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
894 lines
37 KiB
HTML
894 lines
37 KiB
HTML
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>ffplay Documentation</title>
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<meta name="description" content="ffplay Documentation">
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<meta name="keywords" content="ffplay Documentation">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link href="#SEC_Contents" rel="contents" title="Table of Contents">
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<style type="text/css">
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</head>
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<body lang="en">
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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-Synopsis" href="#Synopsis">1 Synopsis</a></li>
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<li><a id="toc-Description" href="#Description">2 Description</a></li>
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<li><a id="toc-Options" href="#Options">3 Options</a>
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<ul class="toc-numbered-mark">
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<li><a id="toc-Stream-specifiers-1" href="#Stream-specifiers-1">3.1 Stream specifiers</a></li>
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<li><a id="toc-Generic-options" href="#Generic-options">3.2 Generic options</a></li>
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<li><a id="toc-AVOptions" href="#AVOptions">3.3 AVOptions</a></li>
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<li><a id="toc-Main-options" href="#Main-options">3.4 Main options</a></li>
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<li><a id="toc-Advanced-options" href="#Advanced-options">3.5 Advanced options</a></li>
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<li><a id="toc-While-playing" href="#While-playing">3.6 While playing</a></li>
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</ul></li>
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<li><a id="toc-See-Also" href="#See-Also">4 See Also</a></li>
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<li><a id="toc-Authors" href="#Authors">5 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="Synopsis">
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<h2 class="chapter">1 Synopsis</h2>
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<p>ffplay [<var class="var">options</var>] [<samp class="file">input_url</samp>]
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</p>
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</div>
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<div class="chapter-level-extent" id="Description">
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<h2 class="chapter">2 Description</h2>
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<p>FFplay is a very simple and portable media player using the FFmpeg
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libraries and the SDL library. It is mostly used as a testbed for the
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various FFmpeg APIs.
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</p>
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</div>
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<div class="chapter-level-extent" id="Options">
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<h2 class="chapter">3 Options</h2>
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<p>All the numerical options, if not specified otherwise, accept a string
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representing a number as input, which may be followed by one of the SI
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unit prefixes, for example: ’K’, ’M’, or ’G’.
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</p>
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<p>If ’i’ is appended to the SI unit prefix, the complete prefix will be
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interpreted as a unit prefix for binary multiples, which are based on
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powers of 1024 instead of powers of 1000. Appending ’B’ to the SI unit
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prefix multiplies the value by 8. This allows using, for example:
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’KB’, ’MiB’, ’G’ and ’B’ as number suffixes.
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</p>
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<p>Options which do not take arguments are boolean options, and set the
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corresponding value to true. They can be set to false by prefixing
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the option name with "no". For example using "-nofoo"
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will set the boolean option with name "foo" to false.
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</p>
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<a class="anchor" id="Stream-specifiers"></a><ul class="mini-toc">
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<li><a href="#Stream-specifiers-1" accesskey="1">Stream specifiers</a></li>
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<li><a href="#Generic-options" accesskey="2">Generic options</a></li>
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<li><a href="#AVOptions" accesskey="3">AVOptions</a></li>
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<li><a href="#Main-options" accesskey="4">Main options</a></li>
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<li><a href="#Advanced-options" accesskey="5">Advanced options</a></li>
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<li><a href="#While-playing" accesskey="6">While playing</a></li>
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</ul>
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<div class="section-level-extent" id="Stream-specifiers-1">
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<h3 class="section">3.1 Stream specifiers</h3>
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<p>Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers
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are used to precisely specify which stream(s) a given option belongs to.
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</p>
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<p>A stream specifier is a string generally appended to the option name and
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separated from it by a colon. E.g. <code class="code">-codec:a:1 ac3</code> contains the
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<code class="code">a:1</code> stream specifier, which matches the second audio stream. Therefore, it
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would select the ac3 codec for the second audio stream.
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</p>
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<p>A stream specifier can match several streams, so that the option is applied to all
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of them. E.g. the stream specifier in <code class="code">-b:a 128k</code> matches all audio
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streams.
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</p>
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<p>An empty stream specifier matches all streams. For example, <code class="code">-codec copy</code>
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or <code class="code">-codec: copy</code> would copy all the streams without reencoding.
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</p>
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<p>Possible forms of stream specifiers are:
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</p><dl class="table">
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<dt><samp class="option"><var class="var">stream_index</var></samp></dt>
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<dd><p>Matches the stream with this index. E.g. <code class="code">-threads:1 4</code> would set the
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thread count for the second stream to 4. If <var class="var">stream_index</var> is used as an
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additional stream specifier (see below), then it selects stream number
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<var class="var">stream_index</var> from the matching streams. Stream numbering is based on the
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order of the streams as detected by libavformat except when a program ID is
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also specified. In this case it is based on the ordering of the streams in the
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program.
