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| FFmpeg Utilities Documentation |
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| FFmpeg Utilities Documentation |
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| <div class="element-contents" id="SEC_Contents"> |
| <h2 class="contents-heading">Table of Contents</h2> |
|
|
| <div class="contents"> |
|
|
| <ul class="toc-numbered-mark"> |
| <li><a id="toc-Description" href="#Description">1 Description</a></li> |
| <li><a id="toc-Syntax" href="#Syntax">2 Syntax</a> |
| <ul class="toc-numbered-mark"> |
| <li><a id="toc-Quoting-and-escaping" href="#Quoting-and-escaping">2.1 Quoting and escaping</a> |
| <ul class="toc-numbered-mark"> |
| <li><a id="toc-Examples" href="#Examples">2.1.1 Examples</a></li> |
| </ul></li> |
| <li><a id="toc-Date" href="#Date">2.2 Date</a></li> |
| <li><a id="toc-Time-duration" href="#Time-duration">2.3 Time duration</a> |
| <ul class="toc-numbered-mark"> |
| <li><a id="toc-Examples-1" href="#Examples-1">2.3.1 Examples</a></li> |
| </ul></li> |
| <li><a id="toc-Video-size" href="#Video-size">2.4 Video size</a></li> |
| <li><a id="toc-Video-rate" href="#Video-rate">2.5 Video rate</a></li> |
| <li><a id="toc-Ratio" href="#Ratio">2.6 Ratio</a></li> |
| <li><a id="toc-Color" href="#Color">2.7 Color</a></li> |
| <li><a id="toc-Channel-Layout" href="#Channel-Layout">2.8 Channel Layout</a></li> |
| </ul></li> |
| <li><a id="toc-Expression-Evaluation" href="#Expression-Evaluation">3 Expression Evaluation</a></li> |
| <li><a id="toc-See-Also" href="#See-Also">4 See Also</a></li> |
| <li><a id="toc-Authors" href="#Authors">5 Authors</a></li> |
| </ul> |
| </div> |
| </div> |
|
|
| <a name="Description"></a> |
| <h2 class="chapter">1 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description" aria-hidden="true">TOC</a></span></h2> |
|
|
| <p>This document describes some generic features and utilities provided |
| by the libavutil library. |
| </p> |
|
|
| <a name="Syntax"></a> |
| <h2 class="chapter">2 Syntax<span class="pull-right"><a class="anchor hidden-xs" href="#Syntax" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Syntax" aria-hidden="true">TOC</a></span></h2> |
|
|
| <p>This section documents the syntax and formats employed by the FFmpeg |
| libraries and tools. |
| </p> |
| <a class="anchor" id="quoting_005fand_005fescaping"></a><a name="Quoting-and-escaping"></a> |
| <h3 class="section">2.1 Quoting and escaping<span class="pull-right"><a class="anchor hidden-xs" href="#Quoting-and-escaping" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Quoting-and-escaping" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>FFmpeg adopts the following quoting and escaping mechanism, unless |
| explicitly specified. The following rules are applied: |
| </p> |
| <ul class="itemize mark-bullet"> |
| <li>‘<samp class="samp">'</samp>’ and ‘<samp class="samp">\</samp>’ are special characters (respectively used for |
| quoting and escaping). In addition to them, there might be other |
| special characters depending on the specific syntax where the escaping |
| and quoting are employed. |
|
|
| </li><li>A special character is escaped by prefixing it with a ‘<samp class="samp">\</samp>’. |
|
|
| </li><li>All characters enclosed between ‘<samp class="samp">''</samp>’ are included literally in the |
| parsed string. The quote character ‘<samp class="samp">'</samp>’ itself cannot be quoted, |
| so you may need to close the quote and escape it. |
|
|
| </li><li>Leading and trailing whitespaces, unless escaped or quoted, are |
| removed from the parsed string. |
| </li></ul> |
|
|
| <p>Note that you may need to add a second level of escaping when using |
| the command line or a script, which depends on the syntax of the |
| adopted shell language. |
| </p> |
| <p>The function <code class="code">av_get_token</code> defined in |
| <samp class="file">libavutil/avstring.h</samp> can be used to parse a token quoted or |
| escaped according to the rules defined above. |
| </p> |
| <p>The tool <samp class="file">tools/ffescape</samp> in the FFmpeg source tree can be used |
| to automatically quote or escape a string in a script. |
| </p> |
| <a name="Examples"></a> |
| <h4 class="subsection">2.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples" aria-hidden="true">TOC</a></span></h4> |
|
|
| <ul class="itemize mark-bullet"> |
| <li>Escape the string <code class="code">Crime d'Amour</code> containing the <code class="code">'</code> special |
| character: |
| <div class="example"> |
| <pre class="example-preformatted">Crime d\'Amour |
| </pre></div> |
|
|
| </li><li>The string above contains a quote, so the <code class="code">'</code> needs to be escaped |
| when quoting it: |
| <div class="example"> |
| <pre class="example-preformatted">'Crime d'\''Amour' |
| </pre></div> |
|
|
| </li><li>Include leading or trailing whitespaces using quoting: |
| <div class="example"> |
| <pre class="example-preformatted">' this string starts and ends with whitespaces ' |
| </pre></div> |
|
|
| </li><li>Escaping and quoting can be mixed together: |
| <div class="example"> |
| <pre class="example-preformatted">' The string '\'string\'' is a string ' |
| </pre></div> |
|
|
| </li><li>To include a literal ‘<samp class="samp">\</samp>’ you can use either escaping or quoting: |
| <div class="example"> |
| <pre class="example-preformatted">'c:\foo' can be written as c:\\foo |
| </pre></div> |
| </li></ul> |
|
|
| <a class="anchor" id="date-syntax"></a><a name="Date"></a> |
| <h3 class="section">2.2 Date<span class="pull-right"><a class="anchor hidden-xs" href="#Date" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Date" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>The accepted syntax is: |
| </p><div class="example"> |
| <pre class="example-preformatted">[(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z] |
| now |
| </pre></div> |
|
|
| <p>If the value is "now" it takes the current time. |
| </p> |
| <p>Time is local time unless Z is appended, in which case it is |
| interpreted as UTC. |
| If the year-month-day part is not specified it takes the current |
| year-month-day. |
| </p> |
| <a class="anchor" id="time-duration-syntax"></a><a name="Time-duration"></a> |
| <h3 class="section">2.3 Time duration<span class="pull-right"><a class="anchor hidden-xs" href="#Time-duration" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Time-duration" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>There are two accepted syntaxes for expressing time duration. |
| </p> |
| <div class="example"> |
| <pre class="example-preformatted">[-][<var class="var">HH</var>:]<var class="var">MM</var>:<var class="var">SS</var>[.<var class="var">m</var>...] |
| </pre></div> |
|
|
| <p><var class="var">HH</var> expresses the number of hours, <var class="var">MM</var> the number of minutes |
| for a maximum of 2 digits, and <var class="var">SS</var> the number of seconds for a |
| maximum of 2 digits. The <var class="var">m</var> at the end expresses decimal value for |
