a id="toc-mp3" href="#mp3">4.23 mp3</a></li>
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<li><a id="toc-mpegts-1" href="#mpegts-1">4.24 mpegts</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-14" href="#Options-14">4.24.1 Options</a></li>
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<li><a id="toc-Example-1" href="#Example-1">4.24.2 Example</a></li>
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</ul></li>
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<li><a id="toc-mxf_002c-mxf_005fd10_002c-mxf_005fopatom" href="#mxf_002c-mxf_005fd10_002c-mxf_005fopatom">4.25 mxf, mxf_d10, mxf_opatom</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-15" href="#Options-15">4.25.1 Options</a></li>
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</ul></li>
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<li><a id="toc-null" href="#null">4.26 null</a></li>
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<li><a id="toc-nut" href="#nut">4.27 nut</a></li>
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<li><a id="toc-ogg" href="#ogg">4.28 ogg</a></li>
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<li><a id="toc-raw-muxers-1" href="#raw-muxers-1">4.29 raw muxers</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-ac3" href="#ac3">4.29.1 ac3</a></li>
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<li><a id="toc-adx" href="#adx">4.29.2 adx</a></li>
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<li><a id="toc-aptx" href="#aptx">4.29.3 aptx</a></li>
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<li><a id="toc-aptx_005fhd" href="#aptx_005fhd">4.29.4 aptx_hd</a></li>
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<li><a id="toc-avs2" href="#avs2">4.29.5 avs2</a></li>
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<li><a id="toc-cavsvideo" href="#cavsvideo">4.29.6 cavsvideo</a></li>
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<li><a id="toc-codec2raw" href="#codec2raw">4.29.7 codec2raw</a></li>
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<li><a id="toc-data" href="#data">4.29.8 data</a></li>
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<li><a id="toc-dirac" href="#dirac">4.29.9 dirac</a></li>
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<li><a id="toc-dnxhd" href="#dnxhd">4.29.10 dnxhd</a></li>
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<li><a id="toc-dts" href="#dts">4.29.11 dts</a></li>
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<li><a id="toc-eac3" href="#eac3">4.29.12 eac3</a></li>
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<li><a id="toc-g722" href="#g722">4.29.13 g722</a></li>
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<li><a id="toc-g723_005f1" href="#g723_005f1">4.29.14 g723_1</a></li>
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<li><a id="toc-g726" href="#g726">4.29.15 g726</a></li>
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<li><a id="toc-g726le" href="#g726le">4.29.16 g726le</a></li>
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<li><a id="toc-gsm" href="#gsm">4.29.17 gsm</a></li>
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<li><a id="toc-h261" href="#h261">4.29.18 h261</a></li>
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<li><a id="toc-h263" href="#h263">4.29.19 h263</a></li>
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<li><a id="toc-h264" href="#h264">4.29.20 h264</a></li>
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<li><a id="toc-hevc" href="#hevc">4.29.21 hevc</a></li>
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<li><a id="toc-m4v" href="#m4v">4.29.22 m4v</a></li>
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<li><a id="toc-mjpeg" href="#mjpeg">4.29.23 mjpeg</a></li>
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<li><a id="toc-mlp" href="#mlp">4.29.24 mlp</a></li>
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<li><a id="toc-mp2" href="#mp2">4.29.25 mp2</a></li>
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<li><a id="toc-mpeg1video" href="#mpeg1video">4.29.26 mpeg1video</a></li>
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<li><a id="toc-mpeg2video" href="#mpeg2video">4.29.27 mpeg2video</a></li>
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<li><a id="toc-obu" href="#obu">4.29.28 obu</a></li>
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<li><a id="toc-rawvideo-1" href="#rawvideo-1">4.29.29 rawvideo</a></li>
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<li><a id="toc-sbc" href="#sbc">4.29.30 sbc</a></li>
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<li><a id="toc-truehd" href="#truehd">4.29.31 truehd</a></li>
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<li><a id="toc-vc1" href="#vc1">4.29.32 vc1</a></li>
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</ul></li>
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<li><a id="toc-segment_002c-stream_005fsegment_002c-ssegment" href="#segment_002c-stream_005fsegment_002c-ssegment">4.30 segment, stream_segment, ssegment</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-16" href="#Options-16">4.30.1 Options</a></li>
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<li><a id="toc-Examples-10" href="#Examples-10">4.30.2 Examples</a></li>
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</ul></li>
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<li><a id="toc-smoothstreaming" href="#smoothstreaming">4.31 smoothstreaming</a></li>
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<li><a id="toc-streamhash-1" href="#streamhash-1">4.32 streamhash</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Examples-11" href="#Examples-11">4.32.1 Examples</a></li>
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</ul></li>
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<li><a id="toc-tee-1" href="#tee-1">4.33 tee</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-17" href="#Options-17">4.33.1 Options</a></li>
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<li><a id="toc-Examples-12" href="#Examples-12">4.33.2 Examples</a></li>
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</ul></li>
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<li><a id="toc-webm_005fchunk" href="#webm_005fchunk">4.34 webm_chunk</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-18" href="#Options-18">4.34.1 Options</a></li>
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<li><a id="toc-Example-2" href="#Example-2">4.34.2 Example</a></li>
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</ul></li>
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<li><a id="toc-webm_005fdash_005fmanifest" href="#webm_005fdash_005fmanifest">4.35 webm_dash_manifest</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Options-19" href="#Options-19">4.35.1 Options</a></li>
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<li><a id="toc-Example-3" href="#Example-3">4.35.2 Example</a></li>
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</ul></li>
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</ul></li>
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<li><a id="toc-Metadata-1" href="#Metadata-1">5 Metadata</a></li>
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<li><a id="toc-See-Also" href="#See-Also">6 See Also</a></li>
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<li><a id="toc-Authors" href="#Authors">7 Authors</a></li>
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</ul>
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</div>
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</div>
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<div class="chapter-level-extent" id="Description">
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<h2 class="chapter">1 Description</h2>
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<p>This document describes the supported formats (muxers and demuxers)
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provided by the libavformat library.
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</p>
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</div>
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<div class="chapter-level-extent" id="Format-Options">
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<h2 class="chapter">2 Format Options</h2>
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<p>The libavformat library provides some generic global options, which
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can be set on all the muxers and demuxers. In addition each muxer or
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demuxer may support so-called private options, which are specific for
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that component.
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</p>
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<p>Options may be set by specifying -<var class="var">option</var> <var class="var">value</var> in the
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FFmpeg tools, or by setting the value explicitly in the
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<code class="code">AVFormatContext</code> options or using the <samp class="file">libavutil/opt.h</samp> API
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for programmatic use.
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</p>
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<p>The list of supported options follows:
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</p>
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<dl class="table">
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<dt><samp class="option">avioflags <var class="var">flags</var> (<em class="emph">input/output</em>)</samp></dt>
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<dd><p>Possible values:
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</p><dl class="table">
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<dt>‘<samp class="samp">direct</samp>’</dt>
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<dd><p>Reduce buffering.
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</p></dd>
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</dl>
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</dd>
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<dt><samp class="option">probesize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
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<dd><p>Set probing size in bytes, i.e. the size of the data to analyze to get
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stream information. A higher value will enable detecting more
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information in case it is dispersed into the stream, but will increase
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latency. Must be an integer not lesser than 32. It is 5000000 by default.
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</p>
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</dd>
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<dt><samp class="option">max_probe_packets <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
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<dd><p>Set the maximum number of buffered packets when probing a codec.
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Default is 2500 packets.
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</p>
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</dd>
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<dt><samp class="option">packetsize <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
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<dd><p>Set packet size.
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</p>
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</dd>
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<dt><samp class="option">fflags <var class="var">flags</var></samp></dt>
|
|
<dd><p>Set format flags. Some are implemented for a limited number of formats.
|
|
</p>
|
|
<p>Possible values for input files:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">discardcorrupt</samp>’</dt>
|
|
<dd><p>Discard corrupted packets.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">fastseek</samp>’</dt>
|
|
<dd><p>Enable fast, but inaccurate seeks for some formats.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">genpts</samp>’</dt>
|
|
<dd><p>Generate missing PTS if DTS is present.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">igndts</samp>’</dt>
|
|
<dd><p>Ignore DTS if PTS is set. Inert when nofillin is set.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">ignidx</samp>’</dt>
|
|
<dd><p>Ignore index.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">nobuffer</samp>’</dt>
|
|
<dd><p>Reduce the latency introduced by buffering during initial input streams analysis.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">nofillin</samp>’</dt>
|
|
<dd><p>Do not fill in missing values in packet fields that can be exactly calculated.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">noparse</samp>’</dt>
|
|
<dd><p>Disable AVParsers, this needs <code class="code">+nofillin</code> too.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">sortdts</samp>’</dt>
|
|
<dd><p>Try to interleave output packets by DTS. At present, available only for AVIs with an index.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>Possible values for output files:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">autobsf</samp>’</dt>
|
|
<dd><p>Automatically apply bitstream filters as required by the output format. Enabled by default.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">bitexact</samp>’</dt>
|
|
<dd><p>Only write platform-, build- and time-independent data.
|
|
This ensures that file and data checksums are reproducible and match between
|
|
platforms. Its primary use is for regression testing.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">flush_packets</samp>’</dt>
|
|
<dd><p>Write out packets immediately.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">shortest</samp>’</dt>
|
|
<dd><p>Stop muxing at the end of the shortest stream.
|
|
It may be needed to increase max_interleave_delta to avoid flushing the longer
|
|
streams before EOF.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">seek2any <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Allow seeking to non-keyframes on demuxer level when supported if set to 1.
|
|
Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">analyzeduration <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Specify how many microseconds are analyzed to probe the input. A
|
|
higher value will enable detecting more accurate information, but will
|
|
increase latency. It defaults to 5,000,000 microseconds = 5 seconds.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">cryptokey <var class="var">hexadecimal string</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Set decryption key.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">indexmem <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Set max memory used for timestamp index (per stream).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">rtbufsize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Set max memory used for buffering real-time frames.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">fdebug <var class="var">flags</var> (<em class="emph">input/output</em>)</samp></dt>
|
|
<dd><p>Print specific debug info.
|
|
</p>
|
|
<p>Possible values:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">ts</samp>’</dt>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">max_delay <var class="var">integer</var> (<em class="emph">input/output</em>)</samp></dt>
|
|
<dd><p>Set maximum muxing or demuxing delay in microseconds.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">fpsprobesize <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Set number of frames used to probe fps.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">audio_preload <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd><p>Set microseconds by which audio packets should be interleaved earlier.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">chunk_duration <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd><p>Set microseconds for each chunk.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">chunk_size <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd><p>Set size in bytes for each chunk.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">err_detect, f_err_detect <var class="var">flags</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Set error detection flags. <code class="code">f_err_detect</code> is deprecated and
|
|
should be used only via the <code class="command">ffmpeg</code> tool.
|
|
</p>
|
|
<p>Possible values:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">crccheck</samp>’</dt>
|
|
<dd><p>Verify embedded CRCs.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">bitstream</samp>’</dt>
|
|
<dd><p>Detect bitstream specification deviations.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">buffer</samp>’</dt>
|
|
<dd><p>Detect improper bitstream length.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">explode</samp>’</dt>
|
|
<dd><p>Abort decoding on minor error detection.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">careful</samp>’</dt>
|
|
<dd><p>Consider things that violate the spec and have not been seen in the
|
|
wild as errors.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">compliant</samp>’</dt>
|
|
<dd><p>Consider all spec non compliancies as errors.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">aggressive</samp>’</dt>
|
|
<dd><p>Consider things that a sane encoder should not do as an error.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">max_interleave_delta <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd><p>Set maximum buffering duration for interleaving. The duration is
|
|
expressed in microseconds, and defaults to 10000000 (10 seconds).
|
|
</p>
|
|
<p>To ensure all the streams are interleaved correctly, libavformat will
|
|
wait until it has at least one packet for each stream before actually
|
|
writing any packets to the output file. When some streams are
|
|
"sparse" (i.e. there are large gaps between successive packets), this
|
|
can result in excessive buffering.
|
|
</p>
|
|
<p>This field specifies the maximum difference between the timestamps of the
|
|
first and the last packet in the muxing queue, above which libavformat
|
|
will output a packet regardless of whether it has queued a packet for all
|
|
the streams.
|
|
</p>
|
|
<p>If set to 0, libavformat will continue buffering packets until it has
|
|
a packet for each stream, regardless of the maximum timestamp
|
|
difference between the buffered packets.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">use_wallclock_as_timestamps <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Use wallclock as timestamps if set to 1. Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">avoid_negative_ts <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd>
|
|
<p>Possible values:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">make_non_negative</samp>’</dt>
|
|
<dd><p>Shift timestamps to make them non-negative.
|
|
Also note that this affects only leading negative timestamps, and not
|
|
non-monotonic negative timestamps.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">make_zero</samp>’</dt>
|
|
<dd><p>Shift timestamps so that the first timestamp is 0.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">auto (default)</samp>’</dt>
|
|
<dd><p>Enables shifting when required by the target format.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">disabled</samp>’</dt>
|
|
<dd><p>Disables shifting of timestamp.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>When shifting is enabled, all output timestamps are shifted by the
|
|
same amount. Audio, video, and subtitles desynching and relative
|
|
timestamp differences are preserved compared to how they would have
|
|
been without shifting.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">skip_initial_bytes <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Set number of bytes to skip before reading header and frames if set to 1.
|
|
Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">correct_ts_overflow <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Correct single timestamp overflows if set to 1. Default is 1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">flush_packets <var class="var">integer</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd><p>Flush the underlying I/O stream after each packet. Default is -1 (auto), which
|
|
means that the underlying protocol will decide, 1 enables it, and has the
|
|
effect of reducing the latency, 0 disables it and may increase IO throughput in
|
|
some cases.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">output_ts_offset <var class="var">offset</var> (<em class="emph">output</em>)</samp></dt>
|
|
<dd><p>Set the output time offset.
|
|
</p>
|
|
<p><var class="var">offset</var> must be a time duration specification,
|
|
see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">(ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual</a>.
|
|
</p>
|
|
<p>The offset is added by the muxer to the output timestamps.
|
|
</p>
|
|
<p>Specifying a positive offset means that the corresponding streams are
|
|
delayed bt the time duration specified in <var class="var">offset</var>. Default value
|
|
is <code class="code">0</code> (meaning that no offset is applied).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">format_whitelist <var class="var">list</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>"," separated list of allowed demuxers. By default all are allowed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">dump_separator <var class="var">string</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Separator used to separate the fields printed on the command line about the
|
|
Stream parameters.
|
|
For example, to separate the fields with newlines and indentation:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffprobe -dump_separator "
|
|
" -i ~/videos/matrixbench_mpeg2.mpg
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp class="option">max_streams <var class="var">integer</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Specifies the maximum number of streams. This can be used to reject files that
|
|
would require too many resources due to a large number of streams.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">skip_estimate_duration_from_pts <var class="var">bool</var> (<em class="emph">input</em>)</samp></dt>
|
|
<dd><p>Skip estimation of input duration when calculated using PTS.
|
|
At present, applicable for MPEG-PS and MPEG-TS.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">strict, f_strict <var class="var">integer</var> (<em class="emph">input/output</em>)</samp></dt>
|
|
<dd><p>Specify how strictly to follow the standards. <code class="code">f_strict</code> is deprecated and
|
|
should be used only via the <code class="command">ffmpeg</code> tool.
|
|
</p>
|
|
<p>Possible values:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">very</samp>’</dt>
|
|
<dd><p>strictly conform to an older more strict version of the spec or reference software
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">strict</samp>’</dt>
|
|
<dd><p>strictly conform to all the things in the spec no matter what consequences
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">normal</samp>’</dt>
|
|
<dt>‘<samp class="samp">unofficial</samp>’</dt>
|
|
<dd><p>allow unofficial extensions
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">experimental</samp>’</dt>
|
|
<dd><p>allow non standardized experimental things, experimental
|
|
(unfinished/work in progress/not well tested) decoders and encoders.
|
|
Note: experimental decoders can pose a security risk, do not use this for
|
|
decoding untrusted input.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
</dl>
|
|
|
|
|
|
<a class="anchor" id="Format-stream-specifiers"></a><ul class="mini-toc">
|
|
<li><a href="#Format-stream-specifiers-1" accesskey="1">Format stream specifiers</a></li>
|
|
</ul>
|
|
<div class="section-level-extent" id="Format-stream-specifiers-1">
|
|
<h3 class="section">2.1 Format stream specifiers</h3>
|
|
|
|
<p>Format stream specifiers allow selection of one or more streams that
|
|
match specific properties.
|
|
</p>
|
|
<p>The exact semantics of stream specifiers is defined by the
|
|
<code class="code">avformat_match_stream_specifier()</code> function declared in the
|
|
<samp class="file">libavformat/avformat.h</samp> header and documented in the
|
|
<a data-manual="ffmpeg" href="ffmpeg.html#Stream-specifiers">(ffmpeg)Stream specifiers section in the ffmpeg(1) manual</a>.
|
|
</p>
|
|
</div>
|
|
</div>
|
|
<div class="chapter-level-extent" id="Demuxers">
|
|
<h2 class="chapter">3 Demuxers</h2>
|
|
|
|
<p>Demuxers are configured elements in FFmpeg that can read the
|
|
multimedia streams from a particular type of file.
|
|
</p>
|
|
<p>When you configure your FFmpeg build, all the supported demuxers
|
|
are enabled by default. You can list all available ones using the
|
|
configure option <code class="code">--list-demuxers</code>.
|
|
</p>
|
|
<p>You can disable all the demuxers using the configure option
|
|
<code class="code">--disable-demuxers</code>, and selectively enable a single demuxer with
|
|
the option <code class="code">--enable-demuxer=<var class="var">DEMUXER</var></code>, or disable it
|
|
with the option <code class="code">--disable-demuxer=<var class="var">DEMUXER</var></code>.
|
|
</p>
|
|
<p>The option <code class="code">-demuxers</code> of the ff* tools will display the list of
|
|
enabled demuxers. Use <code class="code">-formats</code> to view a combined list of
|
|
enabled demuxers and muxers.
|
|
</p>
|
|
<p>The description of some of the currently available demuxers follows.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#aa" accesskey="1">aa</a></li>
|
|
<li><a href="#aac" accesskey="2">aac</a></li>
|
|
<li><a href="#apng" accesskey="3">apng</a></li>
|
|
<li><a href="#asf-1" accesskey="4">asf</a></li>
|
|
<li><a href="#concat-1" accesskey="5">concat</a></li>
|
|
<li><a href="#dash-1" accesskey="6">dash</a></li>
|
|
<li><a href="#ea" accesskey="7">ea</a></li>
|
|
<li><a href="#imf" accesskey="8">imf</a></li>
|
|
<li><a href="#flv_002c-live_005fflv_002c-kux" accesskey="9">flv, live_flv, kux</a></li>
|
|
<li><a href="#gif-1">gif</a></li>
|
|
<li><a href="#hls-1">hls</a></li>
|
|
<li><a href="#image2-1">image2</a></li>
|
|
<li><a href="#libgme">libgme</a></li>
|
|
<li><a href="#libmodplug">libmodplug</a></li>
|
|
<li><a href="#libopenmpt">libopenmpt</a></li>
|
|
<li><a href="#mov_002fmp4_002f3gp">mov/mp4/3gp</a></li>
|
|
<li><a href="#mpegts">mpegts</a></li>
|
|
<li><a href="#mpjpeg">mpjpeg</a></li>
|
|
<li><a href="#rawvideo">rawvideo</a></li>
|
|
<li><a href="#sbg">sbg</a></li>
|
|
<li><a href="#tedcaptions">tedcaptions</a></li>
|
|
<li><a href="#vapoursynth">vapoursynth</a></li>
|
|
</ul>
|
|
<div class="section-level-extent" id="aa">
|
|
<h3 class="section">3.1 aa</h3>
|
|
|
|
<p>Audible Format 2, 3, and 4 demuxer.
|
|
</p>
|
|
<p>This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
|
|
</p>
|
|
</div>
|
|
<div class="section-level-extent" id="aac">
|
|
<h3 class="section">3.2 aac</h3>
|
|
|
|
<p>Raw Audio Data Transport Stream AAC demuxer.
|
|
</p>
|
|
<p>This demuxer is used to demux an ADTS input containing a single AAC stream
|
|
alongwith any ID3v1/2 or APE tags in it.
|
|
</p>
|
|
</div>
|
|
<div class="section-level-extent" id="apng">
|
|
<h3 class="section">3.3 apng</h3>
|
|
|
|
<p>Animated Portable Network Graphics demuxer.
|
|
</p>
|
|
<p>This demuxer is used to demux APNG files.
|
|
All headers, but the PNG signature, up to (but not including) the first
|
|
fcTL chunk are transmitted as extradata.
|
|
Frames are then split as being all the chunks between two fcTL ones, or
|
|
between the last fcTL and IEND chunks.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">-ignore_loop <var class="var">bool</var></samp></dt>
|
|
<dd><p>Ignore the loop variable in the file if set. Default is enabled.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-max_fps <var class="var">int</var></samp></dt>
|
|
<dd><p>Maximum framerate in frames per second. Default of 0 imposes no limit.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-default_fps <var class="var">int</var></samp></dt>
|
|
<dd><p>Default framerate in frames per second when none is specified in the file
|
|
(0 meaning as fast as possible). Default is 15.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="asf-1">
|
|
<h3 class="section">3.4 asf</h3>
|
|
|
|
<p>Advanced Systems Format demuxer.
|
|
</p>
|
|
<p>This demuxer is used to demux ASF files and MMS network streams.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">-no_resync_search <var class="var">bool</var></samp></dt>
|
|
<dd><p>Do not try to resynchronize by looking for a certain optional start code.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="concat"></a></div>
|
|
<div class="section-level-extent" id="concat-1">
|
|
<h3 class="section">3.5 concat</h3>
|
|
|
|
<p>Virtual concatenation script demuxer.
|
|
</p>
|
|
<p>This demuxer reads a list of files and other directives from a text file and
|
|
demuxes them one after the other, as if all their packets had been muxed
|
|
together.
|
|
</p>
|
|
<p>The timestamps in the files are adjusted so that the first file starts at 0
|
|
and each next file starts where the previous one finishes. Note that it is
|
|
done globally and may cause gaps if all streams do not have exactly the same
|
|
length.
|
|
</p>
|
|
<p>All files must have the same streams (same codecs, same time base, etc.).
|
|
</p>
|
|
<p>The duration of each file is used to adjust the timestamps of the next file:
|
|
if the duration is incorrect (because it was computed using the bit-rate or
|
|
because the file is truncated, for example), it can cause artifacts. The
|
|
<code class="code">duration</code> directive can be used to override the duration stored in
|
|
each file.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Syntax" accesskey="1">Syntax</a></li>
|
|
<li><a href="#Options" accesskey="2">Options</a></li>
|
|
<li><a href="#Examples" accesskey="3">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Syntax">
|
|
<h4 class="subsection">3.5.1 Syntax</h4>
|
|
|
|
<p>The script is a text file in extended-ASCII, with one directive per line.
|
|
Empty lines, leading spaces and lines starting with ’#’ are ignored. The
|
|
following directive is recognized:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option"><code class="code">file <var class="var">path</var></code></samp></dt>
|
|
<dd><p>Path to a file to read; special characters and spaces must be escaped with
|
|
backslash or single quotes.
|
|
</p>
|
|
<p>All subsequent file-related directives apply to that file.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">ffconcat version 1.0</code></samp></dt>
|
|
<dd><p>Identify the script type and version.
|
|
</p>
|
|
<p>To make FFmpeg recognize the format automatically, this directive must
|
|
appear exactly as is (no extra space or byte-order-mark) on the very first
|
|
line of the script.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">duration <var class="var">dur</var></code></samp></dt>
|
|
<dd><p>Duration of the file. This information can be specified from the file;
|
|
specifying it here may be more efficient or help if the information from the
|
|
file is not available or accurate.
|
|
</p>
|
|
<p>If the duration is set for all files, then it is possible to seek in the
|
|
whole concatenated video.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">inpoint <var class="var">timestamp</var></code></samp></dt>
|
|
<dd><p>In point of the file. When the demuxer opens the file it instantly seeks to the
|
|
specified timestamp. Seeking is done so that all streams can be presented
|
|
successfully at In point.
|
|
</p>
|
|
<p>This directive works best with intra frame codecs, because for non-intra frame
|
|
ones you will usually get extra packets before the actual In point and the
|
|
decoded content will most likely contain frames before In point too.
|
|
</p>
|
|
<p>For each file, packets before the file In point will have timestamps less than
|
|
the calculated start timestamp of the file (negative in case of the first
|
|
file), and the duration of the files (if not specified by the <code class="code">duration</code>
|
|
directive) will be reduced based on their specified In point.
|
|
</p>
|
|
<p>Because of potential packets before the specified In point, packet timestamps
|
|
may overlap between two concatenated files.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">outpoint <var class="var">timestamp</var></code></samp></dt>
|
|
<dd><p>Out point of the file. When the demuxer reaches the specified decoding
|
|
timestamp in any of the streams, it handles it as an end of file condition and
|
|
skips the current and all the remaining packets from all streams.
|
|
</p>
|
|
<p>Out point is exclusive, which means that the demuxer will not output packets
|
|
with a decoding timestamp greater or equal to Out point.
|
|
</p>
|
|
<p>This directive works best with intra frame codecs and formats where all streams
|
|
are tightly interleaved. For non-intra frame codecs you will usually get
|
|
additional packets with presentation timestamp after Out point therefore the
|
|
decoded content will most likely contain frames after Out point too. If your
|
|
streams are not tightly interleaved you may not get all the packets from all
|
|
streams before Out point and you may only will be able to decode the earliest
|
|
stream until Out point.