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</p></dd>
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<dt><samp class="option"><var class="var">stream_type</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
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<dd><p><var class="var">stream_type</var> is one of following: ’v’ or ’V’ for video, ’a’ for audio, ’s’
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for subtitle, ’d’ for data, and ’t’ for attachments. ’v’ matches all video
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streams, ’V’ only matches video streams which are not attached pictures, video
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thumbnails or cover arts. If <var class="var">additional_stream_specifier</var> is used, then
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it matches streams which both have this type and match the
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<var class="var">additional_stream_specifier</var>. Otherwise, it matches all streams of the
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specified type.
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</p></dd>
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<dt><samp class="option">p:<var class="var">program_id</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
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<dd><p>Matches streams which are in the program with the id <var class="var">program_id</var>. If
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<var class="var">additional_stream_specifier</var> is used, then it matches streams which both
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are part of the program and match the <var class="var">additional_stream_specifier</var>.
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</p>
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</dd>
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<dt><samp class="option">#<var class="var">stream_id</var> or i:<var class="var">stream_id</var></samp></dt>
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<dd><p>Match the stream by stream id (e.g. PID in MPEG-TS container).
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</p></dd>
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<dt><samp class="option">m:<var class="var">key</var>[:<var class="var">value</var>]</samp></dt>
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<dd><p>Matches streams with the metadata tag <var class="var">key</var> having the specified value. If
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<var class="var">value</var> is not given, matches streams that contain the given tag with any
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value.
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</p></dd>
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<dt><samp class="option">u</samp></dt>
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<dd><p>Matches streams with usable configuration, the codec must be defined and the
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essential information such as video dimension or audio sample rate must be present.
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</p>
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<p>Note that in <code class="command">ffmpeg</code>, matching by metadata will only work properly for
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input files.
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</p></dd>
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</dl>
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</div>
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<div class="section-level-extent" id="Generic-options">
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<h3 class="section">3.2 Generic options</h3>
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<p>These options are shared amongst the ff* tools.
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</p>
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<dl class="table">
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<dt><samp class="option">-L</samp></dt>
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<dd><p>Show license.
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</p>
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</dd>
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<dt><samp class="option">-h, -?, -help, --help [<var class="var">arg</var>]</samp></dt>
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<dd><p>Show help. An optional parameter may be specified to print help about a specific
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item. If no argument is specified, only basic (non advanced) tool
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options are shown.
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</p>
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<p>Possible values of <var class="var">arg</var> are:
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</p><dl class="table">
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<dt><samp class="option">long</samp></dt>
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<dd><p>Print advanced tool options in addition to the basic tool options.
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</p>
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</dd>
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<dt><samp class="option">full</samp></dt>
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<dd><p>Print complete list of options, including shared and private options
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for encoders, decoders, demuxers, muxers, filters, etc.
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</p>
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</dd>
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<dt><samp class="option">decoder=<var class="var">decoder_name</var></samp></dt>
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<dd><p>Print detailed information about the decoder named <var class="var">decoder_name</var>. Use the
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<samp class="option">-decoders</samp> option to get a list of all decoders.
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</p>
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</dd>
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<dt><samp class="option">encoder=<var class="var">encoder_name</var></samp></dt>
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<dd><p>Print detailed information about the encoder named <var class="var">encoder_name</var>. Use the
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<samp class="option">-encoders</samp> option to get a list of all encoders.
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</p>
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</dd>
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<dt><samp class="option">demuxer=<var class="var">demuxer_name</var></samp></dt>
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<dd><p>Print detailed information about the demuxer named <var class="var">demuxer_name</var>. Use the
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<samp class="option">-formats</samp> option to get a list of all demuxers and muxers.
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</p>
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</dd>
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<dt><samp class="option">muxer=<var class="var">muxer_name</var></samp></dt>
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<dd><p>Print detailed information about the muxer named <var class="var">muxer_name</var>. Use the
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<samp class="option">-formats</samp> option to get a list of all muxers and demuxers.
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</p>
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</dd>
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<dt><samp class="option">filter=<var class="var">filter_name</var></samp></dt>
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<dd><p>Print detailed information about the filter named <var class="var">filter_name</var>. Use the
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<samp class="option">-filters</samp> option to get a list of all filters.
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</p>
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</dd>
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<dt><samp class="option">bsf=<var class="var">bitstream_filter_name</var></samp></dt>
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<dd><p>Print detailed information about the bitstream filter named <var class="var">bitstream_filter_name</var>.
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Use the <samp class="option">-bsfs</samp> option to get a list of all bitstream filters.
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</p>
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</dd>
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<dt><samp class="option">protocol=<var class="var">protocol_name</var></samp></dt>
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<dd><p>Print detailed information about the protocol named <var class="var">protocol_name</var>.
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Use the <samp class="option">-protocols</samp> option to get a list of all protocols.
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</p></dd>
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</dl>
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</dd>
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<dt><samp class="option">-version</samp></dt>
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<dd><p>Show version.
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</p>
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</dd>
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<dt><samp class="option">-buildconf</samp></dt>
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<dd><p>Show the build configuration, one option per line.