| <var class="var">SS</var>. |
| </p> |
| <p><em class="emph">or</em> |
| </p> |
| <div class="example"> |
| <pre class="example-preformatted">[-]<var class="var">S</var>+[.<var class="var">m</var>...][s|ms|us] |
| </pre></div> |
|
|
| <p><var class="var">S</var> expresses the number of seconds, with the optional decimal part |
| <var class="var">m</var>. The optional literal suffixes ‘<samp class="samp">s</samp>’, ‘<samp class="samp">ms</samp>’ or ‘<samp class="samp">us</samp>’ |
| indicate to interpret the value as seconds, milliseconds or microseconds, |
| respectively. |
| </p> |
| <p>In both expressions, the optional ‘<samp class="samp">-</samp>’ indicates negative duration. |
| </p> |
| <a name="Examples-1"></a> |
| <h4 class="subsection">2.3.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-1" aria-hidden="true">TOC</a></span></h4> |
|
|
| <p>The following examples are all valid time duration: |
| </p> |
| <dl class="table"> |
| <dt>‘<samp class="samp">55</samp>’</dt> |
| <dd><p>55 seconds |
| </p> |
| </dd> |
| <dt>‘<samp class="samp">0.2</samp>’</dt> |
| <dd><p>0.2 seconds |
| </p> |
| </dd> |
| <dt>‘<samp class="samp">200ms</samp>’</dt> |
| <dd><p>200 milliseconds, that’s 0.2s |
| </p> |
| </dd> |
| <dt>‘<samp class="samp">200000us</samp>’</dt> |
| <dd><p>200000 microseconds, that’s 0.2s |
| </p> |
| </dd> |
| <dt>‘<samp class="samp">12:03:45</samp>’</dt> |
| <dd><p>12 hours, 03 minutes and 45 seconds |
| </p> |
| </dd> |
| <dt>‘<samp class="samp">23.189</samp>’</dt> |
| <dd><p>23.189 seconds |
| </p></dd> |
| </dl> |
|
|
| <a class="anchor" id="video-size-syntax"></a><a name="Video-size"></a> |
| <h3 class="section">2.4 Video size<span class="pull-right"><a class="anchor hidden-xs" href="#Video-size" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-size" aria-hidden="true">TOC</a></span></h3> |
| <p>Specify the size of the sourced video, it may be a string of the form |
| <var class="var">width</var>x<var class="var">height</var>, or the name of a size abbreviation. |
| </p> |
| <p>The following abbreviations are recognized: |
| </p><dl class="table"> |
| <dt>‘<samp class="samp">ntsc</samp>’</dt> |
| <dd><p>720x480 |
| </p></dd> |
| <dt>‘<samp class="samp">pal</samp>’</dt> |
| <dd><p>720x576 |
| </p></dd> |
| <dt>‘<samp class="samp">qntsc</samp>’</dt> |
| <dd><p>352x240 |
| </p></dd> |
| <dt>‘<samp class="samp">qpal</samp>’</dt> |
| <dd><p>352x288 |
| </p></dd> |
| <dt>‘<samp class="samp">sntsc</samp>’</dt> |
| <dd><p>640x480 |
| </p></dd> |
| <dt>‘<samp class="samp">spal</samp>’</dt> |
| <dd><p>768x576 |
| </p></dd> |
| <dt>‘<samp class="samp">film</samp>’</dt> |
| <dd><p>352x240 |
| </p></dd> |
| <dt>‘<samp class="samp">ntsc-film</samp>’</dt> |
| <dd><p>352x240 |
| </p></dd> |
| <dt>‘<samp class="samp">sqcif</samp>’</dt> |
| <dd><p>128x96 |
| </p></dd> |
| <dt>‘<samp class="samp">qcif</samp>’</dt> |
| <dd><p>176x144 |
| </p></dd> |
| <dt>‘<samp class="samp">cif</samp>’</dt> |
| <dd><p>352x288 |
| </p></dd> |
| <dt>‘<samp class="samp">4cif</samp>’</dt> |
| <dd><p>704x576 |
| </p></dd> |
| <dt>‘<samp class="samp">16cif</samp>’</dt> |
| <dd><p>1408x1152 |
| </p></dd> |
| <dt>‘<samp class="samp">qqvga</samp>’</dt> |
| <dd><p>160x120 |
| </p></dd> |
| <dt>‘<samp class="samp">qvga</samp>’</dt> |
| <dd><p>320x240 |
| </p></dd> |
| <dt>‘<samp class="samp">vga</samp>’</dt> |
| <dd><p>640x480 |
| </p></dd> |
| <dt>‘<samp class="samp">svga</samp>’</dt> |
| <dd><p>800x600 |
| </p></dd> |
| <dt>‘<samp class="samp">xga</samp>’</dt> |
| <dd><p>1024x768 |
| </p></dd> |
| <dt>‘<samp class="samp">uxga</samp>’</dt> |
| <dd><p>1600x1200 |
| </p></dd> |
| <dt>‘<samp class="samp">qxga</samp>’</dt> |
| <dd><p>2048x1536 |
| </p></dd> |
| <dt>‘<samp class="samp">sxga</samp>’</dt> |
| <dd><p>1280x1024 |
| </p></dd> |
| <dt>‘<samp class="samp">qsxga</samp>’</dt> |
| <dd><p>2560x2048 |
| </p></dd> |
| <dt>‘<samp class="samp">hsxga</samp>’</dt> |
| <dd><p>5120x4096 |
| </p></dd> |
| <dt>‘<samp class="samp">wvga</samp>’</dt> |
| <dd><p>852x480 |
| </p></dd> |
| <dt>‘<samp class="samp">wxga</samp>’</dt> |
| <dd><p>1366x768 |
| </p></dd> |
| <dt>‘<samp class="samp">wsxga</samp>’</dt> |
| <dd><p>1600x1024 |
| </p></dd> |
| <dt>‘<samp class="samp">wuxga</samp>’</dt> |
| <dd><p>1920x1200 |
| </p></dd> |
| <dt>‘<samp class="samp">woxga</samp>’</dt> |
| <dd><p>2560x1600 |
| </p></dd> |
| <dt>‘<samp class="samp">wqsxga</samp>’</dt> |
| <dd><p>3200x2048 |
| </p></dd> |
| <dt>‘<samp class="samp">wquxga</samp>’</dt> |
| <dd><p>3840x2400 |
| </p></dd> |
| <dt>‘<samp class="samp">whsxga</samp>’</dt> |
| <dd><p>6400x4096 |
| </p></dd> |
| <dt>‘<samp class="samp">whuxga</samp>’</dt> |
| <dd><p>7680x4800 |
| </p></dd> |
| <dt>‘<samp class="samp">cga</samp>’</dt> |
| <dd><p>320x200 |
| </p></dd> |
| <dt>‘<samp class="samp">ega</samp>’</dt> |
| <dd><p>640x350 |
| </p></dd> |
| <dt>‘<samp class="samp">hd480</samp>’</dt> |
| <dd><p>852x480 |
| </p></dd> |
| <dt>‘<samp class="samp">hd720</samp>’</dt> |
| <dd><p>1280x720 |
| </p></dd> |
| <dt>‘<samp class="samp">hd1080</samp>’</dt> |
| <dd><p>1920x1080 |
| </p></dd> |
| <dt>‘<samp class="samp">2k</samp>’</dt> |
| <dd><p>2048x1080 |
| </p></dd> |
| <dt>‘<samp class="samp">2kflat</samp>’</dt> |
| <dd><p>1998x1080 |
| </p></dd> |
| <dt>‘<samp class="samp">2kscope</samp>’</dt> |
| <dd><p>2048x858 |
| </p></dd> |
| <dt>‘<samp class="samp">4k</samp>’</dt> |
| <dd><p>4096x2160 |
| </p></dd> |
| <dt>‘<samp class="samp">4kflat</samp>’</dt> |
| <dd><p>3996x2160 |
| </p></dd> |
| <dt>‘<samp class="samp">4kscope</samp>’</dt> |
| <dd><p>4096x1716 |
| </p></dd> |
| <dt>‘<samp class="samp">nhd</samp>’</dt> |
| <dd><p>640x360 |
| </p></dd> |
| <dt>‘<samp class="samp">hqvga</samp>’</dt> |
| <dd><p>240x160 |
| </p></dd> |
| <dt>‘<samp class="samp">wqvga</samp>’</dt> |
| <dd><p>400x240 |
| </p></dd> |
| <dt>‘<samp class="samp">fwqvga</samp>’</dt> |
| <dd><p>432x240 |
| </p></dd> |
| <dt>‘<samp class="samp">hvga</samp>’</dt> |
| <dd><p>480x320 |
| </p></dd> |
| <dt>‘<samp class="samp">qhd</samp>’</dt> |
| <dd><p>960x540 |
| </p></dd> |
| <dt>‘<samp class="samp">2kdci</samp>’</dt> |
| <dd><p>2048x1080 |
| </p></dd> |
| <dt>‘<samp class="samp">4kdci</samp>’</dt> |
| <dd><p>4096x2160 |
| </p></dd> |
| <dt>‘<samp class="samp">uhd2160</samp>’</dt> |
| <dd><p>3840x2160 |
| </p></dd> |
| <dt>‘<samp class="samp">uhd4320</samp>’</dt> |
| <dd><p>7680x4320 |
| </p></dd> |
| </dl> |
|
|
| <a class="anchor" id="video-rate-syntax"></a><a name="Video-rate"></a> |
| <h3 class="section">2.5 Video rate<span class="pull-right"><a class="anchor hidden-xs" href="#Video-rate" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Video-rate" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>Specify the frame rate of a video, expressed as the number of frames |
| generated per second. It has to be a string in the format |
| <var class="var">frame_rate_num</var>/<var class="var">frame_rate_den</var>, an integer number, a float |
| number or a valid video frame rate abbreviation. |