|
|
</p>
|
|
<p>The duration of the files (if not specified by the <code class="code">duration</code>
|
|
directive) will be reduced based on their specified Out point.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">file_packet_metadata <var class="var">key=value</var></code></samp></dt>
|
|
<dd><p>Metadata of the packets of the file. The specified metadata will be set for
|
|
each file packet. You can specify this directive multiple times to add multiple
|
|
metadata entries.
|
|
This directive is deprecated, use <code class="code">file_packet_meta</code> instead.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">file_packet_meta <var class="var">key</var> <var class="var">value</var></code></samp></dt>
|
|
<dd><p>Metadata of the packets of the file. The specified metadata will be set for
|
|
each file packet. You can specify this directive multiple times to add multiple
|
|
metadata entries.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">option <var class="var">key</var> <var class="var">value</var></code></samp></dt>
|
|
<dd><p>Option to access, open and probe the file.
|
|
Can be present multiple times.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">stream</code></samp></dt>
|
|
<dd><p>Introduce a stream in the virtual file.
|
|
All subsequent stream-related directives apply to the last introduced
|
|
stream.
|
|
Some streams properties must be set in order to allow identifying the
|
|
matching streams in the subfiles.
|
|
If no streams are defined in the script, the streams from the first file are
|
|
copied.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">exact_stream_id <var class="var">id</var></code></samp></dt>
|
|
<dd><p>Set the id of the stream.
|
|
If this directive is given, the string with the corresponding id in the
|
|
subfiles will be used.
|
|
This is especially useful for MPEG-PS (VOB) files, where the order of the
|
|
streams is not reliable.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">stream_meta <var class="var">key</var> <var class="var">value</var></code></samp></dt>
|
|
<dd><p>Metadata for the stream.
|
|
Can be present multiple times.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">stream_codec <var class="var">value</var></code></samp></dt>
|
|
<dd><p>Codec for the stream.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">stream_extradata <var class="var">hex_string</var></code></samp></dt>
|
|
<dd><p>Extradata for the string, encoded in hexadecimal.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option"><code class="code">chapter <var class="var">id</var> <var class="var">start</var> <var class="var">end</var></code></samp></dt>
|
|
<dd><p>Add a chapter. <var class="var">id</var> is an unique identifier, possibly small and
|
|
consecutive.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Options">
|
|
<h4 class="subsection">3.5.2 Options</h4>
|
|
|
|
<p>This demuxer accepts the following option:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">safe</samp></dt>
|
|
<dd><p>If set to 1, reject unsafe file paths and directives.
|
|
A file path is considered safe if it
|
|
does not contain a protocol specification and is relative and all components
|
|
only contain characters from the portable character set (letters, digits,
|
|
period, underscore and hyphen) and have no period at the beginning of a
|
|
component.
|
|
</p>
|
|
<p>If set to 0, any file name is accepted.
|
|
</p>
|
|
<p>The default is 1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">auto_convert</samp></dt>
|
|
<dd><p>If set to 1, try to perform automatic conversions on packet data to make the
|
|
streams concatenable.
|
|
The default is 1.
|
|
</p>
|
|
<p>Currently, the only conversion is adding the h264_mp4toannexb bitstream
|
|
filter to H.264 streams in MP4 format. This is necessary in particular if
|
|
there are resolution changes.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_time_metadata</samp></dt>
|
|
<dd><p>If set to 1, every packet will contain the <var class="var">lavf.concat.start_time</var> and the
|
|
<var class="var">lavf.concat.duration</var> packet metadata values which are the start_time and
|
|
the duration of the respective file segments in the concatenated output
|
|
expressed in microseconds. The duration metadata is only set if it is known
|
|
based on the concat file.
|
|
The default is 0.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Examples">
|
|
<h4 class="subsection">3.5.3 Examples</h4>
|
|
|
|
<ul class="itemize mark-bullet">
|
|
<li>Use absolute filenames and include some comments:
|
|
<div class="example">
|
|
<pre class="example-preformatted"># my first filename
|
|
file /mnt/share/file-1.wav
|
|
# my second filename including whitespace
|
|
file '/mnt/share/file 2.wav'
|
|
# my third filename including whitespace plus single quote
|
|
file '/mnt/share/file 3'\''.wav'
|
|
</pre></div>
|
|
|
|
</li><li>Allow for input format auto-probing, use safe filenames and set the duration of
|
|
the first file:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffconcat version 1.0
|
|
|
|
file file-1.wav
|
|
duration 20.0
|
|
|
|
file subdir/file-2.wav
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="dash-1">
|
|
<h3 class="section">3.6 dash</h3>
|
|
|
|
<p>Dynamic Adaptive Streaming over HTTP demuxer.
|
|
</p>
|
|
<p>This demuxer presents all AVStreams found in the manifest.
|
|
By setting the discard flags on AVStreams the caller can decide
|
|
which streams to actually receive.
|
|
Each stream mirrors the <code class="code">id</code> and <code class="code">bandwidth</code> properties from the
|
|
<code class="code"><Representation></code> as metadata keys named "id" and "variant_bitrate" respectively.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-1" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-1">
|
|
<h4 class="subsection">3.6.1 Options</h4>
|
|
|
|
<p>This demuxer accepts the following option:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">cenc_decryption_key</samp></dt>
|
|
<dd><p>16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="ea">
|
|
<h3 class="section">3.7 ea</h3>
|
|
|
|
<p>Electronic Arts Multimedia format demuxer.
|
|
</p>
|
|
<p>This format is used by various Electronic Arts games.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-2" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-2">
|
|
<h4 class="subsection">3.7.1 Options</h4>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">merge_alpha <var class="var">bool</var></samp></dt>
|
|
<dd>
|
|
<p>Normally the VP6 alpha channel (if exists) is returned as a secondary video
|
|
stream, by setting this option you can make the demuxer return a single video
|
|
stream which contains the alpha channel in addition to the ordinary video.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="imf">
|
|
<h3 class="section">3.8 imf</h3>
|
|
|
|
<p>Interoperable Master Format demuxer.
|
|
</p>
|
|
<p>This demuxer presents audio and video streams found in an IMF Composition, as
|
|
specified in <a class="url" href="https://doi.org/10.5594/SMPTE.ST2067-2.2020">SMPTE ST 2067-2</a>.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg [-assetmaps <path of ASSETMAP1>,<path of ASSETMAP2>,...] -i <path of CPL> ...
|
|
</pre></div>
|
|
|
|
<p>If <code class="code">-assetmaps</code> is not specified, the demuxer looks for a file called
|
|
<samp class="file">ASSETMAP.xml</samp> in the same directory as the CPL.
|
|
</p>
|
|
</div>
|
|
<div class="section-level-extent" id="flv_002c-live_005fflv_002c-kux">
|
|
<h3 class="section">3.9 flv, live_flv, kux</h3>
|
|
|
|
<p>Adobe Flash Video Format demuxer.
|
|
</p>
|
|
<p>This demuxer is used to demux FLV files and RTMP network streams. In case of live network streams, if you force format, you may use live_flv option instead of flv to survive timestamp discontinuities.
|
|
KUX is a flv variant used on the Youku platform.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -f flv -i myfile.flv ...
|
|
ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....
|
|
</pre></div>
|
|
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">-flv_metadata <var class="var">bool</var></samp></dt>
|
|
<dd><p>Allocate the streams according to the onMetaData array content.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-flv_ignore_prevtag <var class="var">bool</var></samp></dt>
|
|
<dd><p>Ignore the size of previous tag value.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-flv_full_metadata <var class="var">bool</var></samp></dt>
|
|
<dd><p>Output all context of the onMetadata.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="gif-1">
|
|
<h3 class="section">3.10 gif</h3>
|
|
|
|
<p>Animated GIF demuxer.
|
|
</p>
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">min_delay</samp></dt>
|
|
<dd><p>Set the minimum valid delay between frames in hundredths of seconds.
|
|
Range is 0 to 6000. Default value is 2.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_gif_delay</samp></dt>
|
|
<dd><p>Set the maximum valid delay between frames in hundredth of seconds.
|
|
Range is 0 to 65535. Default value is 65535 (nearly eleven minutes),
|
|
the maximum value allowed by the specification.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">default_delay</samp></dt>
|
|
<dd><p>Set the default delay between frames in hundredths of seconds.
|
|
Range is 0 to 6000. Default value is 10.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">ignore_loop</samp></dt>
|
|
<dd><p>GIF files can contain information to loop a certain number of times (or
|
|
infinitely). If <samp class="option">ignore_loop</samp> is set to 1, then the loop setting
|
|
from the input will be ignored and looping will not occur. If set to 0,
|
|
then looping will occur and will cycle the number of times according to
|
|
the GIF. Default value is 1.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>For example, with the overlay filter, place an infinitely looping GIF
|
|
over another video:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
|
|
</pre></div>
|
|
|
|
<p>Note that in the above example the shortest option for overlay filter is
|
|
used to end the output video at the length of the shortest input file,
|
|
which in this case is <samp class="file">input.mp4</samp> as the GIF in this example loops
|
|
infinitely.
|
|
</p>
|
|
</div>
|
|
<div class="section-level-extent" id="hls-1">
|
|
<h3 class="section">3.11 hls</h3>
|
|
|
|
<p>HLS demuxer
|
|
</p>
|
|
<p>Apple HTTP Live Streaming demuxer.
|
|
</p>
|
|
<p>This demuxer presents all AVStreams from all variant streams.
|
|
The id field is set to the bitrate variant index number. By setting
|
|
the discard flags on AVStreams (by pressing ’a’ or ’v’ in ffplay),
|
|
the caller can decide which variant streams to actually receive.
|
|
The total bitrate of the variant that the stream belongs to is
|
|
available in a metadata key named "variant_bitrate".
|
|
</p>
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">live_start_index</samp></dt>
|
|
<dd><p>segment index to start live streams at (negative values are from the end).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">prefer_x_start</samp></dt>
|
|
<dd><p>prefer to use #EXT-X-START if it’s in playlist instead of live_start_index.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">allowed_extensions</samp></dt>
|
|
<dd><p>’,’ separated list of file extensions that hls is allowed to access.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_reload</samp></dt>
|
|
<dd><p>Maximum number of times a insufficient list is attempted to be reloaded.
|
|
Default value is 1000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">m3u8_hold_counters</samp></dt>
|
|
<dd><p>The maximum number of times to load m3u8 when it refreshes without new segments.
|
|
Default value is 1000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">http_persistent</samp></dt>
|
|
<dd><p>Use persistent HTTP connections. Applicable only for HTTP streams.
|
|
Enabled by default.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">http_multiple</samp></dt>
|
|
<dd><p>Use multiple HTTP connections for downloading HTTP segments.
|
|
Enabled by default for HTTP/1.1 servers.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">http_seekable</samp></dt>
|
|
<dd><p>Use HTTP partial requests for downloading HTTP segments.
|
|
0 = disable, 1 = enable, -1 = auto, Default is auto.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">seg_format_options</samp></dt>
|
|
<dd><p>Set options for the demuxer of media segments using a list of key=value pairs separated by <code class="code">:</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">seg_max_retry</samp></dt>
|
|
<dd><p>Maximum number of times to reload a segment on error, useful when segment skip on network error is not desired.
|
|
Default value is 0.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="image2-1">
|
|
<h3 class="section">3.12 image2</h3>
|
|
|
|
<p>Image file demuxer.
|
|
</p>
|
|
<p>This demuxer reads from a list of image files specified by a pattern.
|
|
The syntax and meaning of the pattern is specified by the
|
|
option <var class="var">pattern_type</var>.
|
|
</p>
|
|
<p>The pattern may contain a suffix which is used to automatically
|
|
determine the format of the images contained in the files.
|
|
</p>
|
|
<p>The size, the pixel format, and the format of each image must be the
|
|
same for all the files in the sequence.
|
|
</p>
|
|
<p>This demuxer accepts the following options:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">framerate</samp></dt>
|
|
<dd><p>Set the frame rate for the video stream. It defaults to 25.
|
|
</p></dd>
|
|
<dt><samp class="option">loop</samp></dt>
|
|
<dd><p>If set to 1, loop over the input. Default value is 0.
|
|
</p></dd>
|
|
<dt><samp class="option">pattern_type</samp></dt>
|
|
<dd><p>Select the pattern type used to interpret the provided filename.
|
|
</p>
|
|
<p><var class="var">pattern_type</var> accepts one of the following values.
|
|
</p><dl class="table">
|
|
<dt><samp class="option">none</samp></dt>
|
|
<dd><p>Disable pattern matching, therefore the video will only contain the specified
|
|
image. You should use this option if you do not want to create sequences from
|
|
multiple images and your filenames may contain special pattern characters.
|
|
</p></dd>
|
|
<dt><samp class="option">sequence</samp></dt>
|
|
<dd><p>Select a sequence pattern type, used to specify a sequence of files
|
|
indexed by sequential numbers.
|
|
</p>
|
|
<p>A sequence pattern may contain the string "%d" or "%0<var class="var">N</var>d", which
|
|
specifies the position of the characters representing a sequential
|
|
number in each filename matched by the pattern. If the form
|
|
"%d0<var class="var">N</var>d" is used, the string representing the number in each
|
|
filename is 0-padded and <var class="var">N</var> is the total number of 0-padded
|
|
digits representing the number. The literal character ’%’ can be
|
|
specified in the pattern with the string "%%".
|
|
</p>
|
|
<p>If the sequence pattern contains "%d" or "%0<var class="var">N</var>d", the first filename of
|
|
the file list specified by the pattern must contain a number
|
|
inclusively contained between <var class="var">start_number</var> and
|
|
<var class="var">start_number</var>+<var class="var">start_number_range</var>-1, and all the following
|
|
numbers must be sequential.
|
|
</p>
|
|
<p>For example the pattern "img-%03d.bmp" will match a sequence of
|
|
filenames of the form <samp class="file">img-001.bmp</samp>, <samp class="file">img-002.bmp</samp>, ...,
|
|
<samp class="file">img-010.bmp</samp>, etc.; the pattern "i%%m%%g-%d.jpg" will match a
|
|
sequence of filenames of the form <samp class="file">i%m%g-1.jpg</samp>,
|
|
<samp class="file">i%m%g-2.jpg</samp>, ..., <samp class="file">i%m%g-10.jpg</samp>, etc.
|
|
</p>
|
|
<p>Note that the pattern must not necessarily contain "%d" or
|
|
"%0<var class="var">N</var>d", for example to convert a single image file
|
|
<samp class="file">img.jpeg</samp> you can employ the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i img.jpeg img.png
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp class="option">glob</samp></dt>
|
|
<dd><p>Select a glob wildcard pattern type.
|
|
</p>
|
|
<p>The pattern is interpreted like a <code class="code">glob()</code> pattern. This is only
|
|
selectable if libavformat was compiled with globbing support.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">glob_sequence <em class="emph">(deprecated, will be removed)</em></samp></dt>
|
|
<dd><p>Select a mixed glob wildcard/sequence pattern.
|
|
</p>
|
|
<p>If your version of libavformat was compiled with globbing support, and
|
|
the provided pattern contains at least one glob meta character among
|
|
<code class="code">%*?[]{}</code> that is preceded by an unescaped "%", the pattern is
|
|
interpreted like a <code class="code">glob()</code> pattern, otherwise it is interpreted
|
|
like a sequence pattern.
|
|
</p>
|
|
<p>All glob special characters <code class="code">%*?[]{}</code> must be prefixed
|
|
with "%". To escape a literal "%" you shall use "%%".
|
|
</p>
|
|
<p>For example the pattern <code class="code">foo-%*.jpeg</code> will match all the
|
|
filenames prefixed by "foo-" and terminating with ".jpeg", and
|
|
<code class="code">foo-%?%?%?.jpeg</code> will match all the filenames prefixed with
|
|
"foo-", followed by a sequence of three characters, and terminating
|
|
with ".jpeg".
|
|
</p>
|
|
<p>This pattern type is deprecated in favor of <var class="var">glob</var> and
|
|
<var class="var">sequence</var>.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>Default value is <var class="var">glob_sequence</var>.
|
|
</p></dd>
|
|
<dt><samp class="option">pixel_format</samp></dt>
|
|
<dd><p>Set the pixel format of the images to read. If not specified the pixel
|
|
format is guessed from the first image file in the sequence.
|
|
</p></dd>
|
|
<dt><samp class="option">start_number</samp></dt>
|
|
<dd><p>Set the index of the file matched by the image file pattern to start
|
|
to read from. Default value is 0.
|
|
</p></dd>
|
|
<dt><samp class="option">start_number_range</samp></dt>
|
|
<dd><p>Set the index interval range to check when looking for the first image
|
|
file in the sequence, starting from <var class="var">start_number</var>. Default value
|
|
is 5.
|
|
</p></dd>
|
|
<dt><samp class="option">ts_from_file</samp></dt>
|
|
<dd><p>If set to 1, will set frame timestamp to modification time of image file. Note
|
|
that monotonity of timestamps is not provided: images go in the same order as
|
|
without this option. Default value is 0.
|
|
If set to 2, will set frame timestamp to the modification time of the image file in
|
|
nanosecond precision.
|
|
</p></dd>
|
|
<dt><samp class="option">video_size</samp></dt>
|
|
<dd><p>Set the video size of the images to read. If not specified the video
|
|
size is guessed from the first image file in the sequence.
|
|
</p></dd>
|
|
<dt><samp class="option">export_path_metadata</samp></dt>
|
|
<dd><p>If set to 1, will add two extra fields to the metadata found in input, making them
|
|
also available for other filters (see <var class="var">drawtext</var> filter for examples). Default
|
|
value is 0. The extra fields are described below:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">lavf.image2dec.source_path</samp></dt>
|
|
<dd><p>Corresponds to the full path to the input file being read.
|
|
</p></dd>
|
|
<dt><samp class="option">lavf.image2dec.source_basename</samp></dt>
|
|
<dd><p>Corresponds to the name of the file being read.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
</dl>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-1" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-1">
|
|
<h4 class="subsection">3.12.1 Examples</h4>
|
|
|
|
<ul class="itemize mark-bullet">
|
|
<li>Use <code class="command">ffmpeg</code> for creating a video from the images in the file
|
|
sequence <samp class="file">img-001.jpeg</samp>, <samp class="file">img-002.jpeg</samp>, ..., assuming an
|
|
input frame rate of 10 frames per second:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
|
|
</pre></div>
|
|
|
|
</li><li>As above, but start by reading from a file with index 100 in the sequence:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
|
|
</pre></div>
|
|
|
|
</li><li>Read images matching the "*.png" glob pattern , that is all the files
|
|
terminating with the ".png" suffix:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="libgme">
|
|
<h3 class="section">3.13 libgme</h3>
|
|
|
|
<p>The Game Music Emu library is a collection of video game music file emulators.
|
|
</p>
|
|
<p>See <a class="url" href="https://bitbucket.org/mpyne/game-music-emu/overview">https://bitbucket.org/mpyne/game-music-emu/overview</a> for more information.
|
|
</p>
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">track_index</samp></dt>
|
|
<dd><p>Set the index of which track to demux. The demuxer can only export one track.
|
|
Track indexes start at 0. Default is to pick the first track. Number of tracks
|
|
is exported as <var class="var">tracks</var> metadata entry.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">sample_rate</samp></dt>
|
|
<dd><p>Set the sampling rate of the exported track. Range is 1000 to 999999. Default is 44100.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_size <em class="emph">(bytes)</em></samp></dt>
|
|
<dd><p>The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size,
|
|
which in turn, acts as a ceiling for the size of files that can be read.
|
|
Default is 50 MiB.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="libmodplug">
|
|
<h3 class="section">3.14 libmodplug</h3>
|
|
|
|
<p>ModPlug based module demuxer
|
|
</p>
|
|
<p>See <a class="url" href="https://github.com/Konstanty/libmodplug">https://github.com/Konstanty/libmodplug</a>
|
|
</p>
|
|
<p>It will export one 2-channel 16-bit 44.1 kHz audio stream.
|
|
Optionally, a <code class="code">pal8</code> 16-color video stream can be exported with or without printed metadata.
|
|
</p>
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">noise_reduction</samp></dt>
|
|
<dd><p>Apply a simple low-pass filter. Can be 1 (on) or 0 (off). Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">reverb_depth</samp></dt>
|
|
<dd><p>Set amount of reverb. Range 0-100. Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">reverb_delay</samp></dt>
|
|
<dd><p>Set delay in ms, clamped to 40-250 ms. Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">bass_amount</samp></dt>
|
|
<dd><p>Apply bass expansion a.k.a. XBass or megabass. Range is 0 (quiet) to 100 (loud). Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">bass_range</samp></dt>
|
|
<dd><p>Set cutoff i.e. upper-bound for bass frequencies. Range is 10-100 Hz. Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">surround_depth</samp></dt>
|
|
<dd><p>Apply a Dolby Pro-Logic surround effect. Range is 0 (quiet) to 100 (heavy). Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">surround_delay</samp></dt>
|
|
<dd><p>Set surround delay in ms, clamped to 5-40 ms. Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_size</samp></dt>
|
|
<dd><p>The demuxer buffers the entire file into memory. Adjust this value to set the maximum buffer size,
|
|
which in turn, acts as a ceiling for the size of files that can be read. Range is 0 to 100 MiB.
|
|
0 removes buffer size limit (not recommended). Default is 5 MiB.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_stream_expr</samp></dt>
|
|
<dd><p>String which is evaluated using the eval API to assign colors to the generated video stream.
|
|
Variables which can be used are <code class="code">x</code>, <code class="code">y</code>, <code class="code">w</code>, <code class="code">h</code>, <code class="code">t</code>, <code class="code">speed</code>,
|
|
<code class="code">tempo</code>, <code class="code">order</code>, <code class="code">pattern</code> and <code class="code">row</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_stream</samp></dt>
|
|
<dd><p>Generate video stream. Can be 1 (on) or 0 (off). Default is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_stream_w</samp></dt>
|
|
<dd><p>Set video frame width in ’chars’ where one char indicates 8 pixels. Range is 20-512. Default is 30.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_stream_h</samp></dt>
|
|
<dd><p>Set video frame height in ’chars’ where one char indicates 8 pixels. Range is 20-512. Default is 30.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_stream_ptxt</samp></dt>
|
|
<dd><p>Print metadata on video stream. Includes <code class="code">speed</code>, <code class="code">tempo</code>, <code class="code">order</code>, <code class="code">pattern</code>,
|
|
<code class="code">row</code> and <code class="code">ts</code> (time in ms). Can be 1 (on) or 0 (off). Default is 1.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="libopenmpt">
|
|
<h3 class="section">3.15 libopenmpt</h3>
|
|
|
|
<p>libopenmpt based module demuxer
|
|
</p>
|
|
<p>See <a class="url" href="https://lib.openmpt.org/libopenmpt/">https://lib.openmpt.org/libopenmpt/</a> for more information.
|
|
</p>
|
|
<p>Some files have multiple subsongs (tracks) this can be set with the <samp class="option">subsong</samp>
|
|
option.
|
|
</p>
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">subsong</samp></dt>
|
|
<dd><p>Set the subsong index. This can be either ’all’, ’auto’, or the index of the
|
|
subsong. Subsong indexes start at 0. The default is ’auto’.
|
|
</p>
|
|
<p>The default value is to let libopenmpt choose.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">layout</samp></dt>
|
|
<dd><p>Set the channel layout. Valid values are 1, 2, and 4 channel layouts.
|
|
The default value is STEREO.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">sample_rate</samp></dt>
|
|
<dd><p>Set the sample rate for libopenmpt to output.
|
|
Range is from 1000 to INT_MAX. The value default is 48000.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="mov_002fmp4_002f3gp">
|
|
<h3 class="section">3.16 mov/mp4/3gp</h3>
|
|
|
|
<p>Demuxer for Quicktime File Format & ISO/IEC Base Media File Format (ISO/IEC 14496-12 or MPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part 12).
|
|
</p>
|
|
<p>Registered extensions: mov, mp4, m4a, 3gp, 3g2, mj2, psp, m4b, ism, ismv, isma, f4v
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-3" accesskey="1">Options</a></li>
|
|
<li><a href="#Audible-AAX" accesskey="2">Audible AAX</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-3">
|
|
<h4 class="subsection">3.16.1 Options</h4>
|
|
|
|
<p>This demuxer accepts the following options:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">enable_drefs</samp></dt>
|
|
<dd><p>Enable loading of external tracks, disabled by default.
|
|
Enabling this can theoretically leak information in some use cases.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">use_absolute_path</samp></dt>
|
|
<dd><p>Allows loading of external tracks via absolute paths, disabled by default.
|
|
Enabling this poses a security risk. It should only be enabled if the source
|
|
is known to be non-malicious.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">seek_streams_individually</samp></dt>
|
|
<dd><p>When seeking, identify the closest point in each stream individually and demux packets in
|
|
that stream from identified point. This can lead to a different sequence of packets compared
|
|
to demuxing linearly from the beginning. Default is true.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">ignore_editlist</samp></dt>
|
|
<dd><p>Ignore any edit list atoms. The demuxer, by default, modifies the stream index to reflect the
|
|
timeline described by the edit list. Default is false.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">advanced_editlist</samp></dt>
|
|
<dd><p>Modify the stream index to reflect the timeline described by the edit list. <code class="code">ignore_editlist</code>
|
|
must be set to false for this option to be effective.
