2235 lines
92 KiB
HTML
2235 lines
92 KiB
HTML
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FFmpeg Devices Documentation
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<meta name="viewport" content="width=device-width,initial-scale=1.0">
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<link rel="stylesheet" type="text/css" href="style.min.css">
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<div class="container">
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<h1>
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FFmpeg Devices Documentation
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</h1>
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<div align="center">
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</div>
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<a name="SEC_Top"></a>
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<a name="SEC_Contents"></a>
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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="no-bullet">
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<li><a name="toc-Description" href="#Description">1 Description</a></li>
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<li><a name="toc-Device-Options" href="#Device-Options">2 Device Options</a></li>
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<li><a name="toc-Input-Devices" href="#Input-Devices">3 Input Devices</a>
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<ul class="no-bullet">
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<li><a name="toc-alsa" href="#alsa">3.1 alsa</a>
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<ul class="no-bullet">
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<li><a name="toc-Options" href="#Options">3.1.1 Options</a></li>
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</ul></li>
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<li><a name="toc-avfoundation" href="#avfoundation">3.2 avfoundation</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-1" href="#Options-1">3.2.1 Options</a></li>
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<li><a name="toc-Examples" href="#Examples">3.2.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-bktr" href="#bktr">3.3 bktr</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-2" href="#Options-2">3.3.1 Options</a></li>
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</ul></li>
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<li><a name="toc-decklink" href="#decklink">3.4 decklink</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-3" href="#Options-3">3.4.1 Options</a></li>
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<li><a name="toc-Examples-1" href="#Examples-1">3.4.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-dshow" href="#dshow">3.5 dshow</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-4" href="#Options-4">3.5.1 Options</a></li>
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<li><a name="toc-Examples-2" href="#Examples-2">3.5.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-dv1394" href="#dv1394">3.6 dv1394</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-5" href="#Options-5">3.6.1 Options</a></li>
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</ul></li>
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<li><a name="toc-fbdev" href="#fbdev">3.7 fbdev</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-6" href="#Options-6">3.7.1 Options</a></li>
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</ul></li>
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<li><a name="toc-gdigrab" href="#gdigrab">3.8 gdigrab</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-7" href="#Options-7">3.8.1 Options</a></li>
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</ul></li>
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<li><a name="toc-iec61883" href="#iec61883">3.9 iec61883</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-8" href="#Options-8">3.9.1 Options</a></li>
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<li><a name="toc-Examples-3" href="#Examples-3">3.9.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-jack" href="#jack">3.10 jack</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-9" href="#Options-9">3.10.1 Options</a></li>
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</ul></li>
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<li><a name="toc-lavfi" href="#lavfi">3.11 lavfi</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-10" href="#Options-10">3.11.1 Options</a></li>
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<li><a name="toc-Examples-4" href="#Examples-4">3.11.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-libcdio" href="#libcdio">3.12 libcdio</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-11" href="#Options-11">3.12.1 Options</a></li>
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</ul></li>
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<li><a name="toc-libdc1394" href="#libdc1394">3.13 libdc1394</a></li>
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<li><a name="toc-openal" href="#openal">3.14 openal</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-12" href="#Options-12">3.14.1 Options</a></li>
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<li><a name="toc-Examples-5" href="#Examples-5">3.14.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-oss" href="#oss">3.15 oss</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-13" href="#Options-13">3.15.1 Options</a></li>
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</ul></li>
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<li><a name="toc-pulse" href="#pulse">3.16 pulse</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-14" href="#Options-14">3.16.1 Options</a></li>
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<li><a name="toc-Examples-6" href="#Examples-6">3.16.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-qtkit" href="#qtkit">3.17 qtkit</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-15" href="#Options-15">3.17.1 Options</a></li>
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</ul></li>
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<li><a name="toc-sndio" href="#sndio">3.18 sndio</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-16" href="#Options-16">3.18.1 Options</a></li>
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</ul></li>
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<li><a name="toc-video4linux2_002c-v4l2" href="#video4linux2_002c-v4l2">3.19 video4linux2, v4l2</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-17" href="#Options-17">3.19.1 Options</a></li>
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</ul></li>
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<li><a name="toc-vfwcap" href="#vfwcap">3.20 vfwcap</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-18" href="#Options-18">3.20.1 Options</a></li>
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</ul></li>