| </p> |
| <p>The following abbreviations are recognized: |
| </p><dl class="table"> |
| <dt>‘<samp class="samp">ntsc</samp>’</dt> |
| <dd><p>30000/1001 |
| </p></dd> |
| <dt>‘<samp class="samp">pal</samp>’</dt> |
| <dd><p>25/1 |
| </p></dd> |
| <dt>‘<samp class="samp">qntsc</samp>’</dt> |
| <dd><p>30000/1001 |
| </p></dd> |
| <dt>‘<samp class="samp">qpal</samp>’</dt> |
| <dd><p>25/1 |
| </p></dd> |
| <dt>‘<samp class="samp">sntsc</samp>’</dt> |
| <dd><p>30000/1001 |
| </p></dd> |
| <dt>‘<samp class="samp">spal</samp>’</dt> |
| <dd><p>25/1 |
| </p></dd> |
| <dt>‘<samp class="samp">film</samp>’</dt> |
| <dd><p>24/1 |
| </p></dd> |
| <dt>‘<samp class="samp">ntsc-film</samp>’</dt> |
| <dd><p>24000/1001 |
| </p></dd> |
| </dl> |
|
|
| <a class="anchor" id="ratio-syntax"></a><a name="Ratio"></a> |
| <h3 class="section">2.6 Ratio<span class="pull-right"><a class="anchor hidden-xs" href="#Ratio" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Ratio" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>A ratio can be expressed as an expression, or in the form |
| <var class="var">numerator</var>:<var class="var">denominator</var>. |
| </p> |
| <p>Note that a ratio with infinite (1/0) or negative value is |
| considered valid, so you should check on the returned value if you |
| want to exclude those values. |
| </p> |
| <p>The undefined value can be expressed using the "0:0" string. |
| </p> |
| <a class="anchor" id="color-syntax"></a><a name="Color"></a> |
| <h3 class="section">2.7 Color<span class="pull-right"><a class="anchor hidden-xs" href="#Color" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Color" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>It can be the name of a color as defined below (case insensitive match) or a |
| <code class="code">[0x|#]RRGGBB[AA]</code> sequence, possibly followed by @ and a string |
| representing the alpha component. |
| </p> |
| <p>The alpha component may be a string composed by "0x" followed by an |
| hexadecimal number or a decimal number between 0.0 and 1.0, which |
| represents the opacity value (‘<samp class="samp">0x00</samp>’ or ‘<samp class="samp">0.0</samp>’ means completely |
| transparent, ‘<samp class="samp">0xff</samp>’ or ‘<samp class="samp">1.0</samp>’ completely opaque). If the alpha |
| component is not specified then ‘<samp class="samp">0xff</samp>’ is assumed. |
| </p> |
| <p>The string ‘<samp class="samp">random</samp>’ will result in a random color. |
| </p> |
| <p>The following names of colors are recognized: |
| </p><dl class="table"> |
| <dt>‘<samp class="samp">AliceBlue</samp>’</dt> |
| <dd><p>0xF0F8FF |
| </p></dd> |
| <dt>‘<samp class="samp">AntiqueWhite</samp>’</dt> |
| <dd><p>0xFAEBD7 |
| </p></dd> |
| <dt>‘<samp class="samp">Aqua</samp>’</dt> |
| <dd><p>0x00FFFF |
| </p></dd> |
| <dt>‘<samp class="samp">Aquamarine</samp>’</dt> |
| <dd><p>0x7FFFD4 |
| </p></dd> |
| <dt>‘<samp class="samp">Azure</samp>’</dt> |
| <dd><p>0xF0FFFF |
| </p></dd> |
| <dt>‘<samp class="samp">Beige</samp>’</dt> |
| <dd><p>0xF5F5DC |
| </p></dd> |
| <dt>‘<samp class="samp">Bisque</samp>’</dt> |
| <dd><p>0xFFE4C4 |
| </p></dd> |
| <dt>‘<samp class="samp">Black</samp>’</dt> |
| <dd><p>0x000000 |
| </p></dd> |
| <dt>‘<samp class="samp">BlanchedAlmond</samp>’</dt> |
| <dd><p>0xFFEBCD |
| </p></dd> |
| <dt>‘<samp class="samp">Blue</samp>’</dt> |
| <dd><p>0x0000FF |
| </p></dd> |
| <dt>‘<samp class="samp">BlueViolet</samp>’</dt> |
| <dd><p>0x8A2BE2 |
| </p></dd> |
| <dt>‘<samp class="samp">Brown</samp>’</dt> |
| <dd><p>0xA52A2A |
| </p></dd> |
| <dt>‘<samp class="samp">BurlyWood</samp>’</dt> |
| <dd><p>0xDEB887 |
| </p></dd> |
| <dt>‘<samp class="samp">CadetBlue</samp>’</dt> |
| <dd><p>0x5F9EA0 |
| </p></dd> |
| <dt>‘<samp class="samp">Chartreuse</samp>’</dt> |
| <dd><p>0x7FFF00 |
| </p></dd> |
| <dt>‘<samp class="samp">Chocolate</samp>’</dt> |
| <dd><p>0xD2691E |
| </p></dd> |
| <dt>‘<samp class="samp">Coral</samp>’</dt> |
| <dd><p>0xFF7F50 |
| </p></dd> |
| <dt>‘<samp class="samp">CornflowerBlue</samp>’</dt> |
| <dd><p>0x6495ED |
| </p></dd> |
| <dt>‘<samp class="samp">Cornsilk</samp>’</dt> |
| <dd><p>0xFFF8DC |
| </p></dd> |
| <dt>‘<samp class="samp">Crimson</samp>’</dt> |
| <dd><p>0xDC143C |
| </p></dd> |
| <dt>‘<samp class="samp">Cyan</samp>’</dt> |
| <dd><p>0x00FFFF |
| </p></dd> |
| <dt>‘<samp class="samp">DarkBlue</samp>’</dt> |
| <dd><p>0x00008B |
| </p></dd> |
| <dt>‘<samp class="samp">DarkCyan</samp>’</dt> |
| <dd><p>0x008B8B |
| </p></dd> |
| <dt>‘<samp class="samp">DarkGoldenRod</samp>’</dt> |
| <dd><p>0xB8860B |
| </p></dd> |
| <dt>‘<samp class="samp">DarkGray</samp>’</dt> |
| <dd><p>0xA9A9A9 |
| </p></dd> |
| <dt>‘<samp class="samp">DarkGreen</samp>’</dt> |
| <dd><p>0x006400 |
| </p></dd> |
| <dt>‘<samp class="samp">DarkKhaki</samp>’</dt> |
| <dd><p>0xBDB76B |
| </p></dd> |
| <dt>‘<samp class="samp">DarkMagenta</samp>’</dt> |
| <dd><p>0x8B008B |
| </p></dd> |
| <dt>‘<samp class="samp">DarkOliveGreen</samp>’</dt> |
| <dd><p>0x556B2F |
| </p></dd> |
| <dt>‘<samp class="samp">Darkorange</samp>’</dt> |
| <dd><p>0xFF8C00 |
| </p></dd> |
| <dt>‘<samp class="samp">DarkOrchid</samp>’</dt> |
| <dd><p>0x9932CC |
| </p></dd> |
| <dt>‘<samp class="samp">DarkRed</samp>’</dt> |
| <dd><p>0x8B0000 |
| </p></dd> |
| <dt>‘<samp class="samp">DarkSalmon</samp>’</dt> |
| <dd><p>0xE9967A |
| </p></dd> |
| <dt>‘<samp class="samp">DarkSeaGreen</samp>’</dt> |
| <dd><p>0x8FBC8F |
| </p></dd> |
| <dt>‘<samp class="samp">DarkSlateBlue</samp>’</dt> |
| <dd><p>0x483D8B |
| </p></dd> |
| <dt>‘<samp class="samp">DarkSlateGray</samp>’</dt> |
| <dd><p>0x2F4F4F |
| </p></dd> |
| <dt>‘<samp class="samp">DarkTurquoise</samp>’</dt> |
| <dd><p>0x00CED1 |
| </p></dd> |
| <dt>‘<samp class="samp">DarkViolet</samp>’</dt> |
| <dd><p>0x9400D3 |
| </p></dd> |
| <dt>‘<samp class="samp">DeepPink</samp>’</dt> |
| <dd><p>0xFF1493 |
| </p></dd> |
| <dt>‘<samp class="samp">DeepSkyBlue</samp>’</dt> |
| <dd><p>0x00BFFF |
| </p></dd> |
| <dt>‘<samp class="samp">DimGray</samp>’</dt> |
| <dd><p>0x696969 |
| </p></dd> |
| <dt>‘<samp class="samp">DodgerBlue</samp>’</dt> |
| <dd><p>0x1E90FF |
| </p></dd> |
| <dt>‘<samp class="samp">FireBrick</samp>’</dt> |
| <dd><p>0xB22222 |
| </p></dd> |
| <dt>‘<samp class="samp">FloralWhite</samp>’</dt> |
| <dd><p>0xFFFAF0 |
| </p></dd> |
| <dt>‘<samp class="samp">ForestGreen</samp>’</dt> |
| <dd><p>0x228B22 |
| </p></dd> |
| <dt>‘<samp class="samp">Fuchsia</samp>’</dt> |
| <dd><p>0xFF00FF |
| </p></dd> |
| <dt>‘<samp class="samp">Gainsboro</samp>’</dt> |
| <dd><p>0xDCDCDC |
| </p></dd> |
| <dt>‘<samp class="samp">GhostWhite</samp>’</dt> |
| <dd><p>0xF8F8FF |
| </p></dd> |
| <dt>‘<samp class="samp">Gold</samp>’</dt> |
| <dd><p>0xFFD700 |
| </p></dd> |
| <dt>‘<samp class="samp">GoldenRod</samp>’</dt> |
| <dd><p>0xDAA520 |
| </p></dd> |
| <dt>‘<samp class="samp">Gray</samp>’</dt> |
| <dd><p>0x808080 |
| </p></dd> |
| <dt>‘<samp class="samp">Green</samp>’</dt> |
| <dd><p>0x008000 |
| </p></dd> |