|
|
If both <code class="code">ignore_editlist</code> and this option are set to false, then only the
|
|
start of the stream index is modified to reflect initial dwell time or starting timestamp
|
|
described by the edit list. Default is true.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">ignore_chapters</samp></dt>
|
|
<dd><p>Don’t parse chapters. This includes GoPro ’HiLight’ tags/moments. Note that chapters are
|
|
only parsed when input is seekable. Default is false.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">use_mfra_for</samp></dt>
|
|
<dd><p>For seekable fragmented input, set fragment’s starting timestamp from media fragment random access box, if present.
|
|
</p>
|
|
<p>Following options are available:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">auto</samp>’</dt>
|
|
<dd><p>Auto-detect whether to set mfra timestamps as PTS or DTS <em class="emph">(default)</em>
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">dts</samp>’</dt>
|
|
<dd><p>Set mfra timestamps as DTS
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">pts</samp>’</dt>
|
|
<dd><p>Set mfra timestamps as PTS
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">0</samp>’</dt>
|
|
<dd><p>Don’t use mfra box to set timestamps
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">use_tfdt</samp></dt>
|
|
<dd><p>For fragmented input, set fragment’s starting timestamp to <code class="code">baseMediaDecodeTime</code> from the <code class="code">tfdt</code> box.
|
|
Default is enabled, which will prefer to use the <code class="code">tfdt</code> box to set DTS. Disable to use the <code class="code">earliest_presentation_time</code> from the <code class="code">sidx</code> box.
|
|
In either case, the timestamp from the <code class="code">mfra</code> box will be used if it’s available and <code class="code">use_mfra_for</code> is
|
|
set to pts or dts.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">export_all</samp></dt>
|
|
<dd><p>Export unrecognized boxes within the <var class="var">udta</var> box as metadata entries. The first four
|
|
characters of the box type are set as the key. Default is false.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">export_xmp</samp></dt>
|
|
<dd><p>Export entire contents of <var class="var">XMP_</var> box and <var class="var">uuid</var> box as a string with key <code class="code">xmp</code>. Note that
|
|
if <code class="code">export_all</code> is set and this option isn’t, the contents of <var class="var">XMP_</var> box are still exported
|
|
but with key <code class="code">XMP_</code>. Default is false.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">activation_bytes</samp></dt>
|
|
<dd><p>4-byte key required to decrypt Audible AAX and AAX+ files. See Audible AAX subsection below.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">audible_fixed_key</samp></dt>
|
|
<dd><p>Fixed key used for handling Audible AAX/AAX+ files. It has been pre-set so should not be necessary to
|
|
specify.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">decryption_key</samp></dt>
|
|
<dd><p>16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_stts_delta</samp></dt>
|
|
<dd><p>Very high sample deltas written in a trak’s stts box may occasionally be intended but usually they are written in
|
|
error or used to store a negative value for dts correction when treated as signed 32-bit integers. This option lets
|
|
the user set an upper limit, beyond which the delta is clamped to 1. Values greater than the limit if negative when
|
|
cast to int32 are used to adjust onward dts.
|
|
</p>
|
|
<p>Unit is the track time scale. Range is 0 to UINT_MAX. Default is <code class="code">UINT_MAX - 48000*10</code> which allows upto
|
|
a 10 second dts correction for 48 kHz audio streams while accommodating 99.9% of <code class="code">uint32</code> range.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Audible-AAX">
|
|
<h4 class="subsection">3.16.2 Audible AAX</h4>
|
|
|
|
<p>Audible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte activation secret.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
|
|
</pre></div>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="mpegts">
|
|
<h3 class="section">3.17 mpegts</h3>
|
|
|
|
<p>MPEG-2 transport stream demuxer.
|
|
</p>
|
|
<p>This demuxer accepts the following options:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">resync_size</samp></dt>
|
|
<dd><p>Set size limit for looking up a new synchronization. Default value is
|
|
65536.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">skip_unknown_pmt</samp></dt>
|
|
<dd><p>Skip PMTs for programs not defined in the PAT. Default value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">fix_teletext_pts</samp></dt>
|
|
<dd><p>Override teletext packet PTS and DTS values with the timestamps calculated
|
|
from the PCR of the first program which the teletext stream is part of and is
|
|
not discarded. Default value is 1, set this option to 0 if you want your
|
|
teletext packet PTS and DTS values untouched.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">ts_packetsize</samp></dt>
|
|
<dd><p>Output option carrying the raw packet size in bytes.
|
|
Show the detected raw packet size, cannot be set by the user.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">scan_all_pmts</samp></dt>
|
|
<dd><p>Scan and combine all PMTs. The value is an integer with value from -1
|
|
to 1 (-1 means automatic setting, 1 means enabled, 0 means
|
|
disabled). Default value is -1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">merge_pmt_versions</samp></dt>
|
|
<dd><p>Re-use existing streams when a PMT’s version is updated and elementary
|
|
streams move to different PIDs. Default value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_packet_size</samp></dt>
|
|
<dd><p>Set maximum size, in bytes, of packet emitted by the demuxer. Payloads above this size
|
|
are split across multiple packets. Range is 1 to INT_MAX/2. Default is 204800 bytes.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="mpjpeg">
|
|
<h3 class="section">3.18 mpjpeg</h3>
|
|
|
|
<p>MJPEG encapsulated in multi-part MIME demuxer.
|
|
</p>
|
|
<p>This demuxer allows reading of MJPEG, where each frame is represented as a part of
|
|
multipart/x-mixed-replace stream.
|
|
</p><dl class="table">
|
|
<dt><samp class="option">strict_mime_boundary</samp></dt>
|
|
<dd><p>Default implementation applies a relaxed standard to multi-part MIME boundary detection,
|
|
to prevent regression with numerous existing endpoints not generating a proper MIME
|
|
MJPEG stream. Turning this option on by setting it to 1 will result in a stricter check
|
|
of the boundary value.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="rawvideo">
|
|
<h3 class="section">3.19 rawvideo</h3>
|
|
|
|
<p>Raw video demuxer.
|
|
</p>
|
|
<p>This demuxer allows one to read raw video data. Since there is no header
|
|
specifying the assumed video parameters, the user must specify them
|
|
in order to be able to decode the data correctly.
|
|
</p>
|
|
<p>This demuxer accepts the following options:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">framerate</samp></dt>
|
|
<dd><p>Set input video frame rate. Default value is 25.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">pixel_format</samp></dt>
|
|
<dd><p>Set the input video pixel format. Default value is <code class="code">yuv420p</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_size</samp></dt>
|
|
<dd><p>Set the input video size. This value must be specified explicitly.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>For example to read a rawvideo file <samp class="file">input.raw</samp> with
|
|
<code class="command">ffplay</code>, assuming a pixel format of <code class="code">rgb24</code>, a video
|
|
size of <code class="code">320x240</code>, and a frame rate of 10 images per second, use
|
|
the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
|
|
</pre></div>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="sbg">
|
|
<h3 class="section">3.20 sbg</h3>
|
|
|
|
<p>SBaGen script demuxer.
|
|
</p>
|
|
<p>This demuxer reads the script language used by SBaGen
|
|
<a class="url" href="http://uazu.net/sbagen/">http://uazu.net/sbagen/</a> to generate binaural beats sessions. A SBG
|
|
script looks like that:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">-SE
|
|
a: 300-2.5/3 440+4.5/0
|
|
b: 300-2.5/0 440+4.5/3
|
|
off: -
|
|
NOW == a
|
|
+0:07:00 == b
|
|
+0:14:00 == a
|
|
+0:21:00 == b
|
|
+0:30:00 off
|
|
</pre></div>
|
|
|
|
<p>A SBG script can mix absolute and relative timestamps. If the script uses
|
|
either only absolute timestamps (including the script start time) or only
|
|
relative ones, then its layout is fixed, and the conversion is
|
|
straightforward. On the other hand, if the script mixes both kind of
|
|
timestamps, then the <var class="var">NOW</var> reference for relative timestamps will be
|
|
taken from the current time of day at the time the script is read, and the
|
|
script layout will be frozen according to that reference. That means that if
|
|
the script is directly played, the actual times will match the absolute
|
|
timestamps up to the sound controller’s clock accuracy, but if the user
|
|
somehow pauses the playback or seeks, all times will be shifted accordingly.
|
|
</p>
|
|
</div>
|
|
<div class="section-level-extent" id="tedcaptions">
|
|
<h3 class="section">3.21 tedcaptions</h3>
|
|
|
|
<p>JSON captions used for <a class="url" href="http://www.ted.com/">TED Talks</a>.
|
|
</p>
|
|
<p>TED does not provide links to the captions, but they can be guessed from the
|
|
page. The file <samp class="file">tools/bookmarklets.html</samp> from the FFmpeg source tree
|
|
contains a bookmarklet to expose them.
|
|
</p>
|
|
<p>This demuxer accepts the following option:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">start_time</samp></dt>
|
|
<dd><p>Set the start time of the TED talk, in milliseconds. The default is 15000
|
|
(15s). It is used to sync the captions with the downloadable videos, because
|
|
they include a 15s intro.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>Example: convert the captions to a format most players understand:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt
|
|
</pre></div>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="vapoursynth">
|
|
<h3 class="section">3.22 vapoursynth</h3>
|
|
|
|
<p>Vapoursynth wrapper.
|
|
</p>
|
|
<p>Due to security concerns, Vapoursynth scripts will not
|
|
be autodetected so the input format has to be forced. For ff* CLI tools,
|
|
add <code class="code">-f vapoursynth</code> before the input <code class="code">-i yourscript.vpy</code>.
|
|
</p>
|
|
<p>This demuxer accepts the following option:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">max_script_size</samp></dt>
|
|
<dd><p>The demuxer buffers the entire script into memory. Adjust this value to set the maximum buffer size,
|
|
which in turn, acts as a ceiling for the size of scripts that can be read.
|
|
Default is 1 MiB.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="chapter-level-extent" id="Muxers">
|
|
<h2 class="chapter">4 Muxers</h2>
|
|
|
|
<p>Muxers are configured elements in FFmpeg which allow writing
|
|
multimedia streams to a particular type of file.
|
|
</p>
|
|
<p>When you configure your FFmpeg build, all the supported muxers
|
|
are enabled by default. You can list all available muxers using the
|
|
configure option <code class="code">--list-muxers</code>.
|
|
</p>
|
|
<p>You can disable all the muxers with the configure option
|
|
<code class="code">--disable-muxers</code> and selectively enable / disable single muxers
|
|
with the options <code class="code">--enable-muxer=<var class="var">MUXER</var></code> /
|
|
<code class="code">--disable-muxer=<var class="var">MUXER</var></code>.
|
|
</p>
|
|
<p>The option <code class="code">-muxers</code> of the ff* tools will display the list of
|
|
enabled muxers. Use <code class="code">-formats</code> to view a combined list of
|
|
enabled demuxers and muxers.
|
|
</p>
|
|
<p>A description of some of the currently available muxers follows.
|
|
</p>
|
|
<a class="anchor" id="a64"></a><ul class="mini-toc">
|
|
<li><a href="#a64-1" accesskey="1">a64</a></li>
|
|
<li><a href="#adts-1" accesskey="2">adts</a></li>
|
|
<li><a href="#aiff-1" accesskey="3">aiff</a></li>
|
|
<li><a href="#alp-1" accesskey="4">alp</a></li>
|
|
<li><a href="#asf-2" accesskey="5">asf</a></li>
|
|
<li><a href="#avi-1" accesskey="6">avi</a></li>
|
|
<li><a href="#chromaprint-1" accesskey="7">chromaprint</a></li>
|
|
<li><a href="#crc-1" accesskey="8">crc</a></li>
|
|
<li><a href="#dash-2" accesskey="9">dash</a></li>
|
|
<li><a href="#fifo-1">fifo</a></li>
|
|
<li><a href="#flv">flv</a></li>
|
|
<li><a href="#framecrc-1">framecrc</a></li>
|
|
<li><a href="#framehash-1">framehash</a></li>
|
|
<li><a href="#framemd5-1">framemd5</a></li>
|
|
<li><a href="#gif-2">gif</a></li>
|
|
<li><a href="#hash-1">hash</a></li>
|
|
<li><a href="#hls-2">hls</a></li>
|
|
<li><a href="#ico-1">ico</a></li>
|
|
<li><a href="#image2-2">image2</a></li>
|
|
<li><a href="#matroska">matroska</a></li>
|
|
<li><a href="#md5-1">md5</a></li>
|
|
<li><a href="#mov_002c-mp4_002c-ismv">mov, mp4, ismv</a></li>
|
|
<li><a href="#mp3">mp3</a></li>
|
|
<li><a href="#mpegts-1">mpegts</a></li>
|
|
<li><a href="#mxf_002c-mxf_005fd10_002c-mxf_005fopatom">mxf, mxf_d10, mxf_opatom</a></li>
|
|
<li><a href="#null">null</a></li>
|
|
<li><a href="#nut">nut</a></li>
|
|
<li><a href="#ogg">ogg</a></li>
|
|
<li><a href="#raw-muxers-1">raw muxers</a></li>
|
|
<li><a href="#segment_002c-stream_005fsegment_002c-ssegment">segment, stream_segment, ssegment</a></li>
|
|
<li><a href="#smoothstreaming">smoothstreaming</a></li>
|
|
<li><a href="#streamhash-1">streamhash</a></li>
|
|
<li><a href="#tee-1">tee</a></li>
|
|
<li><a href="#webm_005fchunk">webm_chunk</a></li>
|
|
<li><a href="#webm_005fdash_005fmanifest">webm_dash_manifest</a></li>
|
|
</ul>
|
|
<div class="section-level-extent" id="a64-1">
|
|
<h3 class="section">4.1 a64</h3>
|
|
|
|
<p>A64 muxer for Commodore 64 video. Accepts a single <code class="code">a64_multi</code> or <code class="code">a64_multi5</code> codec video stream.
|
|
</p>
|
|
<a class="anchor" id="adts"></a></div>
|
|
<div class="section-level-extent" id="adts-1">
|
|
<h3 class="section">4.2 adts</h3>
|
|
|
|
<p>Audio Data Transport Stream muxer. It accepts a single AAC stream.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-4" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-4">
|
|
<h4 class="subsection">4.2.1 Options</h4>
|
|
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">write_id3v2 <var class="var">bool</var></samp></dt>
|
|
<dd><p>Enable to write ID3v2.4 tags at the start of the stream. Default is disabled.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_apetag <var class="var">bool</var></samp></dt>
|
|
<dd><p>Enable to write APE tags at the end of the stream. Default is disabled.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_mpeg2 <var class="var">bool</var></samp></dt>
|
|
<dd><p>Enable to set MPEG version bit in the ADTS frame header to 1 which indicates MPEG-2. Default is 0, which indicates MPEG-4.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="aiff"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="aiff-1">
|
|
<h3 class="section">4.3 aiff</h3>
|
|
|
|
<p>Audio Interchange File Format muxer.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-5" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-5">
|
|
<h4 class="subsection">4.3.1 Options</h4>
|
|
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">write_id3v2</samp></dt>
|
|
<dd><p>Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">id3v2_version</samp></dt>
|
|
<dd><p>Select ID3v2 version to write. Currently only version 3 and 4 (aka.
|
|
ID3v2.3 and ID3v2.4) are supported. The default is version 4.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="alp"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="alp-1">
|
|
<h3 class="section">4.4 alp</h3>
|
|
|
|
<p>Muxer for audio of High Voltage Software’s Lego Racers game. It accepts a single ADPCM_IMA_ALP stream
|
|
with no more than 2 channels nor a sample rate greater than 44100 Hz.
|
|
</p>
|
|
<p>Extensions: tun, pcm
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-6" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-6">
|
|
<h4 class="subsection">4.4.1 Options</h4>
|
|
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">type <var class="var">type</var></samp></dt>
|
|
<dd><p>Set file type.
|
|
</p>
|
|
<dl class="table">
|
|
<dt>‘<samp class="samp">tun</samp>’</dt>
|
|
<dd><p>Set file type as music. Must have a sample rate of 22050 Hz.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">pcm</samp>’</dt>
|
|
<dd><p>Set file type as sfx.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">auto</samp>’</dt>
|
|
<dd><p>Set file type as per output file extension. <code class="code">.pcm</code> results in type <code class="code">pcm</code> else type <code class="code">tun</code> is set. <var class="var">(default)</var>
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="asf"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="asf-2">
|
|
<h3 class="section">4.5 asf</h3>
|
|
|
|
<p>Advanced Systems Format muxer.
|
|
</p>
|
|
<p>Note that Windows Media Audio (wma) and Windows Media Video (wmv) use this
|
|
muxer too.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-7" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-7">
|
|
<h4 class="subsection">4.5.1 Options</h4>
|
|
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">packet_size</samp></dt>
|
|
<dd><p>Set the muxer packet size. By tuning this setting you may reduce data
|
|
fragmentation or muxer overhead depending on your source. Default value is
|
|
3200, minimum is 100, maximum is 64k.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="avi"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="avi-1">
|
|
<h3 class="section">4.6 avi</h3>
|
|
|
|
<p>Audio Video Interleaved muxer.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-8" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-8">
|
|
<h4 class="subsection">4.6.1 Options</h4>
|
|
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">reserve_index_space</samp></dt>
|
|
<dd><p>Reserve the specified amount of bytes for the OpenDML master index of each
|
|
stream within the file header. By default additional master indexes are
|
|
embedded within the data packets if there is no space left in the first master
|
|
index and are linked together as a chain of indexes. This index structure can
|
|
cause problems for some use cases, e.g. third-party software strictly relying
|
|
on the OpenDML index specification or when file seeking is slow. Reserving
|
|
enough index space in the file header avoids these problems.
|
|
</p>
|
|
<p>The required index space depends on the output file size and should be about 16
|
|
bytes per gigabyte. When this option is omitted or set to zero the necessary
|
|
index space is guessed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_channel_mask</samp></dt>
|
|
<dd><p>Write the channel layout mask into the audio stream header.
|
|
</p>
|
|
<p>This option is enabled by default. Disabling the channel mask can be useful in
|
|
specific scenarios, e.g. when merging multiple audio streams into one for
|
|
compatibility with software that only supports a single audio stream in AVI
|
|
(see <a data-manual="ffmpeg-filters" href="ffmpeg-filters.html#amerge">(ffmpeg-filters)the "amerge" section in the ffmpeg-filters manual</a>).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">flipped_raw_rgb</samp></dt>
|
|
<dd><p>If set to true, store positive height for raw RGB bitmaps, which indicates
|
|
bitmap is stored bottom-up. Note that this option does not flip the bitmap
|
|
which has to be done manually beforehand, e.g. by using the vflip filter.
|
|
Default is <var class="var">false</var> and indicates bitmap is stored top down.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="chromaprint"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="chromaprint-1">
|
|
<h3 class="section">4.7 chromaprint</h3>
|
|
|
|
<p>Chromaprint fingerprinter.
|
|
</p>
|
|
<p>This muxer feeds audio data to the Chromaprint library,
|
|
which generates a fingerprint for the provided audio data. See <a class="url" href="https://acoustid.org/chromaprint">https://acoustid.org/chromaprint</a>
|
|
</p>
|
|
<p>It takes a single signed native-endian 16-bit raw audio stream of at most 2 channels.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-9" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-9">
|
|
<h4 class="subsection">4.7.1 Options</h4>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">silence_threshold</samp></dt>
|
|
<dd><p>Threshold for detecting silence. Range is from -1 to 32767, where -1 disables
|
|
silence detection. Silence detection can only be used with version 3 of the
|
|
algorithm.
|
|
Silence detection must be disabled for use with the AcoustID service. Default is -1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">algorithm</samp></dt>
|
|
<dd><p>Version of algorithm to fingerprint with. Range is 0 to 4.
|
|
Version 3 enables silence detection. Default is 1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">fp_format</samp></dt>
|
|
<dd><p>Format to output the fingerprint as. Accepts the following options:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">raw</samp>’</dt>
|
|
<dd><p>Binary raw fingerprint
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">compressed</samp>’</dt>
|
|
<dd><p>Binary compressed fingerprint
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">base64</samp>’</dt>
|
|
<dd><p>Base64 compressed fingerprint <em class="emph">(default)</em>
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="crc"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="crc-1">
|
|
<h3 class="section">4.8 crc</h3>
|
|
|
|
<p>CRC (Cyclic Redundancy Check) testing format.
|
|
</p>
|
|
<p>This muxer computes and prints the Adler-32 CRC of all the input audio
|
|
and video frames. By default audio frames are converted to signed
|
|
16-bit raw audio and video frames to raw video before computing the
|
|
CRC.
|
|
</p>
|
|
<p>The output of the muxer consists of a single line of the form:
|
|
CRC=0x<var class="var">CRC</var>, where <var class="var">CRC</var> is a hexadecimal number 0-padded to
|
|
8 digits containing the CRC for all the decoded input frames.
|
|
</p>
|
|
<p>See also the <a class="ref" href="#framecrc">framecrc</a> muxer.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-2" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-2">
|
|
<h4 class="subsection">4.8.1 Examples</h4>
|
|
|
|
<p>For example to compute the CRC of the input, and store it in the file
|
|
<samp class="file">out.crc</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f crc out.crc
|
|
</pre></div>
|
|
|
|
<p>You can print the CRC to stdout with the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f crc -
|
|
</pre></div>
|
|
|
|
<p>You can select the output format of each frame with <code class="command">ffmpeg</code> by
|
|
specifying the audio and video codec and format. For example to
|
|
compute the CRC of the input audio converted to PCM unsigned 8-bit
|
|
and the input video converted to MPEG-2 video, use the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f crc -
|
|
</pre></div>
|
|
|
|
<a class="anchor" id="dash"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="dash-2">
|
|
<h3 class="section">4.9 dash</h3>
|
|
|
|
<p>Dynamic Adaptive Streaming over HTTP (DASH) muxer that creates segments
|
|
and manifest files according to the MPEG-DASH standard ISO/IEC 23009-1:2014.
|
|
</p>
|
|
<p>For more information see:
|
|
</p>
|
|
<ul class="itemize mark-bullet">
|
|
<li>ISO DASH Specification: <a class="url" href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip</a>
|
|
</li><li>WebM DASH Specification: <a class="url" href="https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification">https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification</a>
|
|
</li></ul>
|
|
|
|
<p>It creates a MPD manifest file and segment files for each stream.
|
|
</p>
|
|
<p>The segment filename might contain pre-defined identifiers used with SegmentTemplate
|
|
as defined in section 5.3.9.4.4 of the standard. Available identifiers are "$RepresentationID$",
|
|
"$Number$", "$Bandwidth$" and "$Time$".
|
|
In addition to the standard identifiers, an ffmpeg-specific "$ext$" identifier is also supported.
|
|
When specified ffmpeg will replace $ext$ in the file name with muxing format’s extensions such as mp4, webm etc.,
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i <input> -map 0 -map 0 -c:a libfdk_aac -c:v libx264 \
|
|
-b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline \
|
|
-profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \
|
|
-b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
|
|
-window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" \
|
|
-f dash /path/to/out.mpd
|
|
</pre></div>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">seg_duration <var class="var">duration</var></samp></dt>
|
|
<dd><p>Set the segment length in seconds (fractional value can be set). The value is
|
|
treated as average segment duration when <var class="var">use_template</var> is enabled and
|
|
<var class="var">use_timeline</var> is disabled and as minimum segment duration for all the other
|
|
use cases.
|
|
</p></dd>
|
|
<dt><samp class="option">frag_duration <var class="var">duration</var></samp></dt>
|
|
<dd><p>Set the length in seconds of fragments within segments (fractional value can be set).
|
|
</p></dd>
|
|
<dt><samp class="option">frag_type <var class="var">type</var></samp></dt>
|
|
<dd><p>Set the type of interval for fragmentation.
|
|
</p></dd>
|
|
<dt><samp class="option">window_size <var class="var">size</var></samp></dt>
|
|
<dd><p>Set the maximum number of segments kept in the manifest.
|
|
</p></dd>
|
|
<dt><samp class="option">extra_window_size <var class="var">size</var></samp></dt>
|
|
<dd><p>Set the maximum number of segments kept outside of the manifest before removing from disk.
|
|
</p></dd>
|
|
<dt><samp class="option">remove_at_exit <var class="var">remove</var></samp></dt>
|
|
<dd><p>Enable (1) or disable (0) removal of all segments when finished.
|
|
</p></dd>
|
|
<dt><samp class="option">use_template <var class="var">template</var></samp></dt>
|
|
<dd><p>Enable (1) or disable (0) use of SegmentTemplate instead of SegmentList.
|
|
</p></dd>
|
|
<dt><samp class="option">use_timeline <var class="var">timeline</var></samp></dt>
|
|
<dd><p>Enable (1) or disable (0) use of SegmentTimeline in SegmentTemplate.
|
|
</p></dd>
|
|
<dt><samp class="option">single_file <var class="var">single_file</var></samp></dt>
|
|
<dd><p>Enable (1) or disable (0) storing all segments in one file, accessed using byte ranges.
|
|
</p></dd>
|
|
<dt><samp class="option">single_file_name <var class="var">file_name</var></samp></dt>
|
|
<dd><p>DASH-templated name to be used for baseURL. Implies <var class="var">single_file</var> set to "1". In the template, "$ext$" is replaced with the file name extension specific for the segment format.
|
|
</p></dd>
|
|
<dt><samp class="option">init_seg_name <var class="var">init_name</var></samp></dt>
|
|
<dd><p>DASH-templated name to used for the initialization segment. Default is "init-stream$RepresentationID$.$ext$". "$ext$" is replaced with the file name extension specific for the segment format.