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</p>
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</dd>
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<dt><samp class="option">-formats</samp></dt>
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<dd><p>Show available formats (including devices).
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</p>
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</dd>
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<dt><samp class="option">-demuxers</samp></dt>
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<dd><p>Show available demuxers.
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</p>
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</dd>
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<dt><samp class="option">-muxers</samp></dt>
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<dd><p>Show available muxers.
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</p>
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</dd>
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<dt><samp class="option">-devices</samp></dt>
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<dd><p>Show available devices.
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</p>
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</dd>
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<dt><samp class="option">-codecs</samp></dt>
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<dd><p>Show all codecs known to libavcodec.
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</p>
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<p>Note that the term ’codec’ is used throughout this documentation as a shortcut
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for what is more correctly called a media bitstream format.
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</p>
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</dd>
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<dt><samp class="option">-decoders</samp></dt>
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<dd><p>Show available decoders.
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</p>
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</dd>
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<dt><samp class="option">-encoders</samp></dt>
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<dd><p>Show all available encoders.
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</p>
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</dd>
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<dt><samp class="option">-bsfs</samp></dt>
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<dd><p>Show available bitstream filters.
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</p>
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</dd>
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<dt><samp class="option">-protocols</samp></dt>
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<dd><p>Show available protocols.
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</p>
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</dd>
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<dt><samp class="option">-filters</samp></dt>
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<dd><p>Show available libavfilter filters.
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</p>
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</dd>
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<dt><samp class="option">-pix_fmts</samp></dt>
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<dd><p>Show available pixel formats.
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</p>
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</dd>
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<dt><samp class="option">-sample_fmts</samp></dt>
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<dd><p>Show available sample formats.
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</p>
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</dd>
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<dt><samp class="option">-layouts</samp></dt>
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<dd><p>Show channel names and standard channel layouts.
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</p>
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</dd>
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<dt><samp class="option">-dispositions</samp></dt>
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<dd><p>Show stream dispositions.
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</p>
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</dd>
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<dt><samp class="option">-colors</samp></dt>
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<dd><p>Show recognized color names.
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</p>
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</dd>
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<dt><samp class="option">-sources <var class="var">device</var>[,<var class="var">opt1</var>=<var class="var">val1</var>[,<var class="var">opt2</var>=<var class="var">val2</var>]...]</samp></dt>
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<dd><p>Show autodetected sources of the input device.
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Some devices may provide system-dependent source names that cannot be autodetected.
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The returned list cannot be assumed to be always complete.
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</p><div class="example">
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<pre class="example-preformatted">ffmpeg -sources pulse,server=192.168.0.4
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</pre></div>
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</dd>
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<dt><samp class="option">-sinks <var class="var">device</var>[,<var class="var">opt1</var>=<var class="var">val1</var>[,<var class="var">opt2</var>=<var class="var">val2</var>]...]</samp></dt>
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<dd><p>Show autodetected sinks of the output device.
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Some devices may provide system-dependent sink names that cannot be autodetected.
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The returned list cannot be assumed to be always complete.
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</p><div class="example">
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<pre class="example-preformatted">ffmpeg -sinks pulse,server=192.168.0.4
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</pre></div>
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</dd>
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<dt><samp class="option">-loglevel [<var class="var">flags</var>+]<var class="var">loglevel</var> | -v [<var class="var">flags</var>+]<var class="var">loglevel</var></samp></dt>
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<dd><p>Set logging level and flags used by the library.
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</p>
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<p>The optional <var class="var">flags</var> prefix can consist of the following values:
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</p><dl class="table">
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<dt>‘<samp class="samp">repeat</samp>’</dt>
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<dd><p>Indicates that repeated log output should not be compressed to the first line
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and the "Last message repeated n times" line will be omitted.
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</p></dd>
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<dt>‘<samp class="samp">level</samp>’</dt>
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<dd><p>Indicates that log output should add a <code class="code">[level]</code> prefix to each message
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line. This can be used as an alternative to log coloring, e.g. when dumping the
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log to file.
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</p></dd>
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</dl>
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<p>Flags can also be used alone by adding a ’+’/’-’ prefix to set/reset a single
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flag without affecting other <var class="var">flags</var> or changing <var class="var">loglevel</var>. When
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setting both <var class="var">flags</var> and <var class="var">loglevel</var>, a ’+’ separator is expected
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between the last <var class="var">flags</var> value and before <var class="var">loglevel</var>.
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</p>
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<p><var class="var">loglevel</var> is a string or a number containing one of the following values:
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</p><dl class="table">
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<dt>‘<samp class="samp">quiet, -8</samp>’</dt>
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<dd><p>Show nothing at all; be silent.
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</p></dd>
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<dt>‘<samp class="samp">panic, 0</samp>’</dt>
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<dd><p>Only show fatal errors which could lead the process to crash, such as
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an assertion failure. This is not currently used for anything.