| <dt>‘<samp class="samp">GreenYellow</samp>’</dt> |
| <dd><p>0xADFF2F |
| </p></dd> |
| <dt>‘<samp class="samp">HoneyDew</samp>’</dt> |
| <dd><p>0xF0FFF0 |
| </p></dd> |
| <dt>‘<samp class="samp">HotPink</samp>’</dt> |
| <dd><p>0xFF69B4 |
| </p></dd> |
| <dt>‘<samp class="samp">IndianRed</samp>’</dt> |
| <dd><p>0xCD5C5C |
| </p></dd> |
| <dt>‘<samp class="samp">Indigo</samp>’</dt> |
| <dd><p>0x4B0082 |
| </p></dd> |
| <dt>‘<samp class="samp">Ivory</samp>’</dt> |
| <dd><p>0xFFFFF0 |
| </p></dd> |
| <dt>‘<samp class="samp">Khaki</samp>’</dt> |
| <dd><p>0xF0E68C |
| </p></dd> |
| <dt>‘<samp class="samp">Lavender</samp>’</dt> |
| <dd><p>0xE6E6FA |
| </p></dd> |
| <dt>‘<samp class="samp">LavenderBlush</samp>’</dt> |
| <dd><p>0xFFF0F5 |
| </p></dd> |
| <dt>‘<samp class="samp">LawnGreen</samp>’</dt> |
| <dd><p>0x7CFC00 |
| </p></dd> |
| <dt>‘<samp class="samp">LemonChiffon</samp>’</dt> |
| <dd><p>0xFFFACD |
| </p></dd> |
| <dt>‘<samp class="samp">LightBlue</samp>’</dt> |
| <dd><p>0xADD8E6 |
| </p></dd> |
| <dt>‘<samp class="samp">LightCoral</samp>’</dt> |
| <dd><p>0xF08080 |
| </p></dd> |
| <dt>‘<samp class="samp">LightCyan</samp>’</dt> |
| <dd><p>0xE0FFFF |
| </p></dd> |
| <dt>‘<samp class="samp">LightGoldenRodYellow</samp>’</dt> |
| <dd><p>0xFAFAD2 |
| </p></dd> |
| <dt>‘<samp class="samp">LightGreen</samp>’</dt> |
| <dd><p>0x90EE90 |
| </p></dd> |
| <dt>‘<samp class="samp">LightGrey</samp>’</dt> |
| <dd><p>0xD3D3D3 |
| </p></dd> |
| <dt>‘<samp class="samp">LightPink</samp>’</dt> |
| <dd><p>0xFFB6C1 |
| </p></dd> |
| <dt>‘<samp class="samp">LightSalmon</samp>’</dt> |
| <dd><p>0xFFA07A |
| </p></dd> |
| <dt>‘<samp class="samp">LightSeaGreen</samp>’</dt> |
| <dd><p>0x20B2AA |
| </p></dd> |
| <dt>‘<samp class="samp">LightSkyBlue</samp>’</dt> |
| <dd><p>0x87CEFA |
| </p></dd> |
| <dt>‘<samp class="samp">LightSlateGray</samp>’</dt> |
| <dd><p>0x778899 |
| </p></dd> |
| <dt>‘<samp class="samp">LightSteelBlue</samp>’</dt> |
| <dd><p>0xB0C4DE |
| </p></dd> |
| <dt>‘<samp class="samp">LightYellow</samp>’</dt> |
| <dd><p>0xFFFFE0 |
| </p></dd> |
| <dt>‘<samp class="samp">Lime</samp>’</dt> |
| <dd><p>0x00FF00 |
| </p></dd> |
| <dt>‘<samp class="samp">LimeGreen</samp>’</dt> |
| <dd><p>0x32CD32 |
| </p></dd> |
| <dt>‘<samp class="samp">Linen</samp>’</dt> |
| <dd><p>0xFAF0E6 |
| </p></dd> |
| <dt>‘<samp class="samp">Magenta</samp>’</dt> |
| <dd><p>0xFF00FF |
| </p></dd> |
| <dt>‘<samp class="samp">Maroon</samp>’</dt> |
| <dd><p>0x800000 |
| </p></dd> |
| <dt>‘<samp class="samp">MediumAquaMarine</samp>’</dt> |
| <dd><p>0x66CDAA |
| </p></dd> |
| <dt>‘<samp class="samp">MediumBlue</samp>’</dt> |
| <dd><p>0x0000CD |
| </p></dd> |
| <dt>‘<samp class="samp">MediumOrchid</samp>’</dt> |
| <dd><p>0xBA55D3 |
| </p></dd> |
| <dt>‘<samp class="samp">MediumPurple</samp>’</dt> |
| <dd><p>0x9370D8 |
| </p></dd> |
| <dt>‘<samp class="samp">MediumSeaGreen</samp>’</dt> |
| <dd><p>0x3CB371 |
| </p></dd> |
| <dt>‘<samp class="samp">MediumSlateBlue</samp>’</dt> |
| <dd><p>0x7B68EE |
| </p></dd> |
| <dt>‘<samp class="samp">MediumSpringGreen</samp>’</dt> |
| <dd><p>0x00FA9A |
| </p></dd> |
| <dt>‘<samp class="samp">MediumTurquoise</samp>’</dt> |
| <dd><p>0x48D1CC |
| </p></dd> |
| <dt>‘<samp class="samp">MediumVioletRed</samp>’</dt> |
| <dd><p>0xC71585 |
| </p></dd> |
| <dt>‘<samp class="samp">MidnightBlue</samp>’</dt> |
| <dd><p>0x191970 |
| </p></dd> |
| <dt>‘<samp class="samp">MintCream</samp>’</dt> |
| <dd><p>0xF5FFFA |
| </p></dd> |
| <dt>‘<samp class="samp">MistyRose</samp>’</dt> |
| <dd><p>0xFFE4E1 |
| </p></dd> |
| <dt>‘<samp class="samp">Moccasin</samp>’</dt> |
| <dd><p>0xFFE4B5 |
| </p></dd> |
| <dt>‘<samp class="samp">NavajoWhite</samp>’</dt> |
| <dd><p>0xFFDEAD |
| </p></dd> |
| <dt>‘<samp class="samp">Navy</samp>’</dt> |
| <dd><p>0x000080 |
| </p></dd> |
| <dt>‘<samp class="samp">OldLace</samp>’</dt> |
| <dd><p>0xFDF5E6 |
| </p></dd> |
| <dt>‘<samp class="samp">Olive</samp>’</dt> |
| <dd><p>0x808000 |
| </p></dd> |
| <dt>‘<samp class="samp">OliveDrab</samp>’</dt> |
| <dd><p>0x6B8E23 |
| </p></dd> |
| <dt>‘<samp class="samp">Orange</samp>’</dt> |
| <dd><p>0xFFA500 |
| </p></dd> |
| <dt>‘<samp class="samp">OrangeRed</samp>’</dt> |
| <dd><p>0xFF4500 |
| </p></dd> |
| <dt>‘<samp class="samp">Orchid</samp>’</dt> |
| <dd><p>0xDA70D6 |
| </p></dd> |
| <dt>‘<samp class="samp">PaleGoldenRod</samp>’</dt> |
| <dd><p>0xEEE8AA |
| </p></dd> |
| <dt>‘<samp class="samp">PaleGreen</samp>’</dt> |
| <dd><p>0x98FB98 |
| </p></dd> |
| <dt>‘<samp class="samp">PaleTurquoise</samp>’</dt> |
| <dd><p>0xAFEEEE |
| </p></dd> |
| <dt>‘<samp class="samp">PaleVioletRed</samp>’</dt> |
| <dd><p>0xD87093 |
| </p></dd> |
| <dt>‘<samp class="samp">PapayaWhip</samp>’</dt> |
| <dd><p>0xFFEFD5 |
| </p></dd> |
| <dt>‘<samp class="samp">PeachPuff</samp>’</dt> |
| <dd><p>0xFFDAB9 |
| </p></dd> |
| <dt>‘<samp class="samp">Peru</samp>’</dt> |
| <dd><p>0xCD853F |
| </p></dd> |
| <dt>‘<samp class="samp">Pink</samp>’</dt> |
| <dd><p>0xFFC0CB |
| </p></dd> |
| <dt>‘<samp class="samp">Plum</samp>’</dt> |
| <dd><p>0xDDA0DD |
| </p></dd> |
| <dt>‘<samp class="samp">PowderBlue</samp>’</dt> |
| <dd><p>0xB0E0E6 |
| </p></dd> |
| <dt>‘<samp class="samp">Purple</samp>’</dt> |
| <dd><p>0x800080 |
| </p></dd> |
| <dt>‘<samp class="samp">Red</samp>’</dt> |
| <dd><p>0xFF0000 |
| </p></dd> |
| <dt>‘<samp class="samp">RosyBrown</samp>’</dt> |
| <dd><p>0xBC8F8F |
| </p></dd> |
| <dt>‘<samp class="samp">RoyalBlue</samp>’</dt> |
| <dd><p>0x4169E1 |
| </p></dd> |
| <dt>‘<samp class="samp">SaddleBrown</samp>’</dt> |
| <dd><p>0x8B4513 |
| </p></dd> |
| <dt>‘<samp class="samp">Salmon</samp>’</dt> |
| <dd><p>0xFA8072 |
| </p></dd> |
| <dt>‘<samp class="samp">SandyBrown</samp>’</dt> |
| <dd><p>0xF4A460 |
| </p></dd> |
| <dt>‘<samp class="samp">SeaGreen</samp>’</dt> |
| <dd><p>0x2E8B57 |
| </p></dd> |
| <dt>‘<samp class="samp">SeaShell</samp>’</dt> |
| <dd><p>0xFFF5EE |
| </p></dd> |
| <dt>‘<samp class="samp">Sienna</samp>’</dt> |
| <dd><p>0xA0522D |
| </p></dd> |
| <dt>‘<samp class="samp">Silver</samp>’</dt> |
| <dd><p>0xC0C0C0 |
| </p></dd> |
| <dt>‘<samp class="samp">SkyBlue</samp>’</dt> |
| <dd><p>0x87CEEB |
| </p></dd> |
| <dt>‘<samp class="samp">SlateBlue</samp>’</dt> |
| <dd><p>0x6A5ACD |
| </p></dd> |
| <dt>‘<samp class="samp">SlateGray</samp>’</dt> |
| <dd><p>0x708090 |
| </p></dd> |
| <dt>‘<samp class="samp">Snow</samp>’</dt> |
| <dd><p>0xFFFAFA |
| </p></dd> |
| <dt>‘<samp class="samp">SpringGreen</samp>’</dt> |
| <dd><p>0x00FF7F |
| </p></dd> |
| <dt>‘<samp class="samp">SteelBlue</samp>’</dt> |
| <dd><p>0x4682B4 |
| </p></dd> |
| <dt>‘<samp class="samp">Tan</samp>’</dt> |
| <dd><p>0xD2B48C |
| </p></dd> |
| <dt>‘<samp class="samp">Teal</samp>’</dt> |
| <dd><p>0x008080 |
| </p></dd> |
| <dt>‘<samp class="samp">Thistle</samp>’</dt> |
| <dd><p>0xD8BFD8 |
| </p></dd> |
| <dt>‘<samp class="samp">Tomato</samp>’</dt> |
| <dd><p>0xFF6347 |
| </p></dd> |
| <dt>‘<samp class="samp">Turquoise</samp>’</dt> |
| <dd><p>0x40E0D0 |
| </p></dd> |
| <dt>‘<samp class="samp">Violet</samp>’</dt> |
| <dd><p>0xEE82EE |