|
|
</p></dd>
|
|
<dt><samp class="option">media_seg_name <var class="var">segment_name</var></samp></dt>
|
|
<dd><p>DASH-templated name to used for the media segments. Default is "chunk-stream$RepresentationID$-$Number%05d$.$ext$". "$ext$" is replaced with the file name extension specific for the segment format.
|
|
</p></dd>
|
|
<dt><samp class="option">utc_timing_url <var class="var">utc_url</var></samp></dt>
|
|
<dd><p>URL of the page that will return the UTC timestamp in ISO format. Example: "https://time.akamai.com/?iso"
|
|
</p></dd>
|
|
<dt><samp class="option">method <var class="var">method</var></samp></dt>
|
|
<dd><p>Use the given HTTP method to create output files. Generally set to PUT or POST.
|
|
</p></dd>
|
|
<dt><samp class="option">http_user_agent <var class="var">user_agent</var></samp></dt>
|
|
<dd><p>Override User-Agent field in HTTP header. Applicable only for HTTP output.
|
|
</p></dd>
|
|
<dt><samp class="option">http_persistent <var class="var">http_persistent</var></samp></dt>
|
|
<dd><p>Use persistent HTTP connections. Applicable only for HTTP output.
|
|
</p></dd>
|
|
<dt><samp class="option">hls_playlist <var class="var">hls_playlist</var></samp></dt>
|
|
<dd><p>Generate HLS playlist files as well. The master playlist is generated with the filename <var class="var">hls_master_name</var>.
|
|
One media playlist file is generated for each stream with filenames media_0.m3u8, media_1.m3u8, etc.
|
|
</p></dd>
|
|
<dt><samp class="option">hls_master_name <var class="var">file_name</var></samp></dt>
|
|
<dd><p>HLS master playlist name. Default is "master.m3u8".
|
|
</p></dd>
|
|
<dt><samp class="option">streaming <var class="var">streaming</var></samp></dt>
|
|
<dd><p>Enable (1) or disable (0) chunk streaming mode of output. In chunk streaming
|
|
mode, each frame will be a moof fragment which forms a chunk.
|
|
</p></dd>
|
|
<dt><samp class="option">adaptation_sets <var class="var">adaptation_sets</var></samp></dt>
|
|
<dd><p>Assign streams to AdaptationSets. Syntax is "id=x,streams=a,b,c id=y,streams=d,e" with x and y being the IDs
|
|
of the adaptation sets and a,b,c,d and e are the indices of the mapped streams.
|
|
</p>
|
|
<p>To map all video (or audio) streams to an AdaptationSet, "v" (or "a") can be used as stream identifier instead of IDs.
|
|
</p>
|
|
<p>When no assignment is defined, this defaults to an AdaptationSet for each stream.
|
|
</p>
|
|
<p>Optional syntax is "id=x,seg_duration=x,frag_duration=x,frag_type=type,descriptor=descriptor_string,streams=a,b,c id=y,seg_duration=y,frag_type=type,streams=d,e" and so on,
|
|
descriptor is useful to the scheme defined by ISO/IEC 23009-1:2014/Amd.2:2015.
|
|
For example, -adaptation_sets "id=0,descriptor=<SupplementalProperty schemeIdUri=\"urn:mpeg:dash:srd:2014\" value=\"0,0,0,1,1,2,2\"/>,streams=v".
|
|
Please note that descriptor string should be a self-closing xml tag.
|
|
seg_duration, frag_duration and frag_type override the global option values for each adaptation set.
|
|
For example, -adaptation_sets "id=0,seg_duration=2,frag_duration=1,frag_type=duration,streams=v id=1,seg_duration=2,frag_type=none,streams=a"
|
|
type_id marks an adaptation set as containing streams meant to be used for Trick Mode for the referenced adaptation set.
|
|
For example, -adaptation_sets "id=0,seg_duration=2,frag_type=none,streams=0 id=1,seg_duration=10,frag_type=none,trick_id=0,streams=1"
|
|
</p></dd>
|
|
<dt><samp class="option">timeout <var class="var">timeout</var></samp></dt>
|
|
<dd><p>Set timeout for socket I/O operations. Applicable only for HTTP output.
|
|
</p></dd>
|
|
<dt><samp class="option">index_correction <var class="var">index_correction</var></samp></dt>
|
|
<dd><p>Enable (1) or Disable (0) segment index correction logic. Applicable only when
|
|
<var class="var">use_template</var> is enabled and <var class="var">use_timeline</var> is disabled.
|
|
</p>
|
|
<p>When enabled, the logic monitors the flow of segment indexes. If a streams’s
|
|
segment index value is not at the expected real time position, then the logic
|
|
corrects that index value.
|
|
</p>
|
|
<p>Typically this logic is needed in live streaming use cases. The network bandwidth
|
|
fluctuations are common during long run streaming. Each fluctuation can cause
|
|
the segment indexes fall behind the expected real time position.
|
|
</p></dd>
|
|
<dt><samp class="option">format_options <var class="var">options_list</var></samp></dt>
|
|
<dd><p>Set container format (mp4/webm) options using a <code class="code">:</code> separated list of
|
|
key=value parameters. Values containing <code class="code">:</code> special characters must be
|
|
escaped.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">global_sidx <var class="var">global_sidx</var></samp></dt>
|
|
<dd><p>Write global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">dash_segment_type <var class="var">dash_segment_type</var></samp></dt>
|
|
<dd><p>Possible values:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">auto</samp></dt>
|
|
<dd><p>If this flag is set, the dash segment files format will be selected based on the stream codec. This is the default mode.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mp4</samp></dt>
|
|
<dd><p>If this flag is set, the dash segment files will be in in ISOBMFF format.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">webm</samp></dt>
|
|
<dd><p>If this flag is set, the dash segment files will be in in WebM format.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">ignore_io_errors <var class="var">ignore_io_errors</var></samp></dt>
|
|
<dd><p>Ignore IO errors during open and write. Useful for long-duration runs with network output.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">lhls <var class="var">lhls</var></samp></dt>
|
|
<dd><p>Enable Low-latency HLS(LHLS). Adds #EXT-X-PREFETCH tag with current segment’s URI.
|
|
hls.js player folks are trying to standardize an open LHLS spec. The draft spec is available in https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md
|
|
This option tries to comply with the above open spec.
|
|
It enables <var class="var">streaming</var> and <var class="var">hls_playlist</var> options automatically.
|
|
This is an experimental feature.
|
|
</p>
|
|
<p>Note: This is not Apple’s version LHLS. See <a class="url" href="https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis">https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis</a>
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">ldash <var class="var">ldash</var></samp></dt>
|
|
<dd><p>Enable Low-latency Dash by constraining the presence and values of some elements.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">master_m3u8_publish_rate <var class="var">master_m3u8_publish_rate</var></samp></dt>
|
|
<dd><p>Publish master playlist repeatedly every after specified number of segment intervals.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_prft <var class="var">write_prft</var></samp></dt>
|
|
<dd><p>Write Producer Reference Time elements on supported streams. This also enables writing
|
|
prft boxes in the underlying muxer. Applicable only when the <var class="var">utc_url</var> option is enabled.
|
|
It’s set to auto by default, in which case the muxer will attempt to enable it only in modes
|
|
that require it.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpd_profile <var class="var">mpd_profile</var></samp></dt>
|
|
<dd><p>Set one or more manifest profiles.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">http_opts <var class="var">http_opts</var></samp></dt>
|
|
<dd><p>A :-separated list of key=value options to pass to the underlying HTTP
|
|
protocol. Applicable only for HTTP output.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">target_latency <var class="var">target_latency</var></samp></dt>
|
|
<dd><p>Set an intended target latency in seconds (fractional value can be set) for serving. Applicable only when <var class="var">streaming</var> and <var class="var">write_prft</var> options are enabled.
|
|
This is an informative fields clients can use to measure the latency of the service.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">min_playback_rate <var class="var">min_playback_rate</var></samp></dt>
|
|
<dd><p>Set the minimum playback rate indicated as appropriate for the purposes of automatically
|
|
adjusting playback latency and buffer occupancy during normal playback by clients.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_playback_rate <var class="var">max_playback_rate</var></samp></dt>
|
|
<dd><p>Set the maximum playback rate indicated as appropriate for the purposes of automatically
|
|
adjusting playback latency and buffer occupancy during normal playback by clients.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">update_period <var class="var">update_period</var></samp></dt>
|
|
<dd><p>Set the mpd update period ,for dynamic content.
|
|
The unit is second.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="fifo"></a></div>
|
|
<div class="section-level-extent" id="fifo-1">
|
|
<h3 class="section">4.10 fifo</h3>
|
|
|
|
<p>The fifo pseudo-muxer allows the separation of encoding and muxing by using
|
|
first-in-first-out queue and running the actual muxer in a separate thread. This
|
|
is especially useful in combination with the <a class="ref" href="#tee">tee</a> muxer and can be used to
|
|
send data to several destinations with different reliability/writing speed/latency.
|
|
</p>
|
|
<p>API users should be aware that callback functions (interrupt_callback,
|
|
io_open and io_close) used within its AVFormatContext must be thread-safe.
|
|
</p>
|
|
<p>The behavior of the fifo muxer if the queue fills up or if the output fails is
|
|
selectable,
|
|
</p>
|
|
<ul class="itemize mark-bullet">
|
|
<li>output can be transparently restarted with configurable delay between retries
|
|
based on real time or time of the processed stream.
|
|
|
|
</li><li>encoding can be blocked during temporary failure, or continue transparently
|
|
dropping packets in case fifo queue fills up.
|
|
|
|
</li></ul>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">fifo_format</samp></dt>
|
|
<dd><p>Specify the format name. Useful if it cannot be guessed from the
|
|
output name suffix.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">queue_size</samp></dt>
|
|
<dd><p>Specify size of the queue (number of packets). Default value is 60.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">format_opts</samp></dt>
|
|
<dd><p>Specify format options for the underlying muxer. Muxer options can be specified
|
|
as a list of <var class="var">key</var>=<var class="var">value</var> pairs separated by ’:’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">drop_pkts_on_overflow <var class="var">bool</var></samp></dt>
|
|
<dd><p>If set to 1 (true), in case the fifo queue fills up, packets will be dropped
|
|
rather than blocking the encoder. This makes it possible to continue streaming without
|
|
delaying the input, at the cost of omitting part of the stream. By default
|
|
this option is set to 0 (false), so in such cases the encoder will be blocked
|
|
until the muxer processes some of the packets and none of them is lost.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">attempt_recovery <var class="var">bool</var></samp></dt>
|
|
<dd><p>If failure occurs, attempt to recover the output. This is especially useful
|
|
when used with network output, since it makes it possible to restart streaming transparently.
|
|
By default this option is set to 0 (false).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">max_recovery_attempts</samp></dt>
|
|
<dd><p>Sets maximum number of successive unsuccessful recovery attempts after which
|
|
the output fails permanently. By default this option is set to 0 (unlimited).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">recovery_wait_time <var class="var">duration</var></samp></dt>
|
|
<dd><p>Waiting time before the next recovery attempt after previous unsuccessful
|
|
recovery attempt. Default value is 5 seconds.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">recovery_wait_streamtime <var class="var">bool</var></samp></dt>
|
|
<dd><p>If set to 0 (false), the real time is used when waiting for the recovery
|
|
attempt (i.e. the recovery will be attempted after at least
|
|
recovery_wait_time seconds).
|
|
If set to 1 (true), the time of the processed stream is taken into account
|
|
instead (i.e. the recovery will be attempted after at least <var class="var">recovery_wait_time</var>
|
|
seconds of the stream is omitted).
|
|
By default, this option is set to 0 (false).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">recover_any_error <var class="var">bool</var></samp></dt>
|
|
<dd><p>If set to 1 (true), recovery will be attempted regardless of type of the error
|
|
causing the failure. By default this option is set to 0 (false) and in case of
|
|
certain (usually permanent) errors the recovery is not attempted even when
|
|
<var class="var">attempt_recovery</var> is set to 1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">restart_with_keyframe <var class="var">bool</var></samp></dt>
|
|
<dd><p>Specify whether to wait for the keyframe after recovering from
|
|
queue overflow or failure. This option is set to 0 (false) by default.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">timeshift <var class="var">duration</var></samp></dt>
|
|
<dd><p>Buffer the specified amount of packets and delay writing the output. Note that
|
|
<var class="var">queue_size</var> must be big enough to store the packets for timeshift. At the
|
|
end of the input the fifo buffer is flushed at realtime speed.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-3" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-3">
|
|
<h4 class="subsection">4.10.1 Examples</h4>
|
|
|
|
<ul class="itemize mark-bullet">
|
|
<li>Stream something to rtmp server, continue processing the stream at real-time
|
|
rate even in case of temporary failure (network outage) and attempt to recover
|
|
streaming every second indefinitely.
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format flv -map 0:v -map 0:a
|
|
-drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 rtmp://example.com/live/stream_name
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="flv">
|
|
<h3 class="section">4.11 flv</h3>
|
|
|
|
<p>Adobe Flash Video Format muxer.
|
|
</p>
|
|
<p>This muxer accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">flvflags <var class="var">flags</var></samp></dt>
|
|
<dd><p>Possible values:
|
|
</p>
|
|
<dl class="table">
|
|
<dt>‘<samp class="samp">aac_seq_header_detect</samp>’</dt>
|
|
<dd><p>Place AAC sequence header based on audio stream data.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">no_sequence_end</samp>’</dt>
|
|
<dd><p>Disable sequence end tag.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">no_metadata</samp>’</dt>
|
|
<dd><p>Disable metadata tag.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">no_duration_filesize</samp>’</dt>
|
|
<dd><p>Disable duration and filesize in metadata when they are equal to zero
|
|
at the end of stream. (Be used to non-seekable living stream).
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">add_keyframe_index</samp>’</dt>
|
|
<dd><p>Used to facilitate seeking; particularly for HTTP pseudo streaming.
|
|
</p></dd>
|
|
</dl>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="framecrc"></a></div>
|
|
<div class="section-level-extent" id="framecrc-1">
|
|
<h3 class="section">4.12 framecrc</h3>
|
|
|
|
<p>Per-packet CRC (Cyclic Redundancy Check) testing format.
|
|
</p>
|
|
<p>This muxer computes and prints the Adler-32 CRC for each audio
|
|
and video packet. By default audio frames are converted to signed
|
|
16-bit raw audio and video frames to raw video before computing the
|
|
CRC.
|
|
</p>
|
|
<p>The output of the muxer consists of a line for each audio and video
|
|
packet of the form:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted"><var class="var">stream_index</var>, <var class="var">packet_dts</var>, <var class="var">packet_pts</var>, <var class="var">packet_duration</var>, <var class="var">packet_size</var>, 0x<var class="var">CRC</var>
|
|
</pre></div>
|
|
|
|
<p><var class="var">CRC</var> is a hexadecimal number 0-padded to 8 digits containing the
|
|
CRC of the packet.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-4" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-4">
|
|
<h4 class="subsection">4.12.1 Examples</h4>
|
|
|
|
<p>For example to compute the CRC of the audio and video frames in
|
|
<samp class="file">INPUT</samp>, converted to raw audio and video packets, and store it
|
|
in the file <samp class="file">out.crc</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f framecrc out.crc
|
|
</pre></div>
|
|
|
|
<p>To print the information to stdout, use the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f framecrc -
|
|
</pre></div>
|
|
|
|
<p>With <code class="command">ffmpeg</code>, you can select the output format to which the
|
|
audio and video frames are encoded before computing the CRC for each
|
|
packet by specifying the audio and video codec. For example, to
|
|
compute the CRC of each decoded input audio frame converted to PCM
|
|
unsigned 8-bit and of each decoded input video frame converted to
|
|
MPEG-2 video, use the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
|
|
</pre></div>
|
|
|
|
<p>See also the <a class="ref" href="#crc">crc</a> muxer.
|
|
</p>
|
|
<a class="anchor" id="framehash"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="framehash-1">
|
|
<h3 class="section">4.13 framehash</h3>
|
|
|
|
<p>Per-packet hash testing format.
|
|
</p>
|
|
<p>This muxer computes and prints a cryptographic hash for each audio
|
|
and video packet. This can be used for packet-by-packet equality
|
|
checks without having to individually do a binary comparison on each.
|
|
</p>
|
|
<p>By default audio frames are converted to signed 16-bit raw audio and
|
|
video frames to raw video before computing the hash, but the output
|
|
of explicit conversions to other codecs can also be used. It uses the
|
|
SHA-256 cryptographic hash function by default, but supports several
|
|
other algorithms.
|
|
</p>
|
|
<p>The output of the muxer consists of a line for each audio and video
|
|
packet of the form:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted"><var class="var">stream_index</var>, <var class="var">packet_dts</var>, <var class="var">packet_pts</var>, <var class="var">packet_duration</var>, <var class="var">packet_size</var>, <var class="var">hash</var>
|
|
</pre></div>
|
|
|
|
<p><var class="var">hash</var> is a hexadecimal number representing the computed hash
|
|
for the packet.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">hash <var class="var">algorithm</var></samp></dt>
|
|
<dd><p>Use the cryptographic hash function specified by the string <var class="var">algorithm</var>.
|
|
Supported values include <code class="code">MD5</code>, <code class="code">murmur3</code>, <code class="code">RIPEMD128</code>,
|
|
<code class="code">RIPEMD160</code>, <code class="code">RIPEMD256</code>, <code class="code">RIPEMD320</code>, <code class="code">SHA160</code>,
|
|
<code class="code">SHA224</code>, <code class="code">SHA256</code> (default), <code class="code">SHA512/224</code>, <code class="code">SHA512/256</code>,
|
|
<code class="code">SHA384</code>, <code class="code">SHA512</code>, <code class="code">CRC32</code> and <code class="code">adler32</code>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-5" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-5">
|
|
<h4 class="subsection">4.13.1 Examples</h4>
|
|
|
|
<p>To compute the SHA-256 hash of the audio and video frames in <samp class="file">INPUT</samp>,
|
|
converted to raw audio and video packets, and store it in the file
|
|
<samp class="file">out.sha256</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f framehash out.sha256
|
|
</pre></div>
|
|
|
|
<p>To print the information to stdout, using the MD5 hash function, use
|
|
the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f framehash -hash md5 -
|
|
</pre></div>
|
|
|
|
<p>See also the <a class="ref" href="#hash">hash</a> muxer.
|
|
</p>
|
|
<a class="anchor" id="framemd5"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="framemd5-1">
|
|
<h3 class="section">4.14 framemd5</h3>
|
|
|
|
<p>Per-packet MD5 testing format.
|
|
</p>
|
|
<p>This is a variant of the <a class="ref" href="#framehash">framehash</a> muxer. Unlike that muxer,
|
|
it defaults to using the MD5 hash function.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-6" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-6">
|
|
<h4 class="subsection">4.14.1 Examples</h4>
|
|
|
|
<p>To compute the MD5 hash of the audio and video frames in <samp class="file">INPUT</samp>,
|
|
converted to raw audio and video packets, and store it in the file
|
|
<samp class="file">out.md5</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f framemd5 out.md5
|
|
</pre></div>
|
|
|
|
<p>To print the information to stdout, use the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f framemd5 -
|
|
</pre></div>
|
|
|
|
<p>See also the <a class="ref" href="#framehash">framehash</a> and <a class="ref" href="#md5">md5</a> muxers.
|
|
</p>
|
|
<a class="anchor" id="gif"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="gif-2">
|
|
<h3 class="section">4.15 gif</h3>
|
|
|
|
<p>Animated GIF muxer.
|
|
</p>
|
|
<p>It accepts the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">loop</samp></dt>
|
|
<dd><p>Set the number of times to loop the output. Use <code class="code">-1</code> for no loop, <code class="code">0</code>
|
|
for looping indefinitely (default).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">final_delay</samp></dt>
|
|
<dd><p>Force the delay (expressed in centiseconds) after the last frame. Each frame
|
|
ends with a delay until the next frame. The default is <code class="code">-1</code>, which is a
|
|
special value to tell the muxer to re-use the previous delay. In case of a
|
|
loop, you might want to customize this value to mark a pause for instance.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>For example, to encode a gif looping 10 times, with a 5 seconds delay between
|
|
the loops:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -loop 10 -final_delay 500 out.gif
|
|
</pre></div>
|
|
|
|
<p>Note 1: if you wish to extract the frames into separate GIF files, you need to
|
|
force the <a class="ref" href="#image2">image2</a> muxer:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -c:v gif -f image2 "out%d.gif"
|
|
</pre></div>
|
|
|
|
<p>Note 2: the GIF format has a very large time base: the delay between two frames
|
|
can therefore not be smaller than one centi second.
|
|
</p>
|
|
<a class="anchor" id="hash"></a></div>
|
|
<div class="section-level-extent" id="hash-1">
|
|
<h3 class="section">4.16 hash</h3>
|
|
|
|
<p>Hash testing format.
|
|
</p>
|
|
<p>This muxer computes and prints a cryptographic hash of all the input
|
|
audio and video frames. This can be used for equality checks without
|
|
having to do a complete binary comparison.
|
|
</p>
|
|
<p>By default audio frames are converted to signed 16-bit raw audio and
|
|
video frames to raw video before computing the hash, but the output
|
|
of explicit conversions to other codecs can also be used. Timestamps
|
|
are ignored. It uses the SHA-256 cryptographic hash function by default,
|
|
but supports several other algorithms.
|
|
</p>
|
|
<p>The output of the muxer consists of a single line of the form:
|
|
<var class="var">algo</var>=<var class="var">hash</var>, where <var class="var">algo</var> is a short string representing
|
|
the hash function used, and <var class="var">hash</var> is a hexadecimal number
|
|
representing the computed hash.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">hash <var class="var">algorithm</var></samp></dt>
|
|
<dd><p>Use the cryptographic hash function specified by the string <var class="var">algorithm</var>.
|
|
Supported values include <code class="code">MD5</code>, <code class="code">murmur3</code>, <code class="code">RIPEMD128</code>,
|
|
<code class="code">RIPEMD160</code>, <code class="code">RIPEMD256</code>, <code class="code">RIPEMD320</code>, <code class="code">SHA160</code>,
|
|
<code class="code">SHA224</code>, <code class="code">SHA256</code> (default), <code class="code">SHA512/224</code>, <code class="code">SHA512/256</code>,
|
|
<code class="code">SHA384</code>, <code class="code">SHA512</code>, <code class="code">CRC32</code> and <code class="code">adler32</code>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-7" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-7">
|
|
<h4 class="subsection">4.16.1 Examples</h4>
|
|
|
|
<p>To compute the SHA-256 hash of the input converted to raw audio and
|
|
video, and store it in the file <samp class="file">out.sha256</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f hash out.sha256
|
|
</pre></div>
|
|
|
|
<p>To print an MD5 hash to stdout use the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f hash -hash md5 -
|
|
</pre></div>
|
|
|
|
<p>See also the <a class="ref" href="#framehash">framehash</a> muxer.
|
|
</p>
|
|
<a class="anchor" id="hls"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="hls-2">
|
|
<h3 class="section">4.17 hls</h3>
|
|
|
|
<p>Apple HTTP Live Streaming muxer that segments MPEG-TS according to
|
|
the HTTP Live Streaming (HLS) specification.
|
|
</p>
|
|
<p>It creates a playlist file, and one or more segment files. The output filename
|
|
specifies the playlist filename.
|
|
</p>
|
|
<p>By default, the muxer creates a file for each segment produced. These files
|
|
have the same name as the playlist, followed by a sequential number and a
|
|
.ts extension.
|
|
</p>
|
|
<p>Make sure to require a closed GOP when encoding and to set the GOP
|
|
size to fit your segment time constraint.
|
|
</p>
|
|
<p>For example, to convert an input file with <code class="command">ffmpeg</code>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -c:v h264 -flags +cgop -g 30 -hls_time 1 out.m3u8
|
|
</pre></div>
|
|
<p>This example will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
|
|
<samp class="file">out0.ts</samp>, <samp class="file">out1.ts</samp>, <samp class="file">out2.ts</samp>, etc.
|
|
</p>
|
|
<p>See also the <a class="ref" href="#segment">segment</a> muxer, which provides a more generic and
|
|
flexible implementation of a segmenter, and can be used to perform HLS
|
|
segmentation.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-10" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-10">
|
|
<h4 class="subsection">4.17.1 Options</h4>
|
|
|
|
<p>This muxer supports the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">hls_init_time <var class="var">duration</var></samp></dt>
|
|
<dd><p>Set the initial target segment length. Default value is <var class="var">0</var>.
|
|
</p>
|
|
<p><var class="var">duration</var> must be a time duration specification,
|
|
see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">(ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual</a>.
|
|
</p>
|
|
<p>Segment will be cut on the next key frame after this time has passed on the first m3u8 list.
|
|
After the initial playlist is filled <code class="command">ffmpeg</code> will cut segments
|
|
at duration equal to <code class="code">hls_time</code>
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_time <var class="var">duration</var></samp></dt>
|
|
<dd><p>Set the target segment length. Default value is 2.
|
|
</p>
|
|
<p><var class="var">duration</var> must be a time duration specification,
|
|
see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">(ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual</a>.
|
|
Segment will be cut on the next key frame after this time has passed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_list_size <var class="var">size</var></samp></dt>
|
|
<dd><p>Set the maximum number of playlist entries. If set to 0 the list file
|
|
will contain all the segments. Default value is 5.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_delete_threshold <var class="var">size</var></samp></dt>
|
|
<dd><p>Set the number of unreferenced segments to keep on disk before <code class="code">hls_flags delete_segments</code>
|
|
deletes them. Increase this to allow continue clients to download segments which
|
|
were recently referenced in the playlist. Default value is 1, meaning segments older than
|
|
<code class="code">hls_list_size+1</code> will be deleted.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_start_number_source</samp></dt>
|
|
<dd><p>Start the playlist sequence number (<code class="code">#EXT-X-MEDIA-SEQUENCE</code>) according to the specified source.