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</p></dd>
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<dt>‘<samp class="samp">fatal, 8</samp>’</dt>
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<dd><p>Only show fatal errors. These are errors after which the process absolutely
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cannot continue.
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</p></dd>
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<dt>‘<samp class="samp">error, 16</samp>’</dt>
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<dd><p>Show all errors, including ones which can be recovered from.
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</p></dd>
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<dt>‘<samp class="samp">warning, 24</samp>’</dt>
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<dd><p>Show all warnings and errors. Any message related to possibly
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incorrect or unexpected events will be shown.
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</p></dd>
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<dt>‘<samp class="samp">info, 32</samp>’</dt>
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<dd><p>Show informative messages during processing. This is in addition to
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warnings and errors. This is the default value.
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</p></dd>
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<dt>‘<samp class="samp">verbose, 40</samp>’</dt>
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<dd><p>Same as <code class="code">info</code>, except more verbose.
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</p></dd>
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<dt>‘<samp class="samp">debug, 48</samp>’</dt>
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<dd><p>Show everything, including debugging information.
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</p></dd>
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<dt>‘<samp class="samp">trace, 56</samp>’</dt>
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</dl>
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<p>For example to enable repeated log output, add the <code class="code">level</code> prefix, and set
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<var class="var">loglevel</var> to <code class="code">verbose</code>:
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</p><div class="example">
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<pre class="example-preformatted">ffmpeg -loglevel repeat+level+verbose -i input output
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|
</pre></div>
|
|
<p>Another example that enables repeated log output without affecting current
|
|
state of <code class="code">level</code> prefix flag or <var class="var">loglevel</var>:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg [...] -loglevel +repeat
|
|
</pre></div>
|
|
|
|
<p>By default the program logs to stderr. If coloring is supported by the
|
|
terminal, colors are used to mark errors and warnings. Log coloring
|
|
can be disabled setting the environment variable
|
|
<code class="env">AV_LOG_FORCE_NOCOLOR</code>, or can be forced setting
|
|
the environment variable <code class="env">AV_LOG_FORCE_COLOR</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-report</samp></dt>
|
|
<dd><p>Dump full command line and log output to a file named
|
|
<code class="code"><var class="var">program</var>-<var class="var">YYYYMMDD</var>-<var class="var">HHMMSS</var>.log</code> in the current
|
|
directory.
|
|
This file can be useful for bug reports.
|
|
It also implies <code class="code">-loglevel debug</code>.
|
|
</p>
|
|
<p>Setting the environment variable <code class="env">FFREPORT</code> to any value has the
|
|
same effect. If the value is a ’:’-separated key=value sequence, these
|
|
options will affect the report; option values must be escaped if they
|
|
contain special characters or the options delimiter ’:’ (see the
|
|
“Quoting and escaping” section in the ffmpeg-utils manual).
|
|
</p>
|
|
<p>The following options are recognized:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">file</samp></dt>
|
|
<dd><p>set the file name to use for the report; <code class="code">%p</code> is expanded to the name
|
|
of the program, <code class="code">%t</code> is expanded to a timestamp, <code class="code">%%</code> is expanded
|
|
to a plain <code class="code">%</code>
|
|
</p></dd>
|
|
<dt><samp class="option">level</samp></dt>
|
|
<dd><p>set the log verbosity level using a numerical value (see <code class="code">-loglevel</code>).
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>For example, to output a report to a file named <samp class="file">ffreport.log</samp>
|
|
using a log level of <code class="code">32</code> (alias for log level <code class="code">info</code>):
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example-preformatted">FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
|
|
</pre></div>
|
|
|
|
<p>Errors in parsing the environment variable are not fatal, and will not
|
|
appear in the report.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-hide_banner</samp></dt>
|
|
<dd><p>Suppress printing banner.
|
|
</p>
|
|
<p>All FFmpeg tools will normally show a copyright notice, build options
|
|
and library versions. This option can be used to suppress printing
|
|
this information.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-cpuflags flags (<em class="emph">global</em>)</samp></dt>
|
|
<dd><p>Allows setting and clearing cpu flags. This option is intended
|
|
for testing. Do not use it unless you know what you’re doing.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -cpuflags -sse+mmx ...
|
|
ffmpeg -cpuflags mmx ...
|
|
ffmpeg -cpuflags 0 ...