| </p></dd> |
| <dt>‘<samp class="samp">Wheat</samp>’</dt> |
| <dd><p>0xF5DEB3 |
| </p></dd> |
| <dt>‘<samp class="samp">White</samp>’</dt> |
| <dd><p>0xFFFFFF |
| </p></dd> |
| <dt>‘<samp class="samp">WhiteSmoke</samp>’</dt> |
| <dd><p>0xF5F5F5 |
| </p></dd> |
| <dt>‘<samp class="samp">Yellow</samp>’</dt> |
| <dd><p>0xFFFF00 |
| </p></dd> |
| <dt>‘<samp class="samp">YellowGreen</samp>’</dt> |
| <dd><p>0x9ACD32 |
| </p></dd> |
| </dl> |
|
|
| <a class="anchor" id="channel-layout-syntax"></a><a name="Channel-Layout"></a> |
| <h3 class="section">2.8 Channel Layout<span class="pull-right"><a class="anchor hidden-xs" href="#Channel-Layout" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Channel-Layout" aria-hidden="true">TOC</a></span></h3> |
|
|
| <p>A channel layout specifies the spatial disposition of the channels in |
| a multi-channel audio stream. To specify a channel layout, FFmpeg |
| makes use of a special syntax. |
| </p> |
| <p>Individual channels are identified by an id, as given by the table |
| below: |
| </p><dl class="table"> |
| <dt>‘<samp class="samp">FL</samp>’</dt> |
| <dd><p>front left |
| </p></dd> |
| <dt>‘<samp class="samp">FR</samp>’</dt> |
| <dd><p>front right |
| </p></dd> |
| <dt>‘<samp class="samp">FC</samp>’</dt> |
| <dd><p>front center |
| </p></dd> |
| <dt>‘<samp class="samp">LFE</samp>’</dt> |
| <dd><p>low frequency |
| </p></dd> |
| <dt>‘<samp class="samp">BL</samp>’</dt> |
| <dd><p>back left |
| </p></dd> |
| <dt>‘<samp class="samp">BR</samp>’</dt> |
| <dd><p>back right |
| </p></dd> |
| <dt>‘<samp class="samp">FLC</samp>’</dt> |
| <dd><p>front left-of-center |
| </p></dd> |
| <dt>‘<samp class="samp">FRC</samp>’</dt> |
| <dd><p>front right-of-center |
| </p></dd> |
| <dt>‘<samp class="samp">BC</samp>’</dt> |
| <dd><p>back center |
| </p></dd> |
| <dt>‘<samp class="samp">SL</samp>’</dt> |
| <dd><p>side left |
| </p></dd> |
| <dt>‘<samp class="samp">SR</samp>’</dt> |
| <dd><p>side right |
| </p></dd> |
| <dt>‘<samp class="samp">TC</samp>’</dt> |
| <dd><p>top center |
| </p></dd> |
| <dt>‘<samp class="samp">TFL</samp>’</dt> |
| <dd><p>top front left |
| </p></dd> |
| <dt>‘<samp class="samp">TFC</samp>’</dt> |
| <dd><p>top front center |
| </p></dd> |
| <dt>‘<samp class="samp">TFR</samp>’</dt> |
| <dd><p>top front right |
| </p></dd> |
| <dt>‘<samp class="samp">TBL</samp>’</dt> |
| <dd><p>top back left |
| </p></dd> |
| <dt>‘<samp class="samp">TBC</samp>’</dt> |
| <dd><p>top back center |
| </p></dd> |
| <dt>‘<samp class="samp">TBR</samp>’</dt> |
| <dd><p>top back right |
| </p></dd> |
| <dt>‘<samp class="samp">DL</samp>’</dt> |
| <dd><p>downmix left |
| </p></dd> |
| <dt>‘<samp class="samp">DR</samp>’</dt> |
| <dd><p>downmix right |
| </p></dd> |
| <dt>‘<samp class="samp">WL</samp>’</dt> |
| <dd><p>wide left |
| </p></dd> |
| <dt>‘<samp class="samp">WR</samp>’</dt> |
| <dd><p>wide right |
| </p></dd> |
| <dt>‘<samp class="samp">SDL</samp>’</dt> |
| <dd><p>surround direct left |
| </p></dd> |
| <dt>‘<samp class="samp">SDR</samp>’</dt> |
| <dd><p>surround direct right |
| </p></dd> |
| <dt>‘<samp class="samp">LFE2</samp>’</dt> |
| <dd><p>low frequency 2 |
| </p></dd> |
| </dl> |
|
|
| <p>Standard channel layout compositions can be specified by using the |
| following identifiers: |
| </p><dl class="table"> |
| <dt>‘<samp class="samp">mono</samp>’</dt> |
| <dd><p>FC |
| </p></dd> |
| <dt>‘<samp class="samp">stereo</samp>’</dt> |
| <dd><p>FL+FR |
| </p></dd> |
| <dt>‘<samp class="samp">2.1</samp>’</dt> |
| <dd><p>FL+FR+LFE |
| </p></dd> |
| <dt>‘<samp class="samp">3.0</samp>’</dt> |
| <dd><p>FL+FR+FC |
| </p></dd> |
| <dt>‘<samp class="samp">3.0(back)</samp>’</dt> |
| <dd><p>FL+FR+BC |
| </p></dd> |
| <dt>‘<samp class="samp">4.0</samp>’</dt> |
| <dd><p>FL+FR+FC+BC |
| </p></dd> |
| <dt>‘<samp class="samp">quad</samp>’</dt> |
| <dd><p>FL+FR+BL+BR |
| </p></dd> |
| <dt>‘<samp class="samp">quad(side)</samp>’</dt> |
| <dd><p>FL+FR+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">3.1</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE |
| </p></dd> |
| <dt>‘<samp class="samp">5.0</samp>’</dt> |
| <dd><p>FL+FR+FC+BL+BR |
| </p></dd> |
| <dt>‘<samp class="samp">5.0(side)</samp>’</dt> |
| <dd><p>FL+FR+FC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">4.1</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BC |
| </p></dd> |
| <dt>‘<samp class="samp">5.1</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR |
| </p></dd> |
| <dt>‘<samp class="samp">5.1(side)</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">6.0</samp>’</dt> |
| <dd><p>FL+FR+FC+BC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">6.0(front)</samp>’</dt> |
| <dd><p>FL+FR+FLC+FRC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">3.1.2</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+TFL+TFR |
| </p></dd> |
| <dt>‘<samp class="samp">hexagonal</samp>’</dt> |
| <dd><p>FL+FR+FC+BL+BR+BC |
| </p></dd> |
| <dt>‘<samp class="samp">6.1</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">6.1</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+BC |
| </p></dd> |
| <dt>‘<samp class="samp">6.1(front)</samp>’</dt> |
| <dd><p>FL+FR+LFE+FLC+FRC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">7.0</samp>’</dt> |
| <dd><p>FL+FR+FC+BL+BR+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">7.0(front)</samp>’</dt> |
| <dd><p>FL+FR+FC+FLC+FRC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">7.1</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">7.1(wide)</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC |
| </p></dd> |
| <dt>‘<samp class="samp">7.1(wide-side)</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+FLC+FRC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">5.1.2</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+TFL+TFR |
| </p></dd> |
| <dt>‘<samp class="samp">octagonal</samp>’</dt> |
| <dd><p>FL+FR+FC+BL+BR+BC+SL+SR |
| </p></dd> |
| <dt>‘<samp class="samp">cube</samp>’</dt> |
| <dd><p>FL+FR+BL+BR+TFL+TFR+TBL+TBR |
| </p></dd> |
| <dt>‘<samp class="samp">5.1.4</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+TFL+TFR+TBL+TBR |
| </p></dd> |
| <dt>‘<samp class="samp">7.1.2</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR |
| </p></dd> |
| <dt>‘<samp class="samp">7.1.4</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBL+TBR |
| </p></dd> |
| <dt>‘<samp class="samp">7.2.3</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBC+LFE2 |
| </p></dd> |
| <dt>‘<samp class="samp">9.1.4</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR |
| </p></dd> |
| <dt>‘<samp class="samp">9.1.6</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR+TSL+TSR |
| </p></dd> |
| <dt>‘<samp class="samp">hexadecagonal</samp>’</dt> |
| <dd><p>FL+FR+FC+BL+BR+BC+SL+SR+WL+WR+TBL+TBR+TBC+TFC+TFL+TFR |
| </p></dd> |
| <dt>‘<samp class="samp">binaural</samp>’</dt> |
| <dd><p>BIL+BIR |
| </p></dd> |
| <dt>‘<samp class="samp">downmix</samp>’</dt> |
| <dd><p>DL+DR |
| </p></dd> |
| <dt>‘<samp class="samp">22.2</samp>’</dt> |