|
|
Unless <code class="code">hls_flags single_file</code> is set, it also specifies source of starting sequence numbers of
|
|
segment and subtitle filenames. In any case, if <code class="code">hls_flags append_list</code>
|
|
is set and read playlist sequence number is greater than the specified start sequence number,
|
|
then that value will be used as start value.
|
|
</p>
|
|
<p>It accepts the following values:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">generic (default)</samp></dt>
|
|
<dd><p>Set the starting sequence numbers according to <var class="var">start_number</var> option value.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">epoch</samp></dt>
|
|
<dd><p>The start number will be the seconds since epoch (1970-01-01 00:00:00)
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">epoch_us</samp></dt>
|
|
<dd><p>The start number will be the microseconds since epoch (1970-01-01 00:00:00)
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">datetime</samp></dt>
|
|
<dd><p>The start number will be based on the current date/time as YYYYmmddHHMMSS. e.g. 20161231235759.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">start_number <var class="var">number</var></samp></dt>
|
|
<dd><p>Start the playlist sequence number (<code class="code">#EXT-X-MEDIA-SEQUENCE</code>) from the specified <var class="var">number</var>
|
|
when <var class="var">hls_start_number_source</var> value is <var class="var">generic</var>. (This is the default case.)
|
|
Unless <code class="code">hls_flags single_file</code> is set, it also specifies starting sequence numbers of segment and subtitle filenames.
|
|
Default value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_allow_cache <var class="var">allowcache</var></samp></dt>
|
|
<dd><p>Explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_base_url <var class="var">baseurl</var></samp></dt>
|
|
<dd><p>Append <var class="var">baseurl</var> to every entry in the playlist.
|
|
Useful to generate playlists with absolute paths.
|
|
</p>
|
|
<p>Note that the playlist sequence number must be unique for each segment
|
|
and it is not to be confused with the segment filename sequence number
|
|
which can be cyclic, for example if the <samp class="option">wrap</samp> option is
|
|
specified.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_segment_filename <var class="var">filename</var></samp></dt>
|
|
<dd><p>Set the segment filename. Unless <code class="code">hls_flags single_file</code> is set,
|
|
<var class="var">filename</var> is used as a string format with the segment number:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts' out.m3u8
|
|
</pre></div>
|
|
<p>This example will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
|
|
<samp class="file">file000.ts</samp>, <samp class="file">file001.ts</samp>, <samp class="file">file002.ts</samp>, etc.
|
|
</p>
|
|
<p><var class="var">filename</var> may contain full path or relative path specification,
|
|
but only the file name part without any path info will be contained in the m3u8 segment list.
|
|
Should a relative path be specified, the path of the created segment
|
|
files will be relative to the current working directory.
|
|
When strftime_mkdir is set, the whole expanded value of <var class="var">filename</var> will be written into the m3u8 segment list.
|
|
</p>
|
|
<p>When <code class="code">var_stream_map</code> is set with two or more variant streams, the
|
|
<var class="var">filename</var> pattern must contain the string "%v", this string specifies
|
|
the position of variant stream index in the generated segment file names.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
-hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example will produce the playlists segment file sets:
|
|
<samp class="file">file_0_000.ts</samp>, <samp class="file">file_0_001.ts</samp>, <samp class="file">file_0_002.ts</samp>, etc. and
|
|
<samp class="file">file_1_000.ts</samp>, <samp class="file">file_1_001.ts</samp>, <samp class="file">file_1_002.ts</samp>, etc.
|
|
</p>
|
|
<p>The string "%v" may be present in the filename or in the last directory name
|
|
containing the file, but only in one of them. (Additionally, %v may appear multiple times in the last
|
|
sub-directory or filename.) If the string %v is present in the directory name, then
|
|
sub-directories are created after expanding the directory name pattern. This
|
|
enables creation of segments corresponding to different variant streams in
|
|
subdirectories.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
-hls_segment_filename 'vs%v/file_%03d.ts' vs%v/out.m3u8
|
|
</pre></div>
|
|
<p>This example will produce the playlists segment file sets:
|
|
<samp class="file">vs0/file_000.ts</samp>, <samp class="file">vs0/file_001.ts</samp>, <samp class="file">vs0/file_002.ts</samp>, etc. and
|
|
<samp class="file">vs1/file_000.ts</samp>, <samp class="file">vs1/file_001.ts</samp>, <samp class="file">vs1/file_002.ts</samp>, etc.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">strftime</samp></dt>
|
|
<dd><p>Use strftime() on <var class="var">filename</var> to expand the segment filename with localtime.
|
|
The segment number is also available in this mode, but to use it, you need to specify second_level_segment_index
|
|
hls_flag and %%d will be the specifier.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8
|
|
</pre></div>
|
|
<p>This example will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
|
|
<samp class="file">file-20160215-1455569023.ts</samp>, <samp class="file">file-20160215-1455569024.ts</samp>, etc.
|
|
Note: On some systems/environments, the <code class="code">%s</code> specifier is not available. See
|
|
<code class="code">strftime()</code> documentation.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -hls_flags second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts' out.m3u8
|
|
</pre></div>
|
|
<p>This example will produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
|
|
<samp class="file">file-20160215-0001.ts</samp>, <samp class="file">file-20160215-0002.ts</samp>, etc.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">strftime_mkdir</samp></dt>
|
|
<dd><p>Used together with -strftime_mkdir, it will create all subdirectories which
|
|
is expanded in <var class="var">filename</var>.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8
|
|
</pre></div>
|
|
<p>This example will create a directory 201560215 (if it does not exist), and then
|
|
produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
|
|
<samp class="file">20160215/file-20160215-1455569023.ts</samp>, <samp class="file">20160215/file-20160215-1455569024.ts</samp>, etc.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8
|
|
</pre></div>
|
|
<p>This example will create a directory hierarchy 2016/02/15 (if any of them do not exist), and then
|
|
produce the playlist, <samp class="file">out.m3u8</samp>, and segment files:
|
|
<samp class="file">2016/02/15/file-20160215-1455569023.ts</samp>, <samp class="file">2016/02/15/file-20160215-1455569024.ts</samp>, etc.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_segment_options <var class="var">options_list</var></samp></dt>
|
|
<dd><p>Set output format options using a :-separated list of key=value
|
|
parameters. Values containing <code class="code">:</code> special characters must be
|
|
escaped.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_key_info_file <var class="var">key_info_file</var></samp></dt>
|
|
<dd><p>Use the information in <var class="var">key_info_file</var> for segment encryption. The first
|
|
line of <var class="var">key_info_file</var> specifies the key URI written to the playlist. The
|
|
key URL is used to access the encryption key during playback. The second line
|
|
specifies the path to the key file used to obtain the key during the encryption
|
|
process. The key file is read as a single packed array of 16 octets in binary
|
|
format. The optional third line specifies the initialization vector (IV) as a
|
|
hexadecimal string to be used instead of the segment sequence number (default)
|
|
for encryption. Changes to <var class="var">key_info_file</var> will result in segment
|
|
encryption with the new key/IV and an entry in the playlist for the new key
|
|
URI/IV if <code class="code">hls_flags periodic_rekey</code> is enabled.
|
|
</p>
|
|
<p>Key info file format:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted"><var class="var">key URI</var>
|
|
<var class="var">key file path</var>
|
|
<var class="var">IV</var> (optional)
|
|
</pre></div>
|
|
|
|
<p>Example key URIs:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">http://server/file.key
|
|
/path/to/file.key
|
|
file.key
|
|
</pre></div>
|
|
|
|
<p>Example key file paths:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">file.key
|
|
/path/to/file.key
|
|
</pre></div>
|
|
|
|
<p>Example IV:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">0123456789ABCDEF0123456789ABCDEF
|
|
</pre></div>
|
|
|
|
<p>Key info file example:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">http://server/file.key
|
|
/path/to/file.key
|
|
0123456789ABCDEF0123456789ABCDEF
|
|
</pre></div>
|
|
|
|
<p>Example shell script:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">#!/bin/sh
|
|
BASE_URL=${1:-'.'}
|
|
openssl rand 16 > file.key
|
|
echo $BASE_URL/file.key > file.keyinfo
|
|
echo file.key >> file.keyinfo
|
|
echo $(openssl rand -hex 16) >> file.keyinfo
|
|
ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
|
|
-hls_key_info_file file.keyinfo out.m3u8
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp class="option">-hls_enc <var class="var">enc</var></samp></dt>
|
|
<dd><p>Enable (1) or disable (0) the AES128 encryption.
|
|
When enabled every segment generated is encrypted and the encryption key
|
|
is saved as <var class="var">playlist name</var>.key.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-hls_enc_key <var class="var">key</var></samp></dt>
|
|
<dd><p>16-octet key to encrypt the segments, by default it
|
|
is randomly generated.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-hls_enc_key_url <var class="var">keyurl</var></samp></dt>
|
|
<dd><p>If set, <var class="var">keyurl</var> is prepended instead of <var class="var">baseurl</var> to the key filename
|
|
in the playlist.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-hls_enc_iv <var class="var">iv</var></samp></dt>
|
|
<dd><p>16-octet initialization vector for every segment instead
|
|
of the autogenerated ones.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_segment_type <var class="var">flags</var></samp></dt>
|
|
<dd><p>Possible values:
|
|
</p>
|
|
<dl class="table">
|
|
<dt>‘<samp class="samp">mpegts</samp>’</dt>
|
|
<dd><p>Output segment files in MPEG-2 Transport Stream format. This is
|
|
compatible with all HLS versions.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">fmp4</samp>’</dt>
|
|
<dd><p>Output segment files in fragmented MP4 format, similar to MPEG-DASH.
|
|
fmp4 files may be used in HLS version 7 and above.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">hls_fmp4_init_filename <var class="var">filename</var></samp></dt>
|
|
<dd><p>Set filename to the fragment files header file, default filename is <samp class="file">init.mp4</samp>.
|
|
</p>
|
|
<p>Use <code class="code">-strftime 1</code> on <var class="var">filename</var> to expand the segment filename with localtime.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -hls_segment_type fmp4 -strftime 1 -hls_fmp4_init_filename "%s_init.mp4" out.m3u8
|
|
</pre></div>
|
|
<p>This will produce init like this
|
|
<samp class="file">1602678741_init.mp4</samp>
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_fmp4_init_resend</samp></dt>
|
|
<dd><p>Resend init file after m3u8 file refresh every time, default is <var class="var">0</var>.
|
|
</p>
|
|
<p>When <code class="code">var_stream_map</code> is set with two or more variant streams, the
|
|
<var class="var">filename</var> pattern must contain the string "%v", this string specifies
|
|
the position of variant stream index in the generated init file names.
|
|
The string "%v" may be present in the filename or in the last directory name
|
|
containing the file. If the string is present in the directory name, then
|
|
sub-directories are created after expanding the directory name pattern. This
|
|
enables creation of init files corresponding to different variant streams in
|
|
subdirectories.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_flags <var class="var">flags</var></samp></dt>
|
|
<dd><p>Possible values:
|
|
</p>
|
|
<dl class="table">
|
|
<dt>‘<samp class="samp">single_file</samp>’</dt>
|
|
<dd><p>If this flag is set, the muxer will store all segments in a single MPEG-TS
|
|
file, and will use byte ranges in the playlist. HLS playlists generated with
|
|
this way will have the version number 4.
|
|
For example:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.nut -hls_flags single_file out.m3u8
|
|
</pre></div>
|
|
<p>Will produce the playlist, <samp class="file">out.m3u8</samp>, and a single segment file,
|
|
<samp class="file">out.ts</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">delete_segments</samp>’</dt>
|
|
<dd><p>Segment files removed from the playlist are deleted after a period of time
|
|
equal to the duration of the segment plus the duration of the playlist.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">append_list</samp>’</dt>
|
|
<dd><p>Append new segments into the end of old segment list,
|
|
and remove the <code class="code">#EXT-X-ENDLIST</code> from the old segment list.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">round_durations</samp>’</dt>
|
|
<dd><p>Round the duration info in the playlist file segment info to integer
|
|
values, instead of using floating point.
|
|
If there are no other features requiring higher HLS versions be used,
|
|
then this will allow ffmpeg to output a HLS version 2 m3u8.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">discont_start</samp>’</dt>
|
|
<dd><p>Add the <code class="code">#EXT-X-DISCONTINUITY</code> tag to the playlist, before the
|
|
first segment’s information.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">omit_endlist</samp>’</dt>
|
|
<dd><p>Do not append the <code class="code">EXT-X-ENDLIST</code> tag at the end of the playlist.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">periodic_rekey</samp>’</dt>
|
|
<dd><p>The file specified by <code class="code">hls_key_info_file</code> will be checked periodically and
|
|
detect updates to the encryption info. Be sure to replace this file atomically,
|
|
including the file containing the AES encryption key.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">independent_segments</samp>’</dt>
|
|
<dd><p>Add the <code class="code">#EXT-X-INDEPENDENT-SEGMENTS</code> to playlists that has video segments
|
|
and when all the segments of that playlist are guaranteed to start with a Key frame.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">iframes_only</samp>’</dt>
|
|
<dd><p>Add the <code class="code">#EXT-X-I-FRAMES-ONLY</code> to playlists that has video segments
|
|
and can play only I-frames in the <code class="code">#EXT-X-BYTERANGE</code> mode.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">split_by_time</samp>’</dt>
|
|
<dd><p>Allow segments to start on frames other than keyframes. This improves
|
|
behavior on some players when the time between keyframes is inconsistent,
|
|
but may make things worse on others, and can cause some oddities during
|
|
seeking. This flag should be used with the <code class="code">hls_time</code> option.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">program_date_time</samp>’</dt>
|
|
<dd><p>Generate <code class="code">EXT-X-PROGRAM-DATE-TIME</code> tags.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">second_level_segment_index</samp>’</dt>
|
|
<dd><p>Makes it possible to use segment indexes as %%d in hls_segment_filename expression
|
|
besides date/time values when strftime is on.
|
|
To get fixed width numbers with trailing zeroes, %%0xd format is available where x is the required width.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">second_level_segment_size</samp>’</dt>
|
|
<dd><p>Makes it possible to use segment sizes (counted in bytes) as %%s in hls_segment_filename
|
|
expression besides date/time values when strftime is on.
|
|
To get fixed width numbers with trailing zeroes, %%0xs format is available where x is the required width.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">second_level_segment_duration</samp>’</dt>
|
|
<dd><p>Makes it possible to use segment duration (calculated in microseconds) as %%t in hls_segment_filename
|
|
expression besides date/time values when strftime is on.
|
|
To get fixed width numbers with trailing zeroes, %%0xt format is available where x is the required width.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i sample.mpeg \
|
|
-f hls -hls_time 3 -hls_list_size 5 \
|
|
-hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration \
|
|
-strftime 1 -strftime_mkdir 1 -hls_segment_filename "segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8
|
|
</pre></div>
|
|
<p>This will produce segments like this:
|
|
<samp class="file">segment_20170102194334_0003_00122200_0000003000000.ts</samp>, <samp class="file">segment_20170102194334_0004_00120072_0000003000000.ts</samp> etc.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">temp_file</samp>’</dt>
|
|
<dd><p>Write segment data to filename.tmp and rename to filename only once the segment is complete. A webserver
|
|
serving up segments can be configured to reject requests to *.tmp to prevent access to in-progress segments
|
|
before they have been added to the m3u8 playlist. This flag also affects how m3u8 playlist files are created.
|
|
If this flag is set, all playlist files will written into temporary file and renamed after they are complete, similarly as segments are handled.
|
|
But playlists with <code class="code">file</code> protocol and with type (<code class="code">hls_playlist_type</code>) other than <code class="code">vod</code>
|
|
are always written into temporary file regardless of this flag. Master playlist files (<code class="code">master_pl_name</code>), if any, with <code class="code">file</code> protocol,
|
|
are always written into temporary file regardless of this flag if <code class="code">master_pl_publish_rate</code> value is other than zero.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">hls_playlist_type event</samp></dt>
|
|
<dd><p>Emit <code class="code">#EXT-X-PLAYLIST-TYPE:EVENT</code> in the m3u8 header. Forces
|
|
<samp class="option">hls_list_size</samp> to 0; the playlist can only be appended to.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">hls_playlist_type vod</samp></dt>
|
|
<dd><p>Emit <code class="code">#EXT-X-PLAYLIST-TYPE:VOD</code> in the m3u8 header. Forces
|
|
<samp class="option">hls_list_size</samp> to 0; the playlist must not change.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">method</samp></dt>
|
|
<dd><p>Use the given HTTP method to create the hls files.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8
|
|
</pre></div>
|
|
<p>This example will upload all the mpegts segment files to the HTTP
|
|
server using the HTTP PUT method, and update the m3u8 files every
|
|
<code class="code">refresh</code> times using the same method.
|
|
Note that the HTTP server must support the given method for uploading
|
|
files.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">http_user_agent</samp></dt>
|
|
<dd><p>Override User-Agent field in HTTP header. Applicable only for HTTP output.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">var_stream_map</samp></dt>
|
|
<dd><p>Map string which specifies how to group the audio, video and subtitle streams
|
|
into different variant streams. The variant stream groups are separated
|
|
by space.
|
|
Expected string format is like this "a:0,v:0 a:1,v:1 ....". Here a:, v:, s: are
|
|
the keys to specify audio, video and subtitle streams respectively.
|
|
Allowed values are 0 to 9 (limited just based on practical usage).
|
|
</p>
|
|
<p>When there are two or more variant streams, the output filename pattern must
|
|
contain the string "%v", this string specifies the position of variant stream
|
|
index in the output media playlist filenames. The string "%v" may be present in
|
|
the filename or in the last directory name containing the file. If the string is
|
|
present in the directory name, then sub-directories are created after expanding
|
|
the directory name pattern. This enables creation of variant streams in
|
|
subdirectories.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example creates two hls variant streams. The first variant stream will
|
|
contain video stream of bitrate 1000k and audio stream of bitrate 64k and the
|
|
second variant stream will contain video stream of bitrate 256k and audio
|
|
stream of bitrate 32k. Here, two media playlist with file names out_0.m3u8 and
|
|
out_1.m3u8 will be created. If you want something meaningful text instead of indexes
|
|
in result names, you may specify names for each or some of the variants
|
|
as in the following example.
|
|
</p>
|
|
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0,name:my_hd v:1,a:1,name:my_sd" \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
|
|
<p>This example creates two hls variant streams as in the previous one.
|
|
But here, the two media playlist with file names out_my_hd.m3u8 and
|
|
out_my_sd.m3u8 will be created.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k \
|
|
-map 0:v -map 0:a -map 0:v -f hls -var_stream_map "v:0 a:0 v:1" \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example creates three hls variant streams. The first variant stream will
|
|
be a video only stream with video bitrate 1000k, the second variant stream will
|
|
be an audio only stream with bitrate 64k and the third variant stream will be a
|
|
video only stream with bitrate 256k. Here, three media playlist with file names
|
|
out_0.m3u8, out_1.m3u8 and out_2.m3u8 will be created.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
|
|
http://example.com/live/vs_%v/out.m3u8
|
|
</pre></div>
|
|
<p>This example creates the variant streams in subdirectories. Here, the first
|
|
media playlist is created at <samp class="file">http://example.com/live/vs_0/out.m3u8</samp> and
|
|
the second one at <samp class="file">http://example.com/live/vs_1/out.m3u8</samp>.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k \
|
|
-map 0:a -map 0:a -map 0:v -map 0:v -f hls \
|
|
-var_stream_map "a:0,agroup:aud_low a:1,agroup:aud_high v:0,agroup:aud_low v:1,agroup:aud_high" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example creates two audio only and two video only variant streams. In
|
|
addition to the #EXT-X-STREAM-INF tag for each variant stream in the master
|
|
playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams
|
|
and they are mapped to the two video only variant streams with audio group names
|
|
’aud_low’ and ’aud_high’.
|
|
</p>
|
|
<p>By default, a single hls variant containing all the encoded streams is created.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
|
|
-map 0:a -map 0:a -map 0:v -f hls \
|
|
-var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low v:0,agroup:aud_low" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example creates two audio only and one video only variant streams. In
|
|
addition to the #EXT-X-STREAM-INF tag for each variant stream in the master
|
|
playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams
|
|
and they are mapped to the one video only variant streams with audio group name
|
|
’aud_low’, and the audio group have default stat is NO or YES.
|
|
</p>
|
|
<p>By default, a single hls variant containing all the encoded streams is created.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
|
|
-map 0:a -map 0:a -map 0:v -f hls \
|
|
-var_stream_map "a:0,agroup:aud_low,default:yes,language:ENG a:1,agroup:aud_low,language:CHN v:0,agroup:aud_low" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example creates two audio only and one video only variant streams. In
|
|
addition to the #EXT-X-STREAM-INF tag for each variant stream in the master
|
|
playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams
|
|
and they are mapped to the one video only variant streams with audio group name
|
|
’aud_low’, and the audio group have default stat is NO or YES, and one audio
|
|
have and language is named ENG, the other audio language is named CHN.
|
|
</p>
|
|
<p>By default, a single hls variant containing all the encoded streams is created.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -y -i input_with_subtitle.mkv \
|
|
-b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
|
|
-b:a:0 256k \
|
|
-c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
|
|
-f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
|
|
-master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
|
|
10 -master_pl_publish_rate 10 -hls_flags \
|
|
delete_segments+discont_start+split_by_time ./tmp/video.m3u8
|
|
</pre></div>
|
|
|
|
<p>This example adds <code class="code">#EXT-X-MEDIA</code> tag with <code class="code">TYPE=SUBTITLES</code> in
|
|
the master playlist with webvtt subtitle group name ’subtitle’. Please make sure
|
|
the input file has one text subtitle stream at least.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">cc_stream_map</samp></dt>
|
|
<dd><p>Map string which specifies different closed captions groups and their
|
|
attributes. The closed captions stream groups are separated by space.
|
|
Expected string format is like this
|
|
"ccgroup:<group name>,instreamid:<INSTREAM-ID>,language:<language code> ....".
|
|
’ccgroup’ and ’instreamid’ are mandatory attributes. ’language’ is an optional
|
|
attribute.
|
|
The closed captions groups configured using this option are mapped to different
|
|
variant streams by providing the same ’ccgroup’ name in the
|
|
<code class="code">var_stream_map</code> string. If <code class="code">var_stream_map</code> is not set, then the
|
|
first available ccgroup in <code class="code">cc_stream_map</code> is mapped to the output variant
|
|
stream. The examples for these two use cases are given below.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \
|
|
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out.m3u8
|
|
</pre></div>
|
|
<p>This example adds <code class="code">#EXT-X-MEDIA</code> tag with <code class="code">TYPE=CLOSED-CAPTIONS</code> in
|
|
the master playlist with group name ’cc’, language ’en’ (english) and
|
|
INSTREAM-ID ’CC1’. Also, it adds <code class="code">CLOSED-CAPTIONS</code> attribute with group
|
|
name ’cc’ for the output variant stream.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
|
|
-a53cc:0 1 -a53cc:1 1\
|
|
-map 0:v -map 0:a -map 0:v -map 0:a -f hls \
|
|
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp" \
|
|
-var_stream_map "v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc" \
|
|
-master_pl_name master.m3u8 \
|
|
http://example.com/live/out_%v.m3u8
|
|
</pre></div>
|
|
<p>This example adds two <code class="code">#EXT-X-MEDIA</code> tags with <code class="code">TYPE=CLOSED-CAPTIONS</code> in
|
|
the master playlist for the INSTREAM-IDs ’CC1’ and ’CC2’. Also, it adds
|
|
<code class="code">CLOSED-CAPTIONS</code> attribute with group name ’cc’ for the two output variant
|
|
streams.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">master_pl_name</samp></dt>
|
|
<dd><p>Create HLS master playlist with the given name.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 http://example.com/live/out.m3u8
|
|
</pre></div>
|
|
<p>This example creates HLS master playlist with name master.m3u8 and it is
|
|
published at http://example.com/live/
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">master_pl_publish_rate</samp></dt>
|
|
<dd><p>Publish master play list repeatedly every after specified number of segment intervals.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 \
|
|
-hls_time 2 -master_pl_publish_rate 30 http://example.com/live/out.m3u8
|
|
</pre></div>
|
|
|
|
<p>This example creates HLS master playlist with name master.m3u8 and keep
|
|
publishing it repeatedly every after 30 segments i.e. every after 60s.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">http_persistent</samp></dt>
|
|
<dd><p>Use persistent HTTP connections. Applicable only for HTTP output.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">timeout</samp></dt>
|
|
<dd><p>Set timeout for socket I/O operations. Applicable only for HTTP output.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-ignore_io_errors</samp></dt>
|
|
<dd><p>Ignore IO errors during open, write and delete. Useful for long-duration runs with network output.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">headers</samp></dt>
|
|
<dd><p>Set custom HTTP headers, can override built in default headers. Applicable only for HTTP output.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="ico"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="ico-1">
|
|
<h3 class="section">4.18 ico</h3>
|
|
|
|
<p>ICO file muxer.