|
|
</pre></div>
|
|
<p>Possible flags for this option are:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">x86</samp>’</dt>
|
|
<dd><dl class="table">
|
|
<dt>‘<samp class="samp">mmx</samp>’</dt>
|
|
<dt>‘<samp class="samp">mmxext</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse2</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse2slow</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse3</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse3slow</samp>’</dt>
|
|
<dt>‘<samp class="samp">ssse3</samp>’</dt>
|
|
<dt>‘<samp class="samp">atom</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse4.1</samp>’</dt>
|
|
<dt>‘<samp class="samp">sse4.2</samp>’</dt>
|
|
<dt>‘<samp class="samp">avx</samp>’</dt>
|
|
<dt>‘<samp class="samp">avx2</samp>’</dt>
|
|
<dt>‘<samp class="samp">xop</samp>’</dt>
|
|
<dt>‘<samp class="samp">fma3</samp>’</dt>
|
|
<dt>‘<samp class="samp">fma4</samp>’</dt>
|
|
<dt>‘<samp class="samp">3dnow</samp>’</dt>
|
|
<dt>‘<samp class="samp">3dnowext</samp>’</dt>
|
|
<dt>‘<samp class="samp">bmi1</samp>’</dt>
|
|
<dt>‘<samp class="samp">bmi2</samp>’</dt>
|
|
<dt>‘<samp class="samp">cmov</samp>’</dt>
|
|
</dl>
|
|
</dd>
|
|
<dt>‘<samp class="samp">ARM</samp>’</dt>
|
|
<dd><dl class="table">
|
|
<dt>‘<samp class="samp">armv5te</samp>’</dt>
|
|
<dt>‘<samp class="samp">armv6</samp>’</dt>
|
|
<dt>‘<samp class="samp">armv6t2</samp>’</dt>
|
|
<dt>‘<samp class="samp">vfp</samp>’</dt>
|
|
<dt>‘<samp class="samp">vfpv3</samp>’</dt>
|
|
<dt>‘<samp class="samp">neon</samp>’</dt>
|
|
<dt>‘<samp class="samp">setend</samp>’</dt>
|
|
</dl>
|
|
</dd>
|
|
<dt>‘<samp class="samp">AArch64</samp>’</dt>
|
|
<dd><dl class="table">
|
|
<dt>‘<samp class="samp">armv8</samp>’</dt>
|
|
<dt>‘<samp class="samp">vfp</samp>’</dt>
|
|
<dt>‘<samp class="samp">neon</samp>’</dt>
|
|
</dl>
|
|
</dd>
|
|
<dt>‘<samp class="samp">PowerPC</samp>’</dt>
|
|
<dd><dl class="table">
|
|
<dt>‘<samp class="samp">altivec</samp>’</dt>
|
|
</dl>
|
|
</dd>
|
|
<dt>‘<samp class="samp">Specific Processors</samp>’</dt>
|
|
<dd><dl class="table">
|
|
<dt>‘<samp class="samp">pentium2</samp>’</dt>
|
|
<dt>‘<samp class="samp">pentium3</samp>’</dt>
|
|
<dt>‘<samp class="samp">pentium4</samp>’</dt>
|
|
<dt>‘<samp class="samp">k6</samp>’</dt>
|
|
<dt>‘<samp class="samp">k62</samp>’</dt>
|
|
<dt>‘<samp class="samp">athlon</samp>’</dt>
|
|
<dt>‘<samp class="samp">athlonxp</samp>’</dt>
|
|
<dt>‘<samp class="samp">k8</samp>’</dt>
|
|
</dl>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp class="option">-cpucount <var class="var">count</var> (<em class="emph">global</em>)</samp></dt>
|
|
<dd><p>Override detection of CPU count. This option is intended
|
|
for testing. Do not use it unless you know what you’re doing.
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -cpucount 2
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp class="option">-max_alloc <var class="var">bytes</var></samp></dt>
|
|
<dd><p>Set the maximum size limit for allocating a block on the heap by ffmpeg’s
|
|
family of malloc functions. Exercise <strong class="strong">extreme caution</strong> when using
|
|
this option. Don’t use if you do not understand the full consequence of doing so.
|
|
Default is INT_MAX.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="AVOptions">
|
|
<h3 class="section">3.3 AVOptions</h3>
|
|
|
|
<p>These options are provided directly by the libavformat, libavdevice and
|
|
libavcodec libraries. To see the list of available AVOptions, use the
|
|
<samp class="option">-help</samp> option. They are separated into two categories:
|
|
</p><dl class="table">
|
|
<dt><samp class="option">generic</samp></dt>
|
|
<dd><p>These options can be set for any container, codec or device. Generic options
|
|
are listed under AVFormatContext options for containers/devices and under
|
|
AVCodecContext options for codecs.
|
|
</p></dd>
|
|
<dt><samp class="option">private</samp></dt>
|
|
<dd><p>These options are specific to the given container, device or codec. Private
|
|
options are listed under their corresponding containers/devices/codecs.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>For example to write an ID3v2.3 header instead of a default ID3v2.4 to
|
|
an MP3 file, use the <samp class="option">id3v2_version</samp> private option of the MP3
|
|
muxer:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i input.flac -id3v2_version 3 out.mp3
|
|
</pre></div>
|
|
|
|
<p>All codec AVOptions are per-stream, and thus a stream specifier
|
|
should be attached to them:
|
|
</p><div class="example">
|
|
<pre class="example-preformatted">ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
|
|
</pre></div>
|
|
|
|
<p>In the above example, a multichannel audio stream is mapped twice for output.
|
|
The first instance is encoded with codec ac3 and bitrate 640k.