| <dd><p>FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+LFE2+TSL+TSR+BFC+BFL+BFR |
| </p></dd> |
| </dl> |
|
|
| <p>A custom channel layout can be specified as a sequence of terms, separated by ’+’. |
| Each term can be: |
| </p><ul class="itemize mark-bullet"> |
| <li>the name of a single channel (e.g. ‘<samp class="samp">FL</samp>’, ‘<samp class="samp">FR</samp>’, ‘<samp class="samp">FC</samp>’, ‘<samp class="samp">LFE</samp>’, etc.), |
| each optionally containing a custom name after a ’@’, (e.g. ‘<samp class="samp">FL@Left</samp>’, |
| ‘<samp class="samp">FR@Right</samp>’, ‘<samp class="samp">FC@Center</samp>’, ‘<samp class="samp">LFE@Low_Frequency</samp>’, etc.) |
| </li></ul> |
|
|
| <p>A standard channel layout can be specified by the following: |
| </p><ul class="itemize mark-bullet"> |
| <li>the name of a single channel (e.g. ‘<samp class="samp">FL</samp>’, ‘<samp class="samp">FR</samp>’, ‘<samp class="samp">FC</samp>’, ‘<samp class="samp">LFE</samp>’, etc.) |
|
|
| </li><li>the name of a standard channel layout (e.g. ‘<samp class="samp">mono</samp>’, |
| ‘<samp class="samp">stereo</samp>’, ‘<samp class="samp">4.0</samp>’, ‘<samp class="samp">quad</samp>’, ‘<samp class="samp">5.0</samp>’, etc.) |
|
|
| </li><li>a number of channels, in decimal, followed by ’c’, yielding the default channel |
| layout for that number of channels (see the function |
| <code class="code">av_channel_layout_default</code>). Note that not all channel counts have a |
| default layout. |
|
|
| </li><li>a number of channels, in decimal, followed by ’C’, yielding an unknown channel |
| layout with the specified number of channels. Note that not all channel layout |
| specification strings support unknown channel layouts. |
|
|
| </li><li>a channel layout mask, in hexadecimal starting with "0x" (see the |
| <code class="code">AV_CH_*</code> macros in <samp class="file">libavutil/channel_layout.h</samp>. |
| </li></ul> |
|
|
| <p>Before libavutil version 53 the trailing character "c" to specify a number of |
| channels was optional, but now it is required, while a channel layout mask can |
| also be specified as a decimal number (if and only if not followed by "c" or "C"). |
| </p> |
| <p>See also the function <code class="code">av_channel_layout_from_string</code> defined in |
| <samp class="file">libavutil/channel_layout.h</samp>. |
| </p> |
| <a name="Expression-Evaluation"></a> |
| <h2 class="chapter">3 Expression Evaluation<span class="pull-right"><a class="anchor hidden-xs" href="#Expression-Evaluation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Expression-Evaluation" aria-hidden="true">TOC</a></span></h2> |
|
|
| <p>When evaluating an arithmetic expression, FFmpeg uses an internal |
| formula evaluator, implemented through the <samp class="file">libavutil/eval.h</samp> |
| interface. |
| </p> |
| <p>An expression may contain unary, binary operators, constants, and |
| functions. |
| </p> |
| <p>Two expressions <var class="var">expr1</var> and <var class="var">expr2</var> can be combined to form |
| another expression "<var class="var">expr1</var>;<var class="var">expr2</var>". |
| <var class="var">expr1</var> and <var class="var">expr2</var> are evaluated in turn, and the new |
| expression evaluates to the value of <var class="var">expr2</var>. |
| </p> |
| <p>The following binary operators are available: <code class="code">+</code>, <code class="code">-</code>, |
| <code class="code">*</code>, <code class="code">/</code>, <code class="code">^</code>. |
| </p> |
| <p>The following unary operators are available: <code class="code">+</code>, <code class="code">-</code>. |
| </p> |
| <p>Some internal variables can be used to store and load intermediary |
| results. They can be accessed using the <code class="code">ld</code> and <code class="code">st</code> |
| functions with an index argument varying from 0 to 9 to specify which |
| internal variable to access. |
| </p> |
| <p>The following functions are available: |
| </p><dl class="table"> |
| <dt><samp class="option">abs(x)</samp></dt> |
| <dd><p>Compute absolute value of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">acos(x)</samp></dt> |
| <dd><p>Compute arccosine of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">asin(x)</samp></dt> |
| <dd><p>Compute arcsine of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">atan(x)</samp></dt> |
| <dd><p>Compute arctangent of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">atan2(y, x)</samp></dt> |
| <dd><p>Compute principal value of the arc tangent of <var class="var">y</var>/<var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">between(x, min, max)</samp></dt> |
| <dd><p>Return 1 if <var class="var">x</var> is greater than or equal to <var class="var">min</var> and lesser than or |
| equal to <var class="var">max</var>, 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">bitand(x, y)</samp></dt> |
| <dt><samp class="option">bitor(x, y)</samp></dt> |
| <dd><p>Compute bitwise and/or operation on <var class="var">x</var> and <var class="var">y</var>. |
| </p> |
| <p>The results of the evaluation of <var class="var">x</var> and <var class="var">y</var> are converted to |
| integers before executing the bitwise operation. |
| </p> |
| <p>Note that both the conversion to integer and the conversion back to |
| floating point can lose precision. Beware of unexpected results for |
| large numbers (usually 2^53 and larger). |
| </p> |
| </dd> |
| <dt><samp class="option">ceil(expr)</samp></dt> |
| <dd><p>Round the value of expression <var class="var">expr</var> upwards to the nearest |
| integer. For example, "ceil(1.5)" is "2.0". |
| </p> |
| </dd> |
| <dt><samp class="option">clip(x, min, max)</samp></dt> |
| <dd><p>Return the value of <var class="var">x</var> clipped between <var class="var">min</var> and <var class="var">max</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">cos(x)</samp></dt> |
| <dd><p>Compute cosine of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">cosh(x)</samp></dt> |
| <dd><p>Compute hyperbolic cosine of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">eq(x, y)</samp></dt> |
| <dd><p>Return 1 if <var class="var">x</var> and <var class="var">y</var> are equivalent, 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">exp(x)</samp></dt> |
| <dd><p>Compute exponential of <var class="var">x</var> (with base <code class="code">e</code>, the Euler’s number). |
| </p> |
| </dd> |
| <dt><samp class="option">floor(expr)</samp></dt> |
| <dd><p>Round the value of expression <var class="var">expr</var> downwards to the nearest |
| integer. For example, "floor(-1.5)" is "-2.0". |
| </p> |
| </dd> |
| <dt><samp class="option">gauss(x)</samp></dt> |
| <dd><p>Compute Gauss function of <var class="var">x</var>, corresponding to |
| <code class="code">exp(-x*x/2) / sqrt(2*PI)</code>. |
| </p> |
| </dd> |
| <dt><samp class="option">gcd(x, y)</samp></dt> |
| <dd><p>Return the greatest common divisor of <var class="var">x</var> and <var class="var">y</var>. If both <var class="var">x</var> and |