|
|
</p>
|
|
<p>Microsoft’s icon file format (ICO) has some strict limitations that should be noted:
|
|
</p>
|
|
<ul class="itemize mark-bullet">
|
|
<li>Size cannot exceed 256 pixels in any dimension
|
|
|
|
</li><li>Only BMP and PNG images can be stored
|
|
|
|
</li><li>If a BMP image is used, it must be one of the following pixel formats:
|
|
<div class="example">
|
|
<pre class="example-preformatted">BMP Bit Depth FFmpeg Pixel Format
|
|
1bit pal8
|
|
4bit pal8
|
|
8bit pal8
|
|
16bit rgb555le
|
|
24bit bgr24
|
|
32bit bgra
|
|
</pre></div>
|
|
|
|
</li><li>If a BMP image is used, it must use the BITMAPINFOHEADER DIB header
|
|
|
|
</li><li>If a PNG image is used, it must use the rgba pixel format
|
|
</li></ul>
|
|
|
|
<a class="anchor" id="image2"></a></div>
|
|
<div class="section-level-extent" id="image2-2">
|
|
<h3 class="section">4.19 image2</h3>
|
|
|
|
<p>Image file muxer.
|
|
</p>
|
|
<p>The image file muxer writes video frames to image files.
|
|
</p>
|
|
<p>The output filenames are specified by a pattern, which can be used to
|
|
produce sequentially numbered series of files.
|
|
The pattern may contain the string "%d" or "%0<var class="var">N</var>d", this string
|
|
specifies the position of the characters representing a numbering in
|
|
the filenames. If the form "%0<var class="var">N</var>d" is used, the string
|
|
representing the number in each filename is 0-padded to <var class="var">N</var>
|
|
digits. The literal character ’%’ can be specified in the pattern with
|
|
the string "%%".
|
|
</p>
|
|
<p>If the pattern contains "%d" or "%0<var class="var">N</var>d", the first filename of
|
|
the file list specified will contain the number 1, all the following
|
|
numbers will be sequential.
|
|
</p>
|
|
<p>The pattern may contain a suffix which is used to automatically
|
|
determine the format of the image files to write.
|
|
</p>
|
|
<p>For example the pattern "img-%03d.bmp" will specify a sequence of
|
|
filenames of the form <samp class="file">img-001.bmp</samp>, <samp class="file">img-002.bmp</samp>, ...,
|
|
<samp class="file">img-010.bmp</samp>, etc.
|
|
The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
|
|
form <samp class="file">img%-1.jpg</samp>, <samp class="file">img%-2.jpg</samp>, ..., <samp class="file">img%-10.jpg</samp>,
|
|
etc.
|
|
</p>
|
|
<p>The image muxer supports the .Y.U.V image file format. This format is
|
|
special in that that each image frame consists of three files, for
|
|
each of the YUV420P components. To read or write this image file format,
|
|
specify the name of the ’.Y’ file. The muxer will automatically open the
|
|
’.U’ and ’.V’ files as required.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-11" accesskey="1">Options</a></li>
|
|
<li><a href="#Examples-8" accesskey="2">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-11">
|
|
<h4 class="subsection">4.19.1 Options</h4>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">frame_pts</samp></dt>
|
|
<dd><p>If set to 1, expand the filename with pts from pkt->pts.
|
|
Default value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">start_number</samp></dt>
|
|
<dd><p>Start the sequence from the specified number. Default value is 1.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">update</samp></dt>
|
|
<dd><p>If set to 1, the filename will always be interpreted as just a
|
|
filename, not a pattern, and the corresponding file will be continuously
|
|
overwritten with new images. Default value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">strftime</samp></dt>
|
|
<dd><p>If set to 1, expand the filename with date and time information from
|
|
<code class="code">strftime()</code>. Default value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">atomic_writing</samp></dt>
|
|
<dd><p>Write output to a temporary file, which is renamed to target filename once
|
|
writing is completed. Default is disabled.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">protocol_opts <var class="var">options_list</var></samp></dt>
|
|
<dd><p>Set protocol options as a :-separated list of key=value parameters. Values
|
|
containing the <code class="code">:</code> special character must be escaped.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Examples-8">
|
|
<h4 class="subsection">4.19.2 Examples</h4>
|
|
|
|
<p>The following example shows how to use <code class="command">ffmpeg</code> for creating a
|
|
sequence of files <samp class="file">img-001.jpeg</samp>, <samp class="file">img-002.jpeg</samp>, ...,
|
|
taking one image every second from the input video:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.avi -vsync cfr -r 1 -f image2 'img-%03d.jpeg'
|
|
</pre></div>
|
|
|
|
<p>Note that with <code class="command">ffmpeg</code>, if the format is not specified with the
|
|
<code class="code">-f</code> option and the output filename specifies an image file
|
|
format, the image2 muxer is automatically selected, so the previous
|
|
command can be written as:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.avi -vsync cfr -r 1 'img-%03d.jpeg'
|
|
</pre></div>
|
|
|
|
<p>Note also that the pattern must not necessarily contain "%d" or
|
|
"%0<var class="var">N</var>d", for example to create a single image file
|
|
<samp class="file">img.jpeg</samp> from the start of the input video you can employ the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
|
|
</pre></div>
|
|
|
|
<p>The <samp class="option">strftime</samp> option allows you to expand the filename with
|
|
date and time information. Check the documentation of
|
|
the <code class="code">strftime()</code> function for the syntax.
|
|
</p>
|
|
<p>For example to generate image files from the <code class="code">strftime()</code>
|
|
"%Y-%m-%d_%H-%M-%S" pattern, the following <code class="command">ffmpeg</code> command
|
|
can be used:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
|
|
</pre></div>
|
|
|
|
<p>You can set the file name with current frame’s PTS:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -frame_pts true %d.jpg
|
|
</pre></div>
|
|
|
|
<p>A more complex example is to publish contents of your desktop directly to a
|
|
WebDAV server every second:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg
|
|
</pre></div>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="matroska">
|
|
<h3 class="section">4.20 matroska</h3>
|
|
|
|
<p>Matroska container muxer.
|
|
</p>
|
|
<p>This muxer implements the matroska and webm container specs.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Metadata" accesskey="1">Metadata</a></li>
|
|
<li><a href="#Options-12" accesskey="2">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Metadata">
|
|
<h4 class="subsection">4.20.1 Metadata</h4>
|
|
|
|
<p>The recognized metadata settings in this muxer are:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">title</samp></dt>
|
|
<dd><p>Set title name provided to a single track. This gets mapped to
|
|
the FileDescription element for a stream written as attachment.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">language</samp></dt>
|
|
<dd><p>Specify the language of the track in the Matroska languages form.
|
|
</p>
|
|
<p>The language can be either the 3 letters bibliographic ISO-639-2 (ISO
|
|
639-2/B) form (like "fre" for French), or a language code mixed with a
|
|
country code for specialities in languages (like "fre-ca" for Canadian
|
|
French).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">stereo_mode</samp></dt>
|
|
<dd><p>Set stereo 3D video layout of two views in a single video track.
|
|
</p>
|
|
<p>The following values are recognized:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">mono</samp>’</dt>
|
|
<dd><p>video is not stereo
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">left_right</samp>’</dt>
|
|
<dd><p>Both views are arranged side by side, Left-eye view is on the left
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">bottom_top</samp>’</dt>
|
|
<dd><p>Both views are arranged in top-bottom orientation, Left-eye view is at bottom
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">top_bottom</samp>’</dt>
|
|
<dd><p>Both views are arranged in top-bottom orientation, Left-eye view is on top
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">checkerboard_rl</samp>’</dt>
|
|
<dd><p>Each view is arranged in a checkerboard interleaved pattern, Left-eye view being first
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">checkerboard_lr</samp>’</dt>
|
|
<dd><p>Each view is arranged in a checkerboard interleaved pattern, Right-eye view being first
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">row_interleaved_rl</samp>’</dt>
|
|
<dd><p>Each view is constituted by a row based interleaving, Right-eye view is first row
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">row_interleaved_lr</samp>’</dt>
|
|
<dd><p>Each view is constituted by a row based interleaving, Left-eye view is first row
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">col_interleaved_rl</samp>’</dt>
|
|
<dd><p>Both views are arranged in a column based interleaving manner, Right-eye view is first column
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">col_interleaved_lr</samp>’</dt>
|
|
<dd><p>Both views are arranged in a column based interleaving manner, Left-eye view is first column
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">anaglyph_cyan_red</samp>’</dt>
|
|
<dd><p>All frames are in anaglyph format viewable through red-cyan filters
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">right_left</samp>’</dt>
|
|
<dd><p>Both views are arranged side by side, Right-eye view is on the left
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">anaglyph_green_magenta</samp>’</dt>
|
|
<dd><p>All frames are in anaglyph format viewable through green-magenta filters
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">block_lr</samp>’</dt>
|
|
<dd><p>Both eyes laced in one Block, Left-eye view is first
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">block_rl</samp>’</dt>
|
|
<dd><p>Both eyes laced in one Block, Right-eye view is first
|
|
</p></dd>
|
|
</dl>
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>For example a 3D WebM clip can be created using the following command line:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i sample_left_right_clip.mpg -an -c:v libvpx -metadata stereo_mode=left_right -y stereo_clip.webm
|
|
</pre></div>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Options-12">
|
|
<h4 class="subsection">4.20.2 Options</h4>
|
|
|
|
<p>This muxer supports the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">reserve_index_space</samp></dt>
|
|
<dd><p>By default, this muxer writes the index for seeking (called cues in Matroska
|
|
terms) at the end of the file, because it cannot know in advance how much space
|
|
to leave for the index at the beginning of the file. However for some use cases
|
|
– e.g. streaming where seeking is possible but slow – it is useful to put the
|
|
index at the beginning of the file.
|
|
</p>
|
|
<p>If this option is set to a non-zero value, the muxer will reserve a given amount
|
|
of space in the file header and then try to write the cues there when the muxing
|
|
finishes. If the reserved space does not suffice, no Cues will be written, the
|
|
file will be finalized and writing the trailer will return an error.
|
|
A safe size for most use cases should be about 50kB per hour of video.
|
|
</p>
|
|
<p>Note that cues are only written if the output is seekable and this option will
|
|
have no effect if it is not.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">cues_to_front</samp></dt>
|
|
<dd><p>If set, the muxer will write the index at the beginning of the file
|
|
by shifting the main data if necessary. This can be combined with
|
|
reserve_index_space in which case the data is only shifted if
|
|
the initially reserved space turns out to be insufficient.
|
|
</p>
|
|
<p>This option is ignored if the output is unseekable.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">default_mode</samp></dt>
|
|
<dd><p>This option controls how the FlagDefault of the output tracks will be set.
|
|
It influences which tracks players should play by default. The default mode
|
|
is ‘<samp class="samp">passthrough</samp>’.
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">infer</samp>’</dt>
|
|
<dd><p>Every track with disposition default will have the FlagDefault set.
|
|
Additionally, for each type of track (audio, video or subtitle), if no track
|
|
with disposition default of this type exists, then the first track of this type
|
|
will be marked as default (if existing). This ensures that the default flag
|
|
is set in a sensible way even if the input originated from containers that
|
|
lack the concept of default tracks.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">infer_no_subs</samp>’</dt>
|
|
<dd><p>This mode is the same as infer except that if no subtitle track with
|
|
disposition default exists, no subtitle track will be marked as default.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">passthrough</samp>’</dt>
|
|
<dd><p>In this mode the FlagDefault is set if and only if the AV_DISPOSITION_DEFAULT
|
|
flag is set in the disposition of the corresponding stream.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">flipped_raw_rgb</samp></dt>
|
|
<dd><p>If set to true, store positive height for raw RGB bitmaps, which indicates
|
|
bitmap is stored bottom-up. Note that this option does not flip the bitmap
|
|
which has to be done manually beforehand, e.g. by using the vflip filter.
|
|
Default is <var class="var">false</var> and indicates bitmap is stored top down.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="md5"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="md5-1">
|
|
<h3 class="section">4.21 md5</h3>
|
|
|
|
<p>MD5 testing format.
|
|
</p>
|
|
<p>This is a variant of the <a class="ref" href="#hash">hash</a> muxer. Unlike that muxer, it
|
|
defaults to using the MD5 hash function.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-9" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-9">
|
|
<h4 class="subsection">4.21.1 Examples</h4>
|
|
|
|
<p>To compute the MD5 hash of the input converted to raw
|
|
audio and video, and store it in the file <samp class="file">out.md5</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f md5 out.md5
|
|
</pre></div>
|
|
|
|
<p>You can print the MD5 to stdout with the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f md5 -
|
|
</pre></div>
|
|
|
|
<p>See also the <a class="ref" href="#hash">hash</a> and <a class="ref" href="#framemd5">framemd5</a> muxers.
|
|
</p>
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="mov_002c-mp4_002c-ismv">
|
|
<h3 class="section">4.22 mov, mp4, ismv</h3>
|
|
|
|
<p>MOV/MP4/ISMV (Smooth Streaming) muxer.
|
|
</p>
|
|
<p>The mov/mp4/ismv muxer supports fragmentation. Normally, a MOV/MP4
|
|
file has all the metadata about all packets stored in one location
|
|
(written at the end of the file, it can be moved to the start for
|
|
better playback by adding <code class="code">+faststart</code> to the <code class="code">-movflags</code>, or
|
|
using the <code class="command">qt-faststart</code> tool).
|
|
</p>
|
|
<p>A fragmented
|
|
file consists of a number of fragments, where packets and metadata
|
|
about these packets are stored together. Writing a fragmented
|
|
file has the advantage that the file is decodable even if the
|
|
writing is interrupted (while a normal MOV/MP4 is undecodable if
|
|
it is not properly finished), and it requires less memory when writing
|
|
very long files (since writing normal MOV/MP4 files stores info about
|
|
every single packet in memory until the file is closed). The downside
|
|
is that it is less compatible with other applications.
|
|
</p>
|
|
<p>Fragmentation is enabled by setting one of the options that define
|
|
how to cut the file into fragments: <code class="code">-frag_duration</code>, <code class="code">-frag_size</code>,
|
|
<code class="code">-min_frag_duration</code>, <code class="code">-movflags +frag_keyframe</code> and
|
|
<code class="code">-movflags +frag_custom</code>. If more than one condition is specified,
|
|
fragments are cut when one of the specified conditions is fulfilled. The
|
|
exception to this is <code class="code">-min_frag_duration</code>, which has to be fulfilled for
|
|
any of the other conditions to apply.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-13" accesskey="1">Options</a></li>
|
|
<li><a href="#Example" accesskey="2">Example</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-13">
|
|
<h4 class="subsection">4.22.1 Options</h4>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">frag_duration <var class="var">duration</var></samp></dt>
|
|
<dd><p>Create fragments that are <var class="var">duration</var> microseconds long.
|
|
</p></dd>
|
|
<dt><samp class="option">frag_size <var class="var">size</var></samp></dt>
|
|
<dd><p>Create fragments that contain up to <var class="var">size</var> bytes of payload data.
|
|
</p></dd>
|
|
<dt><samp class="option">min_frag_duration <var class="var">duration</var></samp></dt>
|
|
<dd><p>Don’t create fragments that are shorter than <var class="var">duration</var> microseconds long.
|
|
</p></dd>
|
|
<dt><samp class="option">movflags <var class="var">flags</var></samp></dt>
|
|
<dd><p>Set various muxing switches. The following flags can be used:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">frag_keyframe</samp>’</dt>
|
|
<dd><p>Start a new fragment at each video keyframe.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">frag_custom</samp>’</dt>
|
|
<dd><p>Allow the caller to manually choose when to cut fragments, by
|
|
calling <code class="code">av_write_frame(ctx, NULL)</code> to write a fragment with
|
|
the packets written so far. (This is only useful with other
|
|
applications integrating libavformat, not from <code class="command">ffmpeg</code>.)
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">empty_moov</samp>’</dt>
|
|
<dd><p>Write an initial moov atom directly at the start of the file, without
|
|
describing any samples in it. Generally, an mdat/moov pair is written
|
|
at the start of the file, as a normal MOV/MP4 file, containing only
|
|
a short portion of the file. With this option set, there is no initial
|
|
mdat atom, and the moov atom only describes the tracks but has
|
|
a zero duration.
|
|
</p>
|
|
<p>This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">separate_moof</samp>’</dt>
|
|
<dd><p>Write a separate moof (movie fragment) atom for each track. Normally,
|
|
packets for all tracks are written in a moof atom (which is slightly
|
|
more efficient), but with this option set, the muxer writes one moof/mdat
|
|
pair for each track, making it easier to separate tracks.
|
|
</p>
|
|
<p>This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">skip_sidx</samp>’</dt>
|
|
<dd><p>Skip writing of sidx atom. When bitrate overhead due to sidx atom is high,
|
|
this option could be used for cases where sidx atom is not mandatory.
|
|
When global_sidx flag is enabled, this option will be ignored.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">faststart</samp>’</dt>
|
|
<dd><p>Run a second pass moving the index (moov atom) to the beginning of the file.
|
|
This operation can take a while, and will not work in various situations such
|
|
as fragmented output, thus it is not enabled by default.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">rtphint</samp>’</dt>
|
|
<dd><p>Add RTP hinting tracks to the output file.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">disable_chpl</samp>’</dt>
|
|
<dd><p>Disable Nero chapter markers (chpl atom). Normally, both Nero chapters
|
|
and a QuickTime chapter track are written to the file. With this option
|
|
set, only the QuickTime chapter track will be written. Nero chapters can
|
|
cause failures when the file is reprocessed with certain tagging programs, like
|
|
mp3Tag 2.61a and iTunes 11.3, most likely other versions are affected as well.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">omit_tfhd_offset</samp>’</dt>
|
|
<dd><p>Do not write any absolute base_data_offset in tfhd atoms. This avoids
|
|
tying fragments to absolute byte positions in the file/streams.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">default_base_moof</samp>’</dt>
|
|
<dd><p>Similarly to the omit_tfhd_offset, this flag avoids writing the
|
|
absolute base_data_offset field in tfhd atoms, but does so by using
|
|
the new default-base-is-moof flag instead. This flag is new from
|
|
14496-12:2012. This may make the fragments easier to parse in certain
|
|
circumstances (avoiding basing track fragment location calculations
|
|
on the implicit end of the previous track fragment).
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">negative_cts_offsets</samp>’</dt>
|
|
<dd><p>Enables utilization of version 1 of the CTTS box, in which the CTS offsets can
|
|
be negative. This enables the initial sample to have DTS/CTS of zero, and
|
|
reduces the need for edit lists for some cases such as video tracks with
|
|
B-frames. Additionally, eases conformance with the DASH-IF interoperability
|
|
guidelines.
|
|
</p>
|
|
<p>This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">moov_size <var class="var">bytes</var></samp></dt>
|
|
<dd><p>Reserves space for the moov atom at the beginning of the file instead of placing the
|
|
moov atom at the end. If the space reserved is insufficient, muxing will fail.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_tmcd</samp></dt>
|
|
<dd><p>Specify <code class="code">on</code> to force writing a timecode track, <code class="code">off</code> to disable it
|
|
and <code class="code">auto</code> to write a timecode track only for mov and mp4 output (default).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_btrt <var class="var">bool</var></samp></dt>
|
|
<dd><p>Force or disable writing bitrate box inside stsd box of a track.
|
|
The box contains decoding buffer size (in bytes), maximum bitrate and
|
|
average bitrate for the track. The box will be skipped if none of these values
|
|
can be computed.
|
|
Default is <code class="code">-1</code> or <code class="code">auto</code>, which will write the box only in MP4 mode.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_prft</samp></dt>
|
|
<dd><p>Write producer time reference box (PRFT) with a specified time source for the
|
|
NTP field in the PRFT box. Set value as ‘<samp class="samp">wallclock</samp>’ to specify timesource
|
|
as wallclock time and ‘<samp class="samp">pts</samp>’ to specify timesource as input packets’ PTS
|
|
values.
|
|
</p>
|
|
<p>Setting value to ‘<samp class="samp">pts</samp>’ is applicable only for a live encoding use case,
|
|
where PTS values are set as as wallclock time at the source. For example, an
|
|
encoding use case with decklink capture source where <samp class="option">video_pts</samp> and
|
|
<samp class="option">audio_pts</samp> are set to ‘<samp class="samp">abs_wallclock</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">empty_hdlr_name <var class="var">bool</var></samp></dt>
|
|
<dd><p>Enable to skip writing the name inside a <code class="code">hdlr</code> box.
|
|
Default is <code class="code">false</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">movie_timescale <var class="var">scale</var></samp></dt>
|
|
<dd><p>Set the timescale written in the movie header box (<code class="code">mvhd</code>).
|
|
Range is 1 to INT_MAX. Default is 1000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">video_track_timescale <var class="var">scale</var></samp></dt>
|
|
<dd><p>Set the timescale used for video tracks. Range is 0 to INT_MAX.
|
|
If set to <code class="code">0</code>, the timescale is automatically set based on
|
|
the native stream time base. Default is 0.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Example">
|
|
<h4 class="subsection">4.22.2 Example</h4>
|
|
|
|
<p>Smooth Streaming content can be pushed in real time to a publishing
|
|
point on IIS with this muxer. Example:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re <var class="var"><normal input/transcoding options></var> -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)
|
|
</pre></div>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="mp3">
|
|
<h3 class="section">4.23 mp3</h3>
|
|
|
|
<p>The MP3 muxer writes a raw MP3 stream with the following optional features:
|
|
</p><ul class="itemize mark-bullet">
|
|
<li>An ID3v2 metadata header at the beginning (enabled by default). Versions 2.3 and
|
|
2.4 are supported, the <code class="code">id3v2_version</code> private option controls which one is
|
|
used (3 or 4). Setting <code class="code">id3v2_version</code> to 0 disables the ID3v2 header
|
|
completely.
|
|
|
|
<p>The muxer supports writing attached pictures (APIC frames) to the ID3v2 header.
|
|
The pictures are supplied to the muxer in form of a video stream with a single
|
|
packet. There can be any number of those streams, each will correspond to a
|
|
single APIC frame. The stream metadata tags <var class="var">title</var> and <var class="var">comment</var> map
|
|
to APIC <var class="var">description</var> and <var class="var">picture type</var> respectively. See
|
|
<a class="url" href="http://id3.org/id3v2.4.0-frames">http://id3.org/id3v2.4.0-frames</a> for allowed picture types.
|
|
</p>
|
|
<p>Note that the APIC frames must be written at the beginning, so the muxer will
|
|
buffer the audio frames until it gets all the pictures. It is therefore advised
|
|
to provide the pictures as soon as possible to avoid excessive buffering.
|
|
</p>
|
|
</li><li>A Xing/LAME frame right after the ID3v2 header (if present). It is enabled by
|
|
default, but will be written only if the output is seekable. The
|
|
<code class="code">write_xing</code> private option can be used to disable it. The frame contains
|
|
various information that may be useful to the decoder, like the audio duration
|
|
or encoder delay.
|
|
|
|
</li><li>A legacy ID3v1 tag at the end of the file (disabled by default). It may be
|
|
enabled with the <code class="code">write_id3v1</code> private option, but as its capabilities are
|
|
very limited, its usage is not recommended.
|
|
</li></ul>
|
|
|
|
<p>Examples:
|
|
</p>
|
|
<p>Write an mp3 with an ID3v2.3 header and an ID3v1 footer:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -id3v2_version 3 -write_id3v1 1 out.mp3
|
|
</pre></div>
|
|
|
|
<p>To attach a picture to an mp3 file select both the audio and the picture stream
|
|
with <code class="code">map</code>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1
|
|
-metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3
|
|
</pre></div>
|
|
|
|
<p>Write a "clean" MP3 without any extra features:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
|
|
</pre></div>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="mpegts-1">
|
|
<h3 class="section">4.24 mpegts</h3>
|
|
|
|
<p>MPEG transport stream muxer.
|
|
</p>
|
|
<p>This muxer implements ISO 13818-1 and part of ETSI EN 300 468.
|
|
</p>
|
|
<p>The recognized metadata settings in mpegts muxer are <code class="code">service_provider</code>
|
|
and <code class="code">service_name</code>. If they are not set the default for
|
|
<code class="code">service_provider</code> is ‘<samp class="samp">FFmpeg</samp>’ and the default for
|
|
<code class="code">service_name</code> is ‘<samp class="samp">Service01</samp>’.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-14" accesskey="1">Options</a></li>
|
|
<li><a href="#Example-1" accesskey="2">Example</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-14">
|
|
<h4 class="subsection">4.24.1 Options</h4>
|
|
|
|
<p>The muxer options are:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">mpegts_transport_stream_id <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set the ‘<samp class="samp">transport_stream_id</samp>’. This identifies a transponder in DVB.
|
|
Default is <code class="code">0x0001</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpegts_original_network_id <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set the ‘<samp class="samp">original_network_id</samp>’. This is unique identifier of a
|
|
network in DVB. Its main use is in the unique identification of a service
|
|
through the path ‘<samp class="samp">Original_Network_ID, Transport_Stream_ID</samp>’. Default
|
|
is <code class="code">0x0001</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpegts_service_id <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set the ‘<samp class="samp">service_id</samp>’, also known as program in DVB. Default is
|
|
<code class="code">0x0001</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpegts_service_type <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set the program ‘<samp class="samp">service_type</samp>’. Default is <code class="code">digital_tv</code>.
|
|
Accepts the following options:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">hex_value</samp>’</dt>
|
|
<dd><p>Any hexadecimal value between <code class="code">0x01</code> and <code class="code">0xff</code> as defined in
|
|
ETSI 300 468.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">digital_tv</samp>’</dt>
|
|
<dd><p>Digital TV service.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">digital_radio</samp>’</dt>
|
|
<dd><p>Digital Radio service.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">teletext</samp>’</dt>
|
|
<dd><p>Teletext service.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">advanced_codec_digital_radio</samp>’</dt>
|
|
<dd><p>Advanced Codec Digital Radio service.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">mpeg2_digital_hdtv</samp>’</dt>
|
|
<dd><p>MPEG2 Digital HDTV service.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">advanced_codec_digital_sdtv</samp>’</dt>
|
|
<dd><p>Advanced Codec Digital SDTV service.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">advanced_codec_digital_hdtv</samp>’</dt>
|
|
<dd><p>Advanced Codec Digital HDTV service.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">mpegts_pmt_start_pid <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set the first PID for PMTs. Default is <code class="code">0x1000</code>, minimum is <code class="code">0x0020</code>,
|
|
maximum is <code class="code">0x1ffa</code>. This option has no effect in m2ts mode where the PMT
|
|
PID is fixed <code class="code">0x0100</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpegts_start_pid <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set the first PID for elementary streams. Default is <code class="code">0x0100</code>, minimum is
|
|
<code class="code">0x0020</code>, maximum is <code class="code">0x1ffa</code>. This option has no effect in m2ts mode
|
|
where the elementary stream PIDs are fixed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpegts_m2ts_mode <var class="var">boolean</var></samp></dt>
|
|
<dd><p>Enable m2ts mode if set to <code class="code">1</code>. Default value is <code class="code">-1</code> which
|
|
disables m2ts mode.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">muxrate <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set a constant muxrate. Default is VBR.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">pes_payload_size <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set minimum PES packet payload in bytes. Default is <code class="code">2930</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">mpegts_flags <var class="var">flags</var></samp></dt>
|
|
<dd><p>Set mpegts flags. Accepts the following options:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">resend_headers</samp>’</dt>
|
|
<dd><p>Reemit PAT/PMT before writing the next packet.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">latm</samp>’</dt>
|
|
<dd><p>Use LATM packetization for AAC.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">pat_pmt_at_frames</samp>’</dt>
|
|
<dd><p>Reemit PAT and PMT at each video frame.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">system_b</samp>’</dt>
|
|
<dd><p>Conform to System B (DVB) instead of System A (ATSC).