|
|
The second instance is downmixed to 2 channels and encoded with codec aac. A bitrate of 128k is specified for it using
|
|
absolute index of the output stream.
|
|
</p>
|
|
<p>Note: the <samp class="option">-nooption</samp> syntax cannot be used for boolean
|
|
AVOptions, use <samp class="option">-option 0</samp>/<samp class="option">-option 1</samp>.
|
|
</p>
|
|
<p>Note: the old undocumented way of specifying per-stream AVOptions by
|
|
prepending v/a/s to the options name is now obsolete and will be
|
|
removed soon.
|
|
</p>
|
|
</div>
|
|
<div class="section-level-extent" id="Main-options">
|
|
<h3 class="section">3.4 Main options</h3>
|
|
|
|
<dl class="table">
|
|
<dt><samp class="option">-x <var class="var">width</var></samp></dt>
|
|
<dd><p>Force displayed width.
|
|
</p></dd>
|
|
<dt><samp class="option">-y <var class="var">height</var></samp></dt>
|
|
<dd><p>Force displayed height.
|
|
</p></dd>
|
|
<dt><samp class="option">-fs</samp></dt>
|
|
<dd><p>Start in fullscreen mode.
|
|
</p></dd>
|
|
<dt><samp class="option">-an</samp></dt>
|
|
<dd><p>Disable audio.
|
|
</p></dd>
|
|
<dt><samp class="option">-vn</samp></dt>
|
|
<dd><p>Disable video.
|
|
</p></dd>
|
|
<dt><samp class="option">-sn</samp></dt>
|
|
<dd><p>Disable subtitles.
|
|
</p></dd>
|
|
<dt><samp class="option">-ss <var class="var">pos</var></samp></dt>
|
|
<dd><p>Seek to <var class="var">pos</var>. Note that in most formats it is not possible to seek
|
|
exactly, so <code class="command">ffplay</code> will seek to the nearest seek point to
|
|
<var class="var">pos</var>.
|
|
</p>
|
|
<p><var class="var">pos</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></dd>
|
|
<dt><samp class="option">-t <var class="var">duration</var></samp></dt>
|
|
<dd><p>Play <var class="var">duration</var> seconds of audio/video.
|
|
</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></dd>
|
|
<dt><samp class="option">-bytes</samp></dt>
|
|
<dd><p>Seek by bytes.
|
|
</p></dd>
|
|
<dt><samp class="option">-seek_interval</samp></dt>
|
|
<dd><p>Set custom interval, in seconds, for seeking using left/right keys. Default is 10 seconds.
|
|
</p></dd>
|
|
<dt><samp class="option">-nodisp</samp></dt>
|
|
<dd><p>Disable graphical display.
|
|
</p></dd>
|
|
<dt><samp class="option">-noborder</samp></dt>
|
|
<dd><p>Borderless window.
|
|
</p></dd>
|
|
<dt><samp class="option">-alwaysontop</samp></dt>
|
|
<dd><p>Window always on top. Available on: X11 with SDL >= 2.0.5, Windows SDL >= 2.0.6.
|
|
</p></dd>
|
|
<dt><samp class="option">-volume</samp></dt>
|
|
<dd><p>Set the startup volume. 0 means silence, 100 means no volume reduction or
|
|
amplification. Negative values are treated as 0, values above 100 are treated
|
|
as 100.
|
|
</p></dd>
|
|
<dt><samp class="option">-f <var class="var">fmt</var></samp></dt>
|
|
<dd><p>Force format.
|
|
</p></dd>
|
|
<dt><samp class="option">-window_title <var class="var">title</var></samp></dt>
|
|
<dd><p>Set window title (default is the input filename).
|
|
</p></dd>
|
|
<dt><samp class="option">-left <var class="var">title</var></samp></dt>
|
|
<dd><p>Set the x position for the left of the window (default is a centered window).
|
|
</p></dd>
|
|
<dt><samp class="option">-top <var class="var">title</var></samp></dt>
|
|
<dd><p>Set the y position for the top of the window (default is a centered window).
|
|
</p></dd>
|
|
<dt><samp class="option">-loop <var class="var">number</var></samp></dt>
|
|
<dd><p>Loops movie playback <number> times. 0 means forever.
|
|
</p></dd>
|
|
<dt><samp class="option">-showmode <var class="var">mode</var></samp></dt>
|
|
<dd><p>Set the show mode to use.
|
|
Available values for <var class="var">mode</var> are:
|
|
</p><dl class="table">
|
|
<dt>‘<samp class="samp">0, video</samp>’</dt>
|
|
<dd><p>show video
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">1, waves</samp>’</dt>
|
|
<dd><p>show audio waves
|
|
</p></dd>
|
|
<dt>‘<samp class="samp">2, rdft</samp>’</dt>
|
|
<dd><p>show audio frequency band using RDFT ((Inverse) Real Discrete Fourier Transform)
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>Default value is "video", if video is not present or cannot be played
|
|
"rdft" is automatically selected.