| <var class="var">y</var> are 0 or either or both are less than zero then behavior is undefined. |
| </p> |
| </dd> |
| <dt><samp class="option">gt(x, y)</samp></dt> |
| <dd><p>Return 1 if <var class="var">x</var> is greater than <var class="var">y</var>, 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">gte(x, y)</samp></dt> |
| <dd><p>Return 1 if <var class="var">x</var> is greater than or equal to <var class="var">y</var>, 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">hypot(x, y)</samp></dt> |
| <dd><p>This function is similar to the C function with the same name; it returns |
| "sqrt(<var class="var">x</var>*<var class="var">x</var> + <var class="var">y</var>*<var class="var">y</var>)", the length of the hypotenuse of a |
| right triangle with sides of length <var class="var">x</var> and <var class="var">y</var>, or the distance of the |
| point (<var class="var">x</var>, <var class="var">y</var>) from the origin. |
| </p> |
| </dd> |
| <dt><samp class="option">if(x, y)</samp></dt> |
| <dd><p>Evaluate <var class="var">x</var>, and if the result is non-zero return the result of |
| the evaluation of <var class="var">y</var>, return 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">if(x, y, z)</samp></dt> |
| <dd><p>Evaluate <var class="var">x</var>, and if the result is non-zero return the evaluation |
| result of <var class="var">y</var>, otherwise the evaluation result of <var class="var">z</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">ifnot(x, y)</samp></dt> |
| <dd><p>Evaluate <var class="var">x</var>, and if the result is zero return the result of the |
| evaluation of <var class="var">y</var>, return 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">ifnot(x, y, z)</samp></dt> |
| <dd><p>Evaluate <var class="var">x</var>, and if the result is zero return the evaluation |
| result of <var class="var">y</var>, otherwise the evaluation result of <var class="var">z</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">isinf(x)</samp></dt> |
| <dd><p>Return 1.0 if <var class="var">x</var> is +/-INFINITY, 0.0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">isnan(x)</samp></dt> |
| <dd><p>Return 1.0 if <var class="var">x</var> is NAN, 0.0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">ld(idx)</samp></dt> |
| <dd><p>Load the value of the internal variable with index <var class="var">idx</var>, which was |
| previously stored with st(<var class="var">idx</var>, <var class="var">expr</var>). |
| The function returns the loaded value. |
| </p> |
| </dd> |
| <dt><samp class="option">lerp(x, y, z)</samp></dt> |
| <dd><p>Return linear interpolation between <var class="var">x</var> and <var class="var">y</var> by amount of <var class="var">z</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">log(x)</samp></dt> |
| <dd><p>Compute natural logarithm of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">lt(x, y)</samp></dt> |
| <dd><p>Return 1 if <var class="var">x</var> is lesser than <var class="var">y</var>, 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">lte(x, y)</samp></dt> |
| <dd><p>Return 1 if <var class="var">x</var> is lesser than or equal to <var class="var">y</var>, 0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">max(x, y)</samp></dt> |
| <dd><p>Return the maximum between <var class="var">x</var> and <var class="var">y</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">min(x, y)</samp></dt> |
| <dd><p>Return the minimum between <var class="var">x</var> and <var class="var">y</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">mod(x, y)</samp></dt> |
| <dd><p>Compute the remainder of division of <var class="var">x</var> by <var class="var">y</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">not(expr)</samp></dt> |
| <dd><p>Return 1.0 if <var class="var">expr</var> is zero, 0.0 otherwise. |
| </p> |
| </dd> |
| <dt><samp class="option">pow(x, y)</samp></dt> |
| <dd><p>Compute the power of <var class="var">x</var> elevated <var class="var">y</var>, it is equivalent to |
| "(<var class="var">x</var>)^(<var class="var">y</var>)". |
| </p> |
| </dd> |
| <dt><samp class="option">print(t)</samp></dt> |
| <dt><samp class="option">print(t, l)</samp></dt> |
| <dd><p>Print the value of expression <var class="var">t</var> with loglevel <var class="var">l</var>. If <var class="var">l</var> is not |
| specified then a default log level is used. |
| Return the value of the expression printed. |
| </p> |
| </dd> |
| <dt><samp class="option">random(idx)</samp></dt> |
| <dd><p>Return a pseudo random value between 0.0 and 1.0. <var class="var">idx</var> is the |
| index of the internal variable used to save the seed/state, which can be |
| previously stored with <code class="code">st(idx)</code>. |
| </p> |
| <p>To initialize the seed, you need to store the seed value as a 64-bit |
| unsigned integer in the internal variable with index <var class="var">idx</var>. |
| </p> |
| <p>For example, to store the seed with value <code class="code">42</code> in the internal |
| variable with index <code class="code">0</code> and print a few random values: |
| </p><div class="example"> |
| <pre class="example-preformatted">st(0,42); print(random(0)); print(random(0)); print(random(0)) |
| </pre></div> |
|
|
| </dd> |
| <dt><samp class="option">randomi(idx, min, max)</samp></dt> |
| <dd><p>Return a pseudo random value in the interval between <var class="var">min</var> and |
| <var class="var">max</var>. <var class="var">idx</var> is the index of the internal variable which will be used to |
| save the seed/state, which can be previously stored with <code class="code">st(idx)</code>. |
| </p> |
| <p>To initialize the seed, you need to store the seed value as a 64-bit |
| unsigned integer in the internal variable with index <var class="var">idx</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">root(expr, max)</samp></dt> |
| <dd><p>Find an input value for which the function represented by <var class="var">expr</var> |
| with argument <var class="var">ld(0)</var> is 0 in the interval 0..<var class="var">max</var>. |
| </p> |
| <p>The expression in <var class="var">expr</var> must denote a continuous function or the |
| result is undefined. |
| </p> |
| <p><var class="var">ld(0)</var> is used to represent the function input value, which means that the |
| given expression will be evaluated multiple times with various input values that |
| the expression can access through <code class="code">ld(0)</code>. When the expression evaluates to |
| 0 then the corresponding input value will be returned. |
| </p> |
| </dd> |
| <dt><samp class="option">round(expr)</samp></dt> |
| <dd><p>Round the value of expression <var class="var">expr</var> to the nearest integer. For example, |
| "round(1.5)" is "2.0". |
| </p> |
| </dd> |
| <dt><samp class="option">sgn(x)</samp></dt> |
| <dd><p>Compute sign of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">sin(x)</samp></dt> |