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">initial_discontinuity</samp>’</dt>
|
|
<dd><p>Mark the initial packet of each stream as discontinuity.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">nit</samp>’</dt>
|
|
<dd><p>Emit NIT table.
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">omit_rai</samp>’</dt>
|
|
<dd><p>Disable writing of random access indicator.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">mpegts_copyts <var class="var">boolean</var></samp></dt>
|
|
<dd><p>Preserve original timestamps, if value is set to <code class="code">1</code>. Default value
|
|
is <code class="code">-1</code>, which results in shifting timestamps so that they start from 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">omit_video_pes_length <var class="var">boolean</var></samp></dt>
|
|
<dd><p>Omit the PES packet length for video packets. Default is <code class="code">1</code> (true).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">pcr_period <var class="var">integer</var></samp></dt>
|
|
<dd><p>Override the default PCR retransmission time in milliseconds. Default is
|
|
<code class="code">-1</code> which means that the PCR interval will be determined automatically:
|
|
20 ms is used for CBR streams, the highest multiple of the frame duration which
|
|
is less than 100 ms is used for VBR streams.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">pat_period <var class="var">duration</var></samp></dt>
|
|
<dd><p>Maximum time in seconds between PAT/PMT tables. Default is <code class="code">0.1</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">sdt_period <var class="var">duration</var></samp></dt>
|
|
<dd><p>Maximum time in seconds between SDT tables. Default is <code class="code">0.5</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">nit_period <var class="var">duration</var></samp></dt>
|
|
<dd><p>Maximum time in seconds between NIT tables. Default is <code class="code">0.5</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">tables_version <var class="var">integer</var></samp></dt>
|
|
<dd><p>Set PAT, PMT, SDT and NIT version (default <code class="code">0</code>, valid values are from 0 to 31, inclusively).
|
|
This option allows updating stream structure so that standard consumer may
|
|
detect the change. To do so, reopen output <code class="code">AVFormatContext</code> (in case of API
|
|
usage) or restart <code class="command">ffmpeg</code> instance, cyclically changing
|
|
<samp class="option">tables_version</samp> value:
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
|
|
ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
|
|
...
|
|
ffmpeg -i source3.ts -codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
|
|
ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
|
|
ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
|
|
...
|
|
</pre></div>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Example-1">
|
|
<h4 class="subsection">4.24.2 Example</h4>
|
|
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i file.mpg -c copy \
|
|
-mpegts_original_network_id 0x1122 \
|
|
-mpegts_transport_stream_id 0x3344 \
|
|
-mpegts_service_id 0x5566 \
|
|
-mpegts_pmt_start_pid 0x1500 \
|
|
-mpegts_start_pid 0x150 \
|
|
-metadata service_provider="Some provider" \
|
|
-metadata service_name="Some Channel" \
|
|
out.ts
|
|
</pre></div>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="mxf_002c-mxf_005fd10_002c-mxf_005fopatom">
|
|
<h3 class="section">4.25 mxf, mxf_d10, mxf_opatom</h3>
|
|
|
|
<p>MXF muxer.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-15" accesskey="1">Options</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-15">
|
|
<h4 class="subsection">4.25.1 Options</h4>
|
|
|
|
<p>The muxer options are:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">store_user_comments <var class="var">bool</var></samp></dt>
|
|
<dd><p>Set if user comments should be stored if available or never.
|
|
IRT D-10 does not allow user comments. The default is thus to write them for
|
|
mxf and mxf_opatom but not for mxf_d10
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="null">
|
|
<h3 class="section">4.26 null</h3>
|
|
|
|
<p>Null muxer.
|
|
</p>
|
|
<p>This muxer does not generate any output file, it is mainly useful for
|
|
testing or benchmarking purposes.
|
|
</p>
|
|
<p>For example to benchmark decoding with <code class="command">ffmpeg</code> you can use the
|
|
command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -benchmark -i INPUT -f null out.null
|
|
</pre></div>
|
|
|
|
<p>Note that the above command does not read or write the <samp class="file">out.null</samp>
|
|
file, but specifying the output file is required by the <code class="command">ffmpeg</code>
|
|
syntax.
|
|
</p>
|
|
<p>Alternatively you can write the command as:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -benchmark -i INPUT -f null -
|
|
</pre></div>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="nut">
|
|
<h3 class="section">4.27 nut</h3>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">-syncpoints <var class="var">flags</var></samp></dt>
|
|
<dd><p>Change the syncpoint usage in nut:
|
|
</p><dl class="table">
|
|
<dt><samp class="option"><var class="var">default</var> use the normal low-overhead seeking aids.</samp></dt>
|
|
<dt><samp class="option"><var class="var">none</var> do not use the syncpoints at all, reducing the overhead but making the stream non-seekable;</samp></dt>
|
|
<dd><p>Use of this option is not recommended, as the resulting files are very damage
|
|
sensitive and seeking is not possible. Also in general the overhead from
|
|
syncpoints is negligible. Note, -<code class="code">write_index</code> 0 can be used to disable
|
|
all growing data tables, allowing to mux endless streams with limited memory
|
|
and without these disadvantages.
|
|
</p></dd>
|
|
<dt><samp class="option"><var class="var">timestamped</var> extend the syncpoint with a wallclock field.</samp></dt>
|
|
</dl>
|
|
<p>The <var class="var">none</var> and <var class="var">timestamped</var> flags are experimental.
|
|
</p></dd>
|
|
<dt><samp class="option">-write_index <var class="var">bool</var></samp></dt>
|
|
<dd><p>Write index at the end, the default is to write an index.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor
|
|
</pre></div>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="ogg">
|
|
<h3 class="section">4.28 ogg</h3>
|
|
|
|
<p>Ogg container muxer.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">-page_duration <var class="var">duration</var></samp></dt>
|
|
<dd><p>Preferred page duration, in microseconds. The muxer will attempt to create
|
|
pages that are approximately <var class="var">duration</var> microseconds long. This allows the
|
|
user to compromise between seek granularity and container overhead. The default
|
|
is 1 second. A value of 0 will fill all segments, making pages as large as
|
|
possible. A value of 1 will effectively use 1 packet-per-page in most
|
|
situations, giving a small seek granularity at the cost of additional container
|
|
overhead.
|
|
</p></dd>
|
|
<dt><samp class="option">-serial_offset <var class="var">value</var></samp></dt>
|
|
<dd><p>Serial value from which to set the streams serial number.
|
|
Setting it to different and sufficiently large values ensures that the produced
|
|
ogg files can be safely chained.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="raw-muxers"></a></div>
|
|
<div class="section-level-extent" id="raw-muxers-1">
|
|
<h3 class="section">4.29 raw muxers</h3>
|
|
|
|
<p>Raw muxers accept a single stream matching the designated codec. They do not store timestamps or metadata.
|
|
The recognized extension is the same as the muxer name unless indicated otherwise.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#ac3" accesskey="1">ac3</a></li>
|
|
<li><a href="#adx" accesskey="2">adx</a></li>
|
|
<li><a href="#aptx" accesskey="3">aptx</a></li>
|
|
<li><a href="#aptx_005fhd" accesskey="4">aptx_hd</a></li>
|
|
<li><a href="#avs2" accesskey="5">avs2</a></li>
|
|
<li><a href="#cavsvideo" accesskey="6">cavsvideo</a></li>
|
|
<li><a href="#codec2raw" accesskey="7">codec2raw</a></li>
|
|
<li><a href="#data" accesskey="8">data</a></li>
|
|
<li><a href="#dirac" accesskey="9">dirac</a></li>
|
|
<li><a href="#dnxhd">dnxhd</a></li>
|
|
<li><a href="#dts">dts</a></li>
|
|
<li><a href="#eac3">eac3</a></li>
|
|
<li><a href="#g722">g722</a></li>
|
|
<li><a href="#g723_005f1">g723_1</a></li>
|
|
<li><a href="#g726">g726</a></li>
|
|
<li><a href="#g726le">g726le</a></li>
|
|
<li><a href="#gsm">gsm</a></li>
|
|
<li><a href="#h261">h261</a></li>
|
|
<li><a href="#h263">h263</a></li>
|
|
<li><a href="#h264">h264</a></li>
|
|
<li><a href="#hevc">hevc</a></li>
|
|
<li><a href="#m4v">m4v</a></li>
|
|
<li><a href="#mjpeg">mjpeg</a></li>
|
|
<li><a href="#mlp">mlp</a></li>
|
|
<li><a href="#mp2">mp2</a></li>
|
|
<li><a href="#mpeg1video">mpeg1video</a></li>
|
|
<li><a href="#mpeg2video">mpeg2video</a></li>
|
|
<li><a href="#obu">obu</a></li>
|
|
<li><a href="#rawvideo-1">rawvideo</a></li>
|
|
<li><a href="#sbc">sbc</a></li>
|
|
<li><a href="#truehd">truehd</a></li>
|
|
<li><a href="#vc1">vc1</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="ac3">
|
|
<h4 class="subsection">4.29.1 ac3</h4>
|
|
|
|
<p>Dolby Digital, also known as AC-3, audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="adx">
|
|
<h4 class="subsection">4.29.2 adx</h4>
|
|
|
|
<p>CRI Middleware ADX audio.
|
|
</p>
|
|
<p>This muxer will write out the total sample count near the start of the first packet
|
|
when the output is seekable and the count can be stored in 32 bits.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="aptx">
|
|
<h4 class="subsection">4.29.3 aptx</h4>
|
|
|
|
<p>aptX (Audio Processing Technology for Bluetooth) audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="aptx_005fhd">
|
|
<h4 class="subsection">4.29.4 aptx_hd</h4>
|
|
|
|
<p>aptX HD (Audio Processing Technology for Bluetooth) audio.
|
|
</p>
|
|
<p>Extensions: aptxhd
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="avs2">
|
|
<h4 class="subsection">4.29.5 avs2</h4>
|
|
|
|
<p>AVS2-P2/IEEE1857.4 video.
|
|
</p>
|
|
<p>Extensions: avs, avs2
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="cavsvideo">
|
|
<h4 class="subsection">4.29.6 cavsvideo</h4>
|
|
|
|
<p>Chinese AVS (Audio Video Standard) video.
|
|
</p>
|
|
<p>Extensions: cavs
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="codec2raw">
|
|
<h4 class="subsection">4.29.7 codec2raw</h4>
|
|
|
|
<p>Codec 2 audio.
|
|
</p>
|
|
<p>No extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool <code class="code">-f codec2raw</code>.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="data">
|
|
<h4 class="subsection">4.29.8 data</h4>
|
|
|
|
<p>Data muxer accepts a single stream with any codec of any type.
|
|
The input stream has to be selected using the <code class="code">-map</code> option with the ffmpeg CLI tool.
|
|
</p>
|
|
<p>No extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool <code class="code">-f data</code>.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="dirac">
|
|
<h4 class="subsection">4.29.9 dirac</h4>
|
|
|
|
<p>BBC Dirac video. The Dirac Pro codec is a subset and is standardized as SMPTE VC-2.
|
|
</p>
|
|
<p>Extensions: drc, vc2
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="dnxhd">
|
|
<h4 class="subsection">4.29.10 dnxhd</h4>
|
|
|
|
<p>Avid DNxHD video. It is standardized as SMPTE VC-3. Accepts DNxHR streams.
|
|
</p>
|
|
<p>Extensions: dnxhd, dnxhr
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="dts">
|
|
<h4 class="subsection">4.29.11 dts</h4>
|
|
|
|
<p>DTS Coherent Acoustics (DCA) audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="eac3">
|
|
<h4 class="subsection">4.29.12 eac3</h4>
|
|
|
|
<p>Dolby Digital Plus, also known as Enhanced AC-3, audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="g722">
|
|
<h4 class="subsection">4.29.13 g722</h4>
|
|
|
|
<p>ITU-T G.722 audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="g723_005f1">
|
|
<h4 class="subsection">4.29.14 g723_1</h4>
|
|
|
|
<p>ITU-T G.723.1 audio.
|
|
</p>
|
|
<p>Extensions: tco, rco
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="g726">
|
|
<h4 class="subsection">4.29.15 g726</h4>
|
|
|
|
<p>ITU-T G.726 big-endian ("left-justified") audio.
|
|
</p>
|
|
<p>No extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool <code class="code">-f g726</code>.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="g726le">
|
|
<h4 class="subsection">4.29.16 g726le</h4>
|
|
|
|
<p>ITU-T G.726 little-endian ("right-justified") audio.
|
|
</p>
|
|
<p>No extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool <code class="code">-f g726le</code>.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="gsm">
|
|
<h4 class="subsection">4.29.17 gsm</h4>
|
|
|
|
<p>Global System for Mobile Communications audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="h261">
|
|
<h4 class="subsection">4.29.18 h261</h4>
|
|
|
|
<p>ITU-T H.261 video.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="h263">
|
|
<h4 class="subsection">4.29.19 h263</h4>
|
|
|
|
<p>ITU-T H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2 video.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="h264">
|
|
<h4 class="subsection">4.29.20 h264</h4>
|
|
|
|
<p>ITU-T H.264 / MPEG-4 Part 10 AVC video. Bitstream shall be converted to Annex B syntax if it’s in length-prefixed mode.
|
|
</p>
|
|
<p>Extensions: h264, 264
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="hevc">
|
|
<h4 class="subsection">4.29.21 hevc</h4>
|
|
|
|
<p>ITU-T H.265 / MPEG-H Part 2 HEVC video. Bitstream shall be converted to Annex B syntax if it’s in length-prefixed mode.
|
|
</p>
|
|
<p>Extensions: hevc, h265, 265
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="m4v">
|
|
<h4 class="subsection">4.29.22 m4v</h4>
|
|
|
|
<p>MPEG-4 Part 2 video.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="mjpeg">
|
|
<h4 class="subsection">4.29.23 mjpeg</h4>
|
|
|
|
<p>Motion JPEG video.
|
|
</p>
|
|
<p>Extensions: mjpg, mjpeg
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="mlp">
|
|
<h4 class="subsection">4.29.24 mlp</h4>
|
|
|
|
<p>Meridian Lossless Packing, also known as Packed PCM, audio.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="mp2">
|
|
<h4 class="subsection">4.29.25 mp2</h4>
|
|
|
|
<p>MPEG-1 Audio Layer II audio.
|
|
</p>
|
|
<p>Extensions: mp2, m2a, mpa
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="mpeg1video">
|
|
<h4 class="subsection">4.29.26 mpeg1video</h4>
|
|
|
|
<p>MPEG-1 Part 2 video.
|
|
</p>
|
|
<p>Extensions: mpg, mpeg, m1v
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="mpeg2video">
|
|
<h4 class="subsection">4.29.27 mpeg2video</h4>
|
|
|
|
<p>ITU-T H.262 / MPEG-2 Part 2 video.
|
|
</p>
|
|
<p>Extensions: m2v
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="obu">
|
|
<h4 class="subsection">4.29.28 obu</h4>
|
|
|
|
<p>AV1 low overhead Open Bitstream Units muxer. Temporal delimiter OBUs will be inserted in all temporal units of the stream.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="rawvideo-1">
|
|
<h4 class="subsection">4.29.29 rawvideo</h4>
|
|
|
|
<p>Raw uncompressed video.
|
|
</p>
|
|
<p>Extensions: yuv, rgb
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="sbc">
|
|
<h4 class="subsection">4.29.30 sbc</h4>
|
|
|
|
<p>Bluetooth SIG low-complexity subband codec audio.
|
|
</p>
|
|
<p>Extensions: sbc, msbc
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="truehd">
|
|
<h4 class="subsection">4.29.31 truehd</h4>
|
|
|
|
<p>Dolby TrueHD audio.
|
|
</p>
|
|
<p>Extensions: thd
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="vc1">
|
|
<h4 class="subsection">4.29.32 vc1</h4>
|
|
|
|
<p>SMPTE 421M / VC-1 video.
|
|
</p>
|
|
<a class="anchor" id="segment"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="segment_002c-stream_005fsegment_002c-ssegment">
|
|
<h3 class="section">4.30 segment, stream_segment, ssegment</h3>
|
|
|
|
<p>Basic stream segmenter.
|
|
</p>
|
|
<p>This muxer outputs streams to a number of separate files of nearly
|
|
fixed duration. Output filename pattern can be set in a fashion
|
|
similar to <a class="ref" href="#image2">image2</a>, or by using a <code class="code">strftime</code> template if
|
|
the <samp class="option">strftime</samp> option is enabled.
|
|
</p>
|
|
<p><code class="code">stream_segment</code> is a variant of the muxer used to write to
|
|
streaming output formats, i.e. which do not require global headers,
|
|
and is recommended for outputting e.g. to MPEG transport stream segments.
|
|
<code class="code">ssegment</code> is a shorter alias for <code class="code">stream_segment</code>.
|
|
</p>
|
|
<p>Every segment starts with a keyframe of the selected reference stream,
|
|
which is set through the <samp class="option">reference_stream</samp> option.
|
|
</p>
|
|
<p>Note that if you want accurate splitting for a video file, you need to
|
|
make the input key frames correspond to the exact splitting times
|
|
expected by the segmenter, or the segment muxer will start the new
|
|
segment with the key frame found next after the specified start
|
|
time.
|
|
</p>
|
|
<p>The segment muxer works best with a single constant frame rate video.
|
|
</p>
|
|
<p>Optionally it can generate a list of the created segments, by setting
|
|
the option <var class="var">segment_list</var>. The list type is specified by the
|
|
<var class="var">segment_list_type</var> option. The entry filenames in the segment
|
|
list are set by default to the basename of the corresponding segment
|
|
files.
|
|
</p>
|
|
<p>See also the <a class="ref" href="#hls">hls</a> muxer, which provides a more specific
|
|
implementation for HLS segmentation.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-16" accesskey="1">Options</a></li>
|
|
<li><a href="#Examples-10" accesskey="2">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-16">
|
|
<h4 class="subsection">4.30.1 Options</h4>
|
|
|
|
<p>The segment muxer supports the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">increment_tc <var class="var">1|0</var></samp></dt>
|
|
<dd><p>if set to <code class="code">1</code>, increment timecode between each segment
|
|
If this is selected, the input need to have
|
|
a timecode in the first video stream. Default value is
|
|
<code class="code">0</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">reference_stream <var class="var">specifier</var></samp></dt>
|
|
<dd><p>Set the reference stream, as specified by the string <var class="var">specifier</var>.
|
|
If <var class="var">specifier</var> is set to <code class="code">auto</code>, the reference is chosen
|
|
automatically. Otherwise it must be a stream specifier (see the “Stream
|
|
specifiers” chapter in the ffmpeg manual) which specifies the
|
|
reference stream. The default value is <code class="code">auto</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_format <var class="var">format</var></samp></dt>
|
|
<dd><p>Override the inner container format, by default it is guessed by the filename
|
|
extension.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_format_options <var class="var">options_list</var></samp></dt>
|
|
<dd><p>Set output format options using a :-separated list of key=value
|
|
parameters. Values containing the <code class="code">:</code> special character must be
|
|
escaped.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_list <var class="var">name</var></samp></dt>
|
|
<dd><p>Generate also a listfile named <var class="var">name</var>. If not specified no
|
|
listfile is generated.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_list_flags <var class="var">flags</var></samp></dt>
|
|
<dd><p>Set flags affecting the segment list generation.
|
|
</p>
|
|
<p>It currently supports the following flags:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">cache</samp>’</dt>
|
|
<dd><p>Allow caching (only affects M3U8 list files).
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">live</samp>’</dt>
|
|
<dd><p>Allow live-friendly file generation.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">segment_list_size <var class="var">size</var></samp></dt>
|
|
<dd><p>Update the list file so that it contains at most <var class="var">size</var>
|
|
segments. If 0 the list file will contain all the segments. Default
|
|
value is 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_list_entry_prefix <var class="var">prefix</var></samp></dt>
|
|
<dd><p>Prepend <var class="var">prefix</var> to each entry. Useful to generate absolute paths.
|
|
By default no prefix is applied.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_list_type <var class="var">type</var></samp></dt>
|
|
<dd><p>Select the listing format.
|
|
</p>
|
|
<p>The following values are recognized:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">flat</samp>’</dt>
|
|
<dd><p>Generate a flat list for the created segments, one segment per line.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">csv, ext</samp>’</dt>
|
|
<dd><p>Generate a list for the created segments, one segment per line,
|
|
each line matching the format (comma-separated values):
|
|
</p><div class="example">
|
|
<pre class="example-preformatted"><var class="var">segment_filename</var>,<var class="var">segment_start_time</var>,<var class="var">segment_end_time</var>
|
|
</pre></div>
|
|
|
|
<p><var class="var">segment_filename</var> is the name of the output file generated by the
|
|
muxer according to the provided pattern. CSV escaping (according to
|
|
RFC4180) is applied if required.
|
|
</p>
|
|
<p><var class="var">segment_start_time</var> and <var class="var">segment_end_time</var> specify
|
|
the segment start and end time expressed in seconds.
|
|
</p>
|
|
<p>A list file with the suffix <code class="code">".csv"</code> or <code class="code">".ext"</code> will
|
|
auto-select this format.
|
|
</p>
|
|
<p>‘<samp class="samp">ext</samp>’ is deprecated in favor or ‘<samp class="samp">csv</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">ffconcat</samp>’</dt>
|
|
<dd><p>Generate an ffconcat file for the created segments. The resulting file
|
|
can be read using the FFmpeg <a class="ref" href="#concat">concat</a> demuxer.
|
|
</p>
|
|
<p>A list file with the suffix <code class="code">".ffcat"</code> or <code class="code">".ffconcat"</code> will
|
|
auto-select this format.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp class="samp">m3u8</samp>’</dt>
|
|
<dd><p>Generate an extended M3U8 file, version 3, compliant with
|
|
<a class="url" href="http://tools.ietf.org/id/draft-pantos-http-live-streaming">http://tools.ietf.org/id/draft-pantos-http-live-streaming</a>.
|
|
</p>
|
|
<p>A list file with the suffix <code class="code">".m3u8"</code> will auto-select this format.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>If not specified the type is guessed from the list file name suffix.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_time <var class="var">time</var></samp></dt>
|
|
<dd><p>Set segment duration to <var class="var">time</var>, the value must be a duration
|
|
specification. Default value is "2". See also the
|
|
<samp class="option">segment_times</samp> option.
|
|
</p>
|
|
<p>Note that splitting may not be accurate, unless you force the
|
|
reference stream key-frames at the given time. See the introductory
|
|
notice and the examples below.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">min_seg_duration <var class="var">time</var></samp></dt>
|
|
<dd><p>Set minimum segment duration to <var class="var">time</var>, the value must be a duration
|
|
specification. This prevents the muxer ending segments at a duration below
|
|
this value. Only effective with <code class="code">segment_time</code>. Default value is "0".
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_atclocktime <var class="var">1|0</var></samp></dt>
|
|
<dd><p>If set to "1" split at regular clock time intervals starting from 00:00
|
|
o’clock. The <var class="var">time</var> value specified in <samp class="option">segment_time</samp> is
|
|
used for setting the length of the splitting interval.
|
|
</p>
|
|
<p>For example with <samp class="option">segment_time</samp> set to "900" this makes it possible
|
|
to create files at 12:00 o’clock, 12:15, 12:30, etc.
|
|
</p>
|
|
<p>Default value is "0".
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_clocktime_offset <var class="var">duration</var></samp></dt>
|
|
<dd><p>Delay the segment splitting times with the specified duration when using
|
|
<samp class="option">segment_atclocktime</samp>.
|
|
</p>
|
|
<p>For example with <samp class="option">segment_time</samp> set to "900" and
|
|
<samp class="option">segment_clocktime_offset</samp> set to "300" this makes it possible to
|
|
create files at 12:05, 12:20, 12:35, etc.
|
|
</p>
|
|
<p>Default value is "0".