|
|
</p>
|
|
<p>You can interactively cycle through the available show modes by
|
|
pressing the key <kbd class="key">w</kbd>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-vf <var class="var">filtergraph</var></samp></dt>
|
|
<dd><p>Create the filtergraph specified by <var class="var">filtergraph</var> and use it to
|
|
filter the video stream.
|
|
</p>
|
|
<p><var class="var">filtergraph</var> is a description of the filtergraph to apply to
|
|
the stream, and must have a single video input and a single video
|
|
output. In the filtergraph, the input is associated to the label
|
|
<code class="code">in</code>, and the output to the label <code class="code">out</code>. See the
|
|
ffmpeg-filters manual for more information about the filtergraph
|
|
syntax.
|
|
</p>
|
|
<p>You can specify this parameter multiple times and cycle through the specified
|
|
filtergraphs along with the show modes by pressing the key <kbd class="key">w</kbd>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-af <var class="var">filtergraph</var></samp></dt>
|
|
<dd><p><var class="var">filtergraph</var> is a description of the filtergraph to apply to
|
|
the input audio.
|
|
Use the option "-filters" to show all the available filters (including
|
|
sources and sinks).
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-i <var class="var">input_url</var></samp></dt>
|
|
<dd><p>Read <var class="var">input_url</var>.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="Advanced-options">
|
|
<h3 class="section">3.5 Advanced options</h3>
|
|
<dl class="table">
|
|
<dt><samp class="option">-stats</samp></dt>
|
|
<dd><p>Print several playback statistics, in particular show the stream
|
|
duration, the codec parameters, the current position in the stream and
|
|
the audio/video synchronisation drift. It is shown by default, unless the
|
|
log level is lower than <code class="code">info</code>. Its display can be forced by manually
|
|
specifying this option. To disable it, you need to specify <code class="code">-nostats</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-fast</samp></dt>
|
|
<dd><p>Non-spec-compliant optimizations.
|
|
</p></dd>
|
|
<dt><samp class="option">-genpts</samp></dt>
|
|
<dd><p>Generate pts.
|
|
</p></dd>
|
|
<dt><samp class="option">-sync <var class="var">type</var></samp></dt>
|
|
<dd><p>Set the master clock to audio (<code class="code">type=audio</code>), video
|
|
(<code class="code">type=video</code>) or external (<code class="code">type=ext</code>). Default is audio. The
|
|
master clock is used to control audio-video synchronization. Most media
|
|
players use audio as master clock, but in some cases (streaming or high
|
|
quality broadcast) it is necessary to change that. This option is mainly
|
|
used for debugging purposes.
|
|
</p></dd>
|
|
<dt><samp class="option">-ast <var class="var">audio_stream_specifier</var></samp></dt>
|
|
<dd><p>Select the desired audio stream using the given stream specifier. The stream
|
|
specifiers are described in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. If this option
|
|
is not specified, the "best" audio stream is selected in the program of the
|
|
already selected video stream.
|
|
</p></dd>
|
|
<dt><samp class="option">-vst <var class="var">video_stream_specifier</var></samp></dt>
|
|
<dd><p>Select the desired video stream using the given stream specifier. The stream
|
|
specifiers are described in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. If this option
|
|
is not specified, the "best" video stream is selected.
|
|
</p></dd>
|
|
<dt><samp class="option">-sst <var class="var">subtitle_stream_specifier</var></samp></dt>
|
|
<dd><p>Select the desired subtitle stream using the given stream specifier. The stream
|
|
specifiers are described in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. If this option
|
|
is not specified, the "best" subtitle stream is selected in the program of the
|
|
already selected video or audio stream.
|
|
</p></dd>
|
|
<dt><samp class="option">-autoexit</samp></dt>
|
|
<dd><p>Exit when video is done playing.
|
|
</p></dd>
|
|
<dt><samp class="option">-exitonkeydown</samp></dt>
|
|
<dd><p>Exit if any key is pressed.
|
|
</p></dd>
|
|
<dt><samp class="option">-exitonmousedown</samp></dt>
|
|
<dd><p>Exit if any mouse button is pressed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-codec:<var class="var">media_specifier</var> <var class="var">codec_name</var></samp></dt>
|
|
<dd><p>Force a specific decoder implementation for the stream identified by
|
|
<var class="var">media_specifier</var>, which can assume the values <code class="code">a</code> (audio),
|
|
<code class="code">v</code> (video), and <code class="code">s</code> subtitle.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-acodec <var class="var">codec_name</var></samp></dt>
|
|
<dd><p>Force a specific audio decoder.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-vcodec <var class="var">codec_name</var></samp></dt>
|
|
<dd><p>Force a specific video decoder.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-scodec <var class="var">codec_name</var></samp></dt>
|
|
<dd><p>Force a specific subtitle decoder.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-autorotate</samp></dt>
|
|
<dd><p>Automatically rotate the video according to file metadata. Enabled by
|
|
default, use <samp class="option">-noautorotate</samp> to disable it.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-framedrop</samp></dt>
|
|
<dd><p>Drop video frames if video is out of sync. Enabled by default if the master
|
|
clock is not set to video. Use this option to enable frame dropping for all
|
|
master clock sources, use <samp class="option">-noframedrop</samp> to disable it.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-infbuf</samp></dt>
|
|
<dd><p>Do not limit the input buffer size, read as much data as possible from the
|
|
input as soon as possible. Enabled by default for realtime streams, where data
|
|
may be dropped if not read in time. Use this option to enable infinite buffers
|
|
for all inputs, use <samp class="option">-noinfbuf</samp> to disable it.