| <dd><p>Compute sine of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">sinh(x)</samp></dt> |
| <dd><p>Compute hyperbolic sine of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">sqrt(expr)</samp></dt> |
| <dd><p>Compute the square root of <var class="var">expr</var>. This is equivalent to |
| "(<var class="var">expr</var>)^.5". |
| </p> |
| </dd> |
| <dt><samp class="option">squish(x)</samp></dt> |
| <dd><p>Compute expression <code class="code">1/(1 + exp(4*x))</code>. |
| </p> |
| </dd> |
| <dt><samp class="option">st(idx, expr)</samp></dt> |
| <dd><p>Store the value of the expression <var class="var">expr</var> in an internal |
| variable. <var class="var">idx</var> specifies the index of the variable where to store |
| the value, and it is a value ranging from 0 to 9. The function returns |
| the value stored in the internal variable. |
| </p> |
| <p>The stored value can be retrieved with <code class="code">ld(var)</code>. |
| </p> |
| <p>Note: variables are currently not shared between expressions. |
| </p> |
| </dd> |
| <dt><samp class="option">tan(x)</samp></dt> |
| <dd><p>Compute tangent of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">tanh(x)</samp></dt> |
| <dd><p>Compute hyperbolic tangent of <var class="var">x</var>. |
| </p> |
| </dd> |
| <dt><samp class="option">taylor(expr, x)</samp></dt> |
| <dt><samp class="option">taylor(expr, x, idx)</samp></dt> |
| <dd><p>Evaluate a Taylor series at <var class="var">x</var>, given an expression representing |
| the <code class="code">ld(idx)</code>-th derivative of a function at 0. |
| </p> |
| <p>When the series does not converge the result is undefined. |
| </p> |
| <p><var class="var">ld(idx)</var> is used to represent the derivative order in <var class="var">expr</var>, |
| which means that the given expression will be evaluated multiple times |
| with various input values that the expression can access through |
| <code class="code">ld(idx)</code>. If <var class="var">idx</var> is not specified then 0 is assumed. |
| </p> |
| <p>Note, when you have the derivatives at y instead of 0, |
| <code class="code">taylor(expr, x-y)</code> can be used. |
| </p> |
| </dd> |
| <dt><samp class="option">time(0)</samp></dt> |
| <dd><p>Return the current (wallclock) time in seconds. |
| </p> |
| </dd> |
| <dt><samp class="option">trunc(expr)</samp></dt> |
| <dd><p>Round the value of expression <var class="var">expr</var> towards zero to the nearest |
| integer. For example, "trunc(-1.5)" is "-1.0". |
| </p> |
| </dd> |
| <dt><samp class="option">while(cond, expr)</samp></dt> |
| <dd><p>Evaluate expression <var class="var">expr</var> while the expression <var class="var">cond</var> is |
| non-zero, and returns the value of the last <var class="var">expr</var> evaluation, or |
| NAN if <var class="var">cond</var> was always false. |
| </p></dd> |
| </dl> |
|
|
| <p>The following constants are available: |
| </p><dl class="table"> |
| <dt><samp class="option">PI</samp></dt> |
| <dd><p>area of the unit disc, approximately 3.14 |
| </p></dd> |
| <dt><samp class="option">E</samp></dt> |
| <dd><p>exp(1) (Euler’s number), approximately 2.718 |
| </p></dd> |
| <dt><samp class="option">PHI</samp></dt> |
| <dd><p>golden ratio (1+sqrt(5))/2, approximately 1.618 |
| </p></dd> |
| </dl> |
|
|
| <p>Assuming that an expression is considered "true" if it has a non-zero |
| value, note that: |
| </p> |
| <p><code class="code">*</code> works like AND |
| </p> |
| <p><code class="code">+</code> works like OR |
| </p> |
| <p>For example the construct: |
| </p><div class="example"> |
| <pre class="example-preformatted">if (A AND B) then C |
| </pre></div> |
| <p>is equivalent to: |
| </p><div class="example"> |
| <pre class="example-preformatted">if(A*B, C) |
| </pre></div> |
|
|
| <p>In your C code, you can extend the list of unary and binary functions, |
| and define recognized constants, so that they are available for your |
| expressions. |
| </p> |
| <p>The evaluator also recognizes the International System unit prefixes. |
| If ’i’ is appended after the prefix, binary prefixes are used, which |
| are based on powers of 1024 instead of powers of 1000. |
| The ’B’ postfix multiplies the value by 8, and can be appended after a |
| unit prefix or used alone. This allows using for example ’KB’, ’MiB’, |
| ’G’ and ’B’ as number postfix. |
| </p> |
| <p>The list of available International System prefixes follows, with |
| indication of the corresponding powers of 10 and of 2. |
| </p><dl class="table"> |
| <dt><samp class="option">y</samp></dt> |
| <dd><p>10^-24 / 2^-80 |
| </p></dd> |
| <dt><samp class="option">z</samp></dt> |
| <dd><p>10^-21 / 2^-70 |
| </p></dd> |
| <dt><samp class="option">a</samp></dt> |
| <dd><p>10^-18 / 2^-60 |
| </p></dd> |
| <dt><samp class="option">f</samp></dt> |
| <dd><p>10^-15 / 2^-50 |
| </p></dd> |
| <dt><samp class="option">p</samp></dt> |
| <dd><p>10^-12 / 2^-40 |
| </p></dd> |
| <dt><samp class="option">n</samp></dt> |
| <dd><p>10^-9 / 2^-30 |
| </p></dd> |
| <dt><samp class="option">u</samp></dt> |
| <dd><p>10^-6 / 2^-20 |
| </p></dd> |
| <dt><samp class="option">m</samp></dt> |
| <dd><p>10^-3 / 2^-10 |
| </p></dd> |
| <dt><samp class="option">c</samp></dt> |
| <dd><p>10^-2 |
| </p></dd> |
| <dt><samp class="option">d</samp></dt> |
| <dd><p>10^-1 |
| </p></dd> |
| <dt><samp class="option">h</samp></dt> |
| <dd><p>10^2 |
| </p></dd> |
| <dt><samp class="option">k</samp></dt> |
| <dd><p>10^3 / 2^10 |
| </p></dd> |
| <dt><samp class="option">K</samp></dt> |
| <dd><p>10^3 / 2^10 |
| </p></dd> |
| <dt><samp class="option">M</samp></dt> |
| <dd><p>10^6 / 2^20 |
| </p></dd> |
| <dt><samp class="option">G</samp></dt> |
| <dd><p>10^9 / 2^30 |
| </p></dd> |
| <dt><samp class="option">T</samp></dt> |
| <dd><p>10^12 / 2^40 |
| </p></dd> |
| <dt><samp class="option">P</samp></dt> |
| <dd><p>10^15 / 2^50 |
| </p></dd> |
| <dt><samp class="option">E</samp></dt> |
| <dd><p>10^18 / 2^60 |
| </p></dd> |
| <dt><samp class="option">Z</samp></dt> |
| <dd><p>10^21 / 2^70 |
| </p></dd> |
| <dt><samp class="option">Y</samp></dt> |
| <dd><p>10^24 / 2^80 |
| </p></dd> |
| </dl> |
|
|
|
|
| <a name="See-Also"></a> |
| <h2 class="chapter">4 See Also<span class="pull-right"><a class="anchor hidden-xs" href="#See-Also" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-See-Also" aria-hidden="true">TOC</a></span></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>, |
| <a class="url" href="libavutil.html">libavutil</a> |
| </p> |
|
|
| <a name="Authors"></a> |
| <h2 class="chapter">5 Authors<span class="pull-right"><a class="anchor hidden-xs" href="#Authors" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Authors" aria-hidden="true">TOC</a></span></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> |
|
|
| <p style="font-size: small;"> |
| This document was generated using <a class="uref" href="https://www.gnu.org/software/texinfo/"><em class="emph">makeinfo</em></a>. |
| </p> |
| </div> |
| </body> |
| </html> |
|
|