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_clocktime_wrap_duration <var class="var">duration</var></samp></dt>
|
|
<dd><p>Force the segmenter to only start a new segment if a packet reaches the muxer
|
|
within the specified duration after the segmenting clock time. This way you
|
|
can make the segmenter more resilient to backward local time jumps, such as
|
|
leap seconds or transition to standard time from daylight savings time.
|
|
</p>
|
|
<p>Default is the maximum possible duration which means starting a new segment
|
|
regardless of the elapsed time since the last clock time.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_time_delta <var class="var">delta</var></samp></dt>
|
|
<dd><p>Specify the accuracy time when selecting the start time for a
|
|
segment, expressed as a duration specification. Default value is "0".
|
|
</p>
|
|
<p>When delta is specified a key-frame will start a new segment if its
|
|
PTS satisfies the relation:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">PTS >= start_time - time_delta
|
|
</pre></div>
|
|
|
|
<p>This option is useful when splitting video content, which is always
|
|
split at GOP boundaries, in case a key frame is found just before the
|
|
specified split time.
|
|
</p>
|
|
<p>In particular may be used in combination with the <samp class="file">ffmpeg</samp> option
|
|
<var class="var">force_key_frames</var>. The key frame times specified by
|
|
<var class="var">force_key_frames</var> may not be set accurately because of rounding
|
|
issues, with the consequence that a key frame time may result set just
|
|
before the specified time. For constant frame rate videos a value of
|
|
1/(2*<var class="var">frame_rate</var>) should address the worst case mismatch between
|
|
the specified time and the time set by <var class="var">force_key_frames</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_times <var class="var">times</var></samp></dt>
|
|
<dd><p>Specify a list of split points. <var class="var">times</var> contains a list of comma
|
|
separated duration specifications, in increasing order. See also
|
|
the <samp class="option">segment_time</samp> option.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_frames <var class="var">frames</var></samp></dt>
|
|
<dd><p>Specify a list of split video frame numbers. <var class="var">frames</var> contains a
|
|
list of comma separated integer numbers, in increasing order.
|
|
</p>
|
|
<p>This option specifies to start a new segment whenever a reference
|
|
stream key frame is found and the sequential number (starting from 0)
|
|
of the frame is greater or equal to the next value in the list.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_wrap <var class="var">limit</var></samp></dt>
|
|
<dd><p>Wrap around segment index once it reaches <var class="var">limit</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">segment_start_number <var class="var">number</var></samp></dt>
|
|
<dd><p>Set the sequence number of the first segment. Defaults to <code class="code">0</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">strftime <var class="var">1|0</var></samp></dt>
|
|
<dd><p>Use the <code class="code">strftime</code> function to define the name of the new
|
|
segments to write. If this is selected, the output segment name must
|
|
contain a <code class="code">strftime</code> function template. Default value is
|
|
<code class="code">0</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">break_non_keyframes <var class="var">1|0</var></samp></dt>
|
|
<dd><p>If enabled, allow segments to start on frames other than keyframes. This
|
|
improves behavior on some players when the time between keyframes is
|
|
inconsistent, but may make things worse on others, and can cause some oddities
|
|
during seeking. Defaults to <code class="code">0</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">reset_timestamps <var class="var">1|0</var></samp></dt>
|
|
<dd><p>Reset timestamps at the beginning of each segment, so that each segment
|
|
will start with near-zero timestamps. It is meant to ease the playback
|
|
of the generated segments. May not work with some combinations of
|
|
muxers/codecs. It is set to <code class="code">0</code> by default.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">initial_offset <var class="var">offset</var></samp></dt>
|
|
<dd><p>Specify timestamp offset to apply to the output packet timestamps. The
|
|
argument must be a time duration specification, and defaults to 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">write_empty_segments <var class="var">1|0</var></samp></dt>
|
|
<dd><p>If enabled, write an empty segment if there are no packets during the period a
|
|
segment would usually span. Otherwise, the segment will be filled with the next
|
|
packet written. Defaults to <code class="code">0</code>.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>Make sure to require a closed GOP when encoding and to set the GOP
|
|
size to fit your segment time constraint.
|
|
</p>
|
|
</div>
|
|
<div class="subsection-level-extent" id="Examples-10">
|
|
<h4 class="subsection">4.30.2 Examples</h4>
|
|
|
|
<ul class="itemize mark-bullet">
|
|
<li>Remux the content of file <samp class="file">in.mkv</samp> to a list of segments
|
|
<samp class="file">out-000.nut</samp>, <samp class="file">out-001.nut</samp>, etc., and write the list of
|
|
generated segments to <samp class="file">out.list</samp>:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -codec hevc -flags +cgop -g 60 -map 0 -f segment -segment_list out.list out%03d.nut
|
|
</pre></div>
|
|
|
|
</li><li>Segment input and set output format options for the output segments:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -f segment -segment_time 10 -segment_format_options movflags=+faststart out%03d.mp4
|
|
</pre></div>
|
|
|
|
</li><li>Segment the input file according to the split points specified by the
|
|
<var class="var">segment_times</var> option:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 out%03d.nut
|
|
</pre></div>
|
|
|
|
</li><li>Use the <code class="command">ffmpeg</code> <samp class="option">force_key_frames</samp>
|
|
option to force key frames in the input at the specified location, together
|
|
with the segment option <samp class="option">segment_time_delta</samp> to account for
|
|
possible roundings operated when setting key frame times.
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le -map 0 \
|
|
-f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut
|
|
</pre></div>
|
|
<p>In order to force key frames on the input file, transcoding is
|
|
required.
|
|
</p>
|
|
</li><li>Segment the input file by splitting the input file according to the
|
|
frame numbers sequence specified with the <samp class="option">segment_frames</samp> option:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut
|
|
</pre></div>
|
|
|
|
</li><li>Convert the <samp class="file">in.mkv</samp> to TS segments using the <code class="code">libx264</code>
|
|
and <code class="code">aac</code> encoders:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts
|
|
</pre></div>
|
|
|
|
</li><li>Segment the input file, and create an M3U8 live playlist (can be used
|
|
as live HLS source):
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segment_list playlist.m3u8 \
|
|
-segment_list_flags +live -segment_time 10 out%03d.mkv
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="smoothstreaming">
|
|
<h3 class="section">4.31 smoothstreaming</h3>
|
|
|
|
<p>Smooth Streaming muxer generates a set of files (Manifest, chunks) suitable for serving with conventional web server.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">window_size</samp></dt>
|
|
<dd><p>Specify the number of fragments kept in the manifest. Default 0 (keep all).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">extra_window_size</samp></dt>
|
|
<dd><p>Specify the number of fragments kept outside of the manifest before removing from disk. Default 5.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">lookahead_count</samp></dt>
|
|
<dd><p>Specify the number of lookahead fragments. Default 2.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">min_frag_duration</samp></dt>
|
|
<dd><p>Specify the minimum fragment duration (in microseconds). Default 5000000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">remove_at_exit</samp></dt>
|
|
<dd><p>Specify whether to remove all fragments when finished. Default 0 (do not remove).
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a class="anchor" id="streamhash"></a></div>
|
|
<div class="section-level-extent" id="streamhash-1">
|
|
<h3 class="section">4.32 streamhash</h3>
|
|
|
|
<p>Per stream hash testing format.
|
|
</p>
|
|
<p>This muxer computes and prints a cryptographic hash of all the input frames,
|
|
on a per-stream basis. This can be used for equality checks without having
|
|
to do a complete binary comparison.
|
|
</p>
|
|
<p>By default audio frames are converted to signed 16-bit raw audio and
|
|
video frames to raw video before computing the hash, but the output
|
|
of explicit conversions to other codecs can also be used. Timestamps
|
|
are ignored. It uses the SHA-256 cryptographic hash function by default,
|
|
but supports several other algorithms.
|
|
</p>
|
|
<p>The output of the muxer consists of one line per stream of the form:
|
|
<var class="var">streamindex</var>,<var class="var">streamtype</var>,<var class="var">algo</var>=<var class="var">hash</var>, where
|
|
<var class="var">streamindex</var> is the index of the mapped stream, <var class="var">streamtype</var> is a
|
|
single character indicating the type of stream, <var class="var">algo</var> is a short string
|
|
representing the hash function used, and <var class="var">hash</var> is a hexadecimal number
|
|
representing the computed hash.
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">hash <var class="var">algorithm</var></samp></dt>
|
|
<dd><p>Use the cryptographic hash function specified by the string <var class="var">algorithm</var>.
|
|
Supported values include <code class="code">MD5</code>, <code class="code">murmur3</code>, <code class="code">RIPEMD128</code>,
|
|
<code class="code">RIPEMD160</code>, <code class="code">RIPEMD256</code>, <code class="code">RIPEMD320</code>, <code class="code">SHA160</code>,
|
|
<code class="code">SHA224</code>, <code class="code">SHA256</code> (default), <code class="code">SHA512/224</code>, <code class="code">SHA512/256</code>,
|
|
<code class="code">SHA384</code>, <code class="code">SHA512</code>, <code class="code">CRC32</code> and <code class="code">adler32</code>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="#Examples-11" accesskey="1">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Examples-11">
|
|
<h4 class="subsection">4.32.1 Examples</h4>
|
|
|
|
<p>To compute the SHA-256 hash of the input converted to raw audio and
|
|
video, and store it in the file <samp class="file">out.sha256</samp>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f streamhash out.sha256
|
|
</pre></div>
|
|
|
|
<p>To print an MD5 hash to stdout use the command:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f streamhash -hash md5 -
|
|
</pre></div>
|
|
|
|
<p>See also the <a class="ref" href="#hash">hash</a> and <a class="ref" href="#framehash">framehash</a> muxers.
|
|
</p>
|
|
<a class="anchor" id="tee"></a></div>
|
|
</div>
|
|
<div class="section-level-extent" id="tee-1">
|
|
<h3 class="section">4.33 tee</h3>
|
|
|
|
<p>The tee muxer can be used to write the same data to several outputs, such as files or streams.
|
|
It can be used, for example, to stream a video over a network and save it to disk at the same time.
|
|
</p>
|
|
<p>It is different from specifying several outputs to the <code class="command">ffmpeg</code>
|
|
command-line tool. With the tee muxer, the audio and video data will be encoded only once.
|
|
With conventional multiple outputs, multiple encoding operations in parallel are initiated,
|
|
which can be a very expensive process. The tee muxer is not useful when using the libavformat API
|
|
directly because it is then possible to feed the same packets to several muxers directly.
|
|
</p>
|
|
<p>Since the tee muxer does not represent any particular output format, ffmpeg cannot auto-select
|
|
output streams. So all streams intended for output must be specified using <code class="code">-map</code>. See
|
|
the examples below.
|
|
</p>
|
|
<p>Some encoders may need different options depending on the output format;
|
|
the auto-detection of this can not work with the tee muxer, so they need to be explicitly specified.
|
|
The main example is the <samp class="option">global_header</samp> flag.
|
|
</p>
|
|
<p>The slave outputs are specified in the file name given to the muxer,
|
|
separated by ’|’. If any of the slave name contains the ’|’ separator,
|
|
leading or trailing spaces or any special character, those must be
|
|
escaped (see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#quoting_005fand_005fescaping">(ffmpeg-utils)the "Quoting and escaping"
|
|
section in the ffmpeg-utils(1) manual</a>).
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-17" accesskey="1">Options</a></li>
|
|
<li><a href="#Examples-12" accesskey="2">Examples</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-17">
|
|
<h4 class="subsection">4.33.1 Options</h4>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">use_fifo <var class="var">bool</var></samp></dt>
|
|
<dd><p>If set to 1, slave outputs will be processed in separate threads using the <a class="ref" href="#fifo">fifo</a>
|
|
muxer. This allows to compensate for different speed/latency/reliability of
|
|
outputs and setup transparent recovery. By default this feature is turned off.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">fifo_options</samp></dt>
|
|
<dd><p>Options to pass to fifo pseudo-muxer instances. See <a class="ref" href="#fifo">fifo</a>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>Muxer options can be specified for each slave by prepending them as a list of
|
|
<var class="var">key</var>=<var class="var">value</var> pairs separated by ’:’, between square brackets. If
|
|
the options values contain a special character or the ’:’ separator, they
|
|
must be escaped; note that this is a second level escaping.
|
|
</p>
|
|
<p>The following special options are also recognized:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">f</samp></dt>
|
|
<dd><p>Specify the format name. Required if it cannot be guessed from the
|
|
output URL.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">bsfs[/<var class="var">spec</var>]</samp></dt>
|
|
<dd><p>Specify a list of bitstream filters to apply to the specified
|
|
output.
|
|
</p>
|
|
<p>It is possible to specify to which streams a given bitstream filter
|
|
applies, by appending a stream specifier to the option separated by
|
|
<code class="code">/</code>. <var class="var">spec</var> must be a stream specifier (see <a class="ref" href="#Format-stream-specifiers">Format stream specifiers</a>).
|
|
</p>
|
|
<p>If the stream specifier is not specified, the bitstream filters will be
|
|
applied to all streams in the output. This will cause that output operation
|
|
to fail if the output contains streams to which the bitstream filter cannot
|
|
be applied e.g. <code class="code">h264_mp4toannexb</code> being applied to an output containing an audio stream.
|
|
</p>
|
|
<p>Options for a bitstream filter must be specified in the form of <code class="code">opt=value</code>.
|
|
</p>
|
|
<p>Several bitstream filters can be specified, separated by ",".
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">use_fifo <var class="var">bool</var></samp></dt>
|
|
<dd><p>This allows to override tee muxer use_fifo option for individual slave muxer.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">fifo_options</samp></dt>
|
|
<dd><p>This allows to override tee muxer fifo_options for individual slave muxer.
|
|
See <a class="ref" href="#fifo">fifo</a>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">select</samp></dt>
|
|
<dd><p>Select the streams that should be mapped to the slave output,
|
|
specified by a stream specifier. If not specified, this defaults to
|
|
all the mapped streams. This will cause that output operation to fail
|
|
if the output format does not accept all mapped streams.
|
|
</p>
|
|
<p>You may use multiple stream specifiers separated by commas (<code class="code">,</code>) e.g.: <code class="code">a:0,v</code>
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">onfail</samp></dt>
|
|
<dd><p>Specify behaviour on output failure. This can be set to either <code class="code">abort</code> (which is
|
|
default) or <code class="code">ignore</code>. <code class="code">abort</code> will cause whole process to fail in case of failure
|
|
on this slave output. <code class="code">ignore</code> will ignore failure on this output, so other outputs
|
|
will continue without being affected.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Examples-12">
|
|
<h4 class="subsection">4.33.2 Examples</h4>
|
|
|
|
<ul class="itemize mark-bullet">
|
|
<li>Encode something and both archive it in a WebM file and stream it
|
|
as MPEG-TS over UDP:
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
|
|
"archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
|
|
</pre></div>
|
|
|
|
</li><li>As above, but continue streaming even if output to local file fails
|
|
(for example local drive fills up):
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
|
|
"[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
|
|
</pre></div>
|
|
|
|
</li><li>Use <code class="command">ffmpeg</code> to encode the input, and send the output
|
|
to three different destinations. The <code class="code">dump_extra</code> bitstream
|
|
filter is used to add extradata information to all the output video
|
|
keyframes packets, as requested by the MPEG-TS format. The select
|
|
option is applied to <samp class="file">out.aac</samp> in order to make it contain only
|
|
audio packets.
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
|
|
-f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"
|
|
</pre></div>
|
|
|
|
</li><li>As above, but select only stream <code class="code">a:1</code> for the audio output. Note
|
|
that a second level escaping must be performed, as ":" is a special
|
|
character used to separate options.
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
|
|
-f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="webm_005fchunk">
|
|
<h3 class="section">4.34 webm_chunk</h3>
|
|
|
|
<p>WebM Live Chunk Muxer.
|
|
</p>
|
|
<p>This muxer writes out WebM headers and chunks as separate files which can be
|
|
consumed by clients that support WebM Live streams via DASH.
|
|
</p>
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-18" accesskey="1">Options</a></li>
|
|
<li><a href="#Example-2" accesskey="2">Example</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-18">
|
|
<h4 class="subsection">4.34.1 Options</h4>
|
|
|
|
<p>This muxer supports the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">chunk_start_index</samp></dt>
|
|
<dd><p>Index of the first chunk (defaults to 0).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">header</samp></dt>
|
|
<dd><p>Filename of the header where the initialization data will be written.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">audio_chunk_duration</samp></dt>
|
|
<dd><p>Duration of each audio chunk in milliseconds (defaults to 5000).
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Example-2">
|
|
<h4 class="subsection">4.34.2 Example</h4>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -f v4l2 -i /dev/video0 \
|
|
-f alsa -i hw:0 \
|
|
-map 0:0 \
|
|
-c:v libvpx-vp9 \
|
|
-s 640x360 -keyint_min 30 -g 30 \
|
|
-f webm_chunk \
|
|
-header webm_live_video_360.hdr \
|
|
-chunk_start_index 1 \
|
|
webm_live_video_360_%d.chk \
|
|
-map 1:0 \
|
|
-c:a libvorbis \
|
|
-b:a 128k \
|
|
-f webm_chunk \
|
|
-header webm_live_audio_128.hdr \
|
|
-chunk_start_index 1 \
|
|
-audio_chunk_duration 1000 \
|
|
webm_live_audio_128_%d.chk
|
|
</pre></div>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="section-level-extent" id="webm_005fdash_005fmanifest">
|
|
<h3 class="section">4.35 webm_dash_manifest</h3>
|
|
|
|
<p>WebM DASH Manifest muxer.
|
|
</p>
|
|
<p>This muxer implements the WebM DASH Manifest specification to generate the DASH
|
|
manifest XML. It also supports manifest generation for DASH live streams.
|
|
</p>
|
|
<p>For more information see:
|
|
</p>
|
|
<ul class="itemize mark-bullet">
|
|
<li>WebM DASH Specification: <a class="url" href="https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification">https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification</a>
|
|
</li><li>ISO DASH Specification: <a class="url" href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip</a>
|
|
</li></ul>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="#Options-19" accesskey="1">Options</a></li>
|
|
<li><a href="#Example-3" accesskey="2">Example</a></li>
|
|
</ul>
|
|
<div class="subsection-level-extent" id="Options-19">
|
|
<h4 class="subsection">4.35.1 Options</h4>
|
|
|
|
<p>This muxer supports the following options:
|
|
</p>
|
|
<dl class="table">
|
|
<dt><samp class="option">adaptation_sets</samp></dt>
|
|
<dd><p>This option has the following syntax: "id=x,streams=a,b,c id=y,streams=d,e" where x and y are the
|
|
unique identifiers of the adaptation sets and a,b,c,d and e are the indices of the corresponding
|
|
audio and video streams. Any number of adaptation sets can be added using this option.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">live</samp></dt>
|
|
<dd><p>Set this to 1 to create a live stream DASH Manifest. Default: 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">chunk_start_index</samp></dt>
|
|
<dd><p>Start index of the first chunk. This will go in the ‘<samp class="samp">startNumber</samp>’ attribute
|
|
of the ‘<samp class="samp">SegmentTemplate</samp>’ element in the manifest. Default: 0.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">chunk_duration_ms</samp></dt>
|
|
<dd><p>Duration of each chunk in milliseconds. This will go in the ‘<samp class="samp">duration</samp>’
|
|
attribute of the ‘<samp class="samp">SegmentTemplate</samp>’ element in the manifest. Default: 1000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">utc_timing_url</samp></dt>
|
|
<dd><p>URL of the page that will return the UTC timestamp in ISO format. This will go
|
|
in the ‘<samp class="samp">value</samp>’ attribute of the ‘<samp class="samp">UTCTiming</samp>’ element in the manifest.
|
|
Default: None.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">time_shift_buffer_depth</samp></dt>
|
|
<dd><p>Smallest time (in seconds) shifting buffer for which any Representation is
|
|
guaranteed to be available. This will go in the ‘<samp class="samp">timeShiftBufferDepth</samp>’
|
|
attribute of the ‘<samp class="samp">MPD</samp>’ element. Default: 60.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">minimum_update_period</samp></dt>
|
|
<dd><p>Minimum update period (in seconds) of the manifest. This will go in the
|
|
‘<samp class="samp">minimumUpdatePeriod</samp>’ attribute of the ‘<samp class="samp">MPD</samp>’ element. Default: 0.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="subsection-level-extent" id="Example-3">
|
|
<h4 class="subsection">4.35.2 Example</h4>
|
|
<div class="example">
|
|
<pre class="example-preformatted">ffmpeg -f webm_dash_manifest -i video1.webm \
|
|
-f webm_dash_manifest -i video2.webm \
|
|
-f webm_dash_manifest -i audio1.webm \
|
|
-f webm_dash_manifest -i audio2.webm \
|
|
-map 0 -map 1 -map 2 -map 3 \
|
|
-c copy \
|
|
-f webm_dash_manifest \
|
|
-adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
|
|
manifest.xml
|
|
</pre></div>
|
|
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="chapter-level-extent" id="Metadata-1">
|
|
<h2 class="chapter">5 Metadata</h2>
|
|
|
|
<p>FFmpeg is able to dump metadata from media files into a simple UTF-8-encoded
|
|
INI-like text file and then load it back using the metadata muxer/demuxer.
|
|
</p>
|
|
<p>The file format is as follows:
|
|
</p><ol class="enumerate">
|
|
<li> A file consists of a header and a number of metadata tags divided into sections,
|
|
each on its own line.
|
|
|
|
</li><li> The header is a ‘<samp class="samp">;FFMETADATA</samp>’ string, followed by a version number (now 1).
|
|
|
|
</li><li> Metadata tags are of the form ‘<samp class="samp">key=value</samp>’
|
|
|
|
</li><li> Immediately after header follows global metadata
|
|
|
|
</li><li> After global metadata there may be sections with per-stream/per-chapter
|
|
metadata.
|
|
|
|
</li><li> A section starts with the section name in uppercase (i.e. STREAM or CHAPTER) in
|
|
brackets (‘<samp class="samp">[</samp>’, ‘<samp class="samp">]</samp>’) and ends with next section or end of file.
|
|
|
|
</li><li> At the beginning of a chapter section there may be an optional timebase to be
|
|
used for start/end values. It must be in form
|
|
‘<samp class="samp">TIMEBASE=<var class="var">num</var>/<var class="var">den</var></samp>’, where <var class="var">num</var> and <var class="var">den</var> are
|
|
integers. If the timebase is missing then start/end times are assumed to
|
|
be in nanoseconds.
|
|
|
|
<p>Next a chapter section must contain chapter start and end times in form
|
|
‘<samp class="samp">START=<var class="var">num</var></samp>’, ‘<samp class="samp">END=<var class="var">num</var></samp>’, where <var class="var">num</var> is a positive
|
|
integer.
|
|
</p>
|
|
</li><li> Empty lines and lines starting with ‘<samp class="samp">;</samp>’ or ‘<samp class="samp">#</samp>’ are ignored.
|
|
|
|
</li><li> Metadata keys or values containing special characters (‘<samp class="samp">=</samp>’, ‘<samp class="samp">;</samp>’,
|
|
‘<samp class="samp">#</samp>’, ‘<samp class="samp">\</samp>’ and a newline) must be escaped with a backslash ‘<samp class="samp">\</samp>’.
|
|
|
|
</li><li> Note that whitespace in metadata (e.g. ‘<samp class="samp">foo = bar</samp>’) is considered to be
|
|
a part of the tag (in the example above key is ‘<samp class="samp">foo </samp>’, value is
|
|
‘<samp class="samp"> bar</samp>’).
|
|
</li></ol>
|
|
|
|
<p>A ffmetadata file might look like this:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">;FFMETADATA1
|
|
title=bike\\shed
|
|
;this is a comment
|
|
artist=FFmpeg troll team
|
|
|
|
[CHAPTER]
|
|
TIMEBASE=1/1000
|
|
START=0
|
|
#chapter ends at 0:01:00
|
|
END=60000
|
|
title=chapter \#1
|
|
[STREAM]
|
|
title=multi\
|
|
line
|
|
</pre></div>
|
|
|
|
<p>By using the ffmetadata muxer and demuxer it is possible to extract
|
|
metadata from an input file to an ffmetadata file, and then transcode
|
|
the file into an output file with the edited ffmetadata file.
|
|
</p>
|
|
<p>Extracting an ffmetadata file with <samp class="file">ffmpeg</samp> goes as follows:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE
|
|
</pre></div>
|
|
|
|
<p>Reinserting edited metadata information from the FFMETADATAFILE file can
|
|
be done as:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec copy OUTPUT
|
|
</pre></div>
|
|
|
|
|
|
</div>
|
|
<div class="chapter-level-extent" id="See-Also">
|
|
<h2 class="chapter">6 See Also</h2>
|
|
|
|
<p><a class="url" href="ffmpeg.html">ffmpeg</a>, <a class="url" href="ffplay.html">ffplay</a>, <a class="url" href="ffprobe.html">ffprobe</a>,
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<a class="url" href="libavformat.html">libavformat</a>
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</p>
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</div>
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<div class="chapter-level-extent" id="Authors">
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<h2 class="chapter">7 Authors</h2>
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<p>The FFmpeg developers.
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</p>
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<p>For details about the authorship, see the Git history of the project
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(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
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<code class="command">git log</code> in the FFmpeg source directory, or browsing the
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online repository at <a class="url" href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</a>.
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</p>
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<p>Maintainers for the specific components are listed in the file
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<samp class="file">MAINTAINERS</samp> in the source code tree.
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</p>
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</div>
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</div>
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</body>
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</html>
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