|
|
</p>
|
|
</dd>
|
|
<dt><samp class="option">-filter_threads <var class="var">nb_threads</var></samp></dt>
|
|
<dd><p>Defines how many threads are used to process a filter pipeline. Each pipeline
|
|
will produce a thread pool with this many threads available for parallel
|
|
processing. The default is 0 which means that the thread count will be
|
|
determined by the number of available CPUs.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</div>
|
|
<div class="section-level-extent" id="While-playing">
|
|
<h3 class="section">3.6 While playing</h3>
|
|
|
|
<dl class="table">
|
|
<dt><kbd class="key">q, ESC</kbd></dt>
|
|
<dd><p>Quit.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">f</kbd></dt>
|
|
<dd><p>Toggle full screen.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">p, SPC</kbd></dt>
|
|
<dd><p>Pause.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">m</kbd></dt>
|
|
<dd><p>Toggle mute.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">9, 0</kbd></dt>
|
|
<dt><kbd class="key">/, *</kbd></dt>
|
|
<dd><p>Decrease and increase volume respectively.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">a</kbd></dt>
|
|
<dd><p>Cycle audio channel in the current program.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">v</kbd></dt>
|
|
<dd><p>Cycle video channel.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">t</kbd></dt>
|
|
<dd><p>Cycle subtitle channel in the current program.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">c</kbd></dt>
|
|
<dd><p>Cycle program.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">w</kbd></dt>
|
|
<dd><p>Cycle video filters or show modes.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">s</kbd></dt>
|
|
<dd><p>Step to the next frame.
|
|
</p>
|
|
<p>Pause if the stream is not already paused, step to the next video
|
|
frame, and pause.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">left/right</kbd></dt>
|
|
<dd><p>Seek backward/forward 10 seconds.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">down/up</kbd></dt>
|
|
<dd><p>Seek backward/forward 1 minute.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">page down/page up</kbd></dt>
|
|
<dd><p>Seek to the previous/next chapter.
|
|
or if there are no chapters
|
|
Seek backward/forward 10 minutes.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">right mouse click</kbd></dt>
|
|
<dd><p>Seek to percentage in file corresponding to fraction of width.
|
|
</p>
|
|
</dd>
|
|
<dt><kbd class="key">left mouse double-click</kbd></dt>
|
|
<dd><p>Toggle full screen.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
|
|
|
|
</div>
|
|
</div>
|
|
<div class="chapter-level-extent" id="See-Also">
|
|
<h2 class="chapter">4 See Also</h2>
|
|
|
|
<p><a class="url" href="ffplay-all.html">ffmpeg-all</a>,
|
|
<a class="url" href="ffmpeg.html">ffmpeg</a>, <a class="url" href="ffprobe.html">ffprobe</a>,
|
|
<a class="url" href="ffmpeg-utils.html">ffmpeg-utils</a>,
|
|
<a class="url" href="ffmpeg-scaler.html">ffmpeg-scaler</a>,
|
|
<a class="url" href="ffmpeg-resampler.html">ffmpeg-resampler</a>,
|
|
<a class="url" href="ffmpeg-codecs.html">ffmpeg-codecs</a>,
|
|
<a class="url" href="ffmpeg-bitstream-filters.html">ffmpeg-bitstream-filters</a>,
|
|
<a class="url" href="ffmpeg-formats.html">ffmpeg-formats</a>,
|
|
<a class="url" href="ffmpeg-devices.html">ffmpeg-devices</a>,
|
|
<a class="url" href="ffmpeg-protocols.html">ffmpeg-protocols</a>,
|
|
<a class="url" href="ffmpeg-filters.html">ffmpeg-filters</a>
|
|
</p>
|
|
|
|
</div>
|
|
<div class="chapter-level-extent" id="Authors">
|
|
<h2 class="chapter">5 Authors</h2>
|
|
|
|
<p>The FFmpeg developers.
|
|
</p>
|
|
<p>For details about the authorship, see the Git history of the project
|
|
(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
|
|
<code class="command">git log</code> in the FFmpeg source directory, or browsing the
|
|
online repository at <a class="url" href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</a>.
|
|
</p>
|
|
<p>Maintainers for the specific components are listed in the file
|
|
<samp class="file">MAINTAINERS</samp> in the source code tree.
|
|
</p>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|