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<li><a name="toc-x11grab" href="#x11grab">3.21 x11grab</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-19" href="#Options-19">3.21.1 Options</a></li>
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</ul></li>
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</ul></li>
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<li><a name="toc-Output-Devices" href="#Output-Devices">4 Output Devices</a>
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<ul class="no-bullet">
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<li><a name="toc-alsa-1" href="#alsa-1">4.1 alsa</a>
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<ul class="no-bullet">
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<li><a name="toc-Examples-7" href="#Examples-7">4.1.1 Examples</a></li>
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</ul></li>
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<li><a name="toc-caca" href="#caca">4.2 caca</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-20" href="#Options-20">4.2.1 Options</a></li>
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<li><a name="toc-Examples-8" href="#Examples-8">4.2.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-decklink-1" href="#decklink-1">4.3 decklink</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-21" href="#Options-21">4.3.1 Options</a></li>
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<li><a name="toc-Examples-9" href="#Examples-9">4.3.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-fbdev-1" href="#fbdev-1">4.4 fbdev</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-22" href="#Options-22">4.4.1 Options</a></li>
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<li><a name="toc-Examples-10" href="#Examples-10">4.4.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-opengl" href="#opengl">4.5 opengl</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-23" href="#Options-23">4.5.1 Options</a></li>
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<li><a name="toc-Examples-11" href="#Examples-11">4.5.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-oss-1" href="#oss-1">4.6 oss</a></li>
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<li><a name="toc-pulse-1" href="#pulse-1">4.7 pulse</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-24" href="#Options-24">4.7.1 Options</a></li>
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<li><a name="toc-Examples-12" href="#Examples-12">4.7.2 Examples</a></li>
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</ul></li>
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<li><a name="toc-sdl" href="#sdl">4.8 sdl</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-25" href="#Options-25">4.8.1 Options</a></li>
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<li><a name="toc-Interactive-commands" href="#Interactive-commands">4.8.2 Interactive commands</a></li>
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<li><a name="toc-Examples-13" href="#Examples-13">4.8.3 Examples</a></li>
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</ul></li>
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<li><a name="toc-sndio-1" href="#sndio-1">4.9 sndio</a></li>
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<li><a name="toc-xv" href="#xv">4.10 xv</a>
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<ul class="no-bullet">
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<li><a name="toc-Options-26" href="#Options-26">4.10.1 Options</a></li>
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<li><a name="toc-Examples-14" href="#Examples-14">4.10.2 Examples</a></li>
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</ul></li>
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</ul></li>
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<li><a name="toc-See-Also" href="#See-Also">5 See Also</a></li>
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<li><a name="toc-Authors" href="#Authors">6 Authors</a></li>
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</ul>
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</div>
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<a name="Description"></a>
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<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>
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<p>This document describes the input and output devices provided by the
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libavdevice library.
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</p>
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<a name="Device-Options"></a>
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<h2 class="chapter">2 Device Options<span class="pull-right"><a class="anchor hidden-xs" href="#Device-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Device-Options" aria-hidden="true">TOC</a></span></h2>
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<p>The libavdevice library provides the same interface as
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libavformat. Namely, an input device is considered like a demuxer, and
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an output device like a muxer, and the interface and generic device
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options are the same provided by libavformat (see the ffmpeg-formats
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manual).
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</p>
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<p>In addition each input or output device may support so-called private
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options, which are specific for that component.
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</p>
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<p>Options may be set by specifying -<var>option</var> <var>value</var> in the
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FFmpeg tools, or by setting the value explicitly in the device
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<code>AVFormatContext</code> options or using the <samp>libavutil/opt.h</samp> API
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for programmatic use.
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</p>
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<a name="Input-Devices"></a>
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<h2 class="chapter">3 Input Devices<span class="pull-right"><a class="anchor hidden-xs" href="#Input-Devices" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Input-Devices" aria-hidden="true">TOC</a></span></h2>
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<p>Input devices are configured elements in FFmpeg which enable accessing
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the data coming from a multimedia device attached to your system.
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</p>
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<p>When you configure your FFmpeg build, all the supported input devices
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are enabled by default. You can list all available ones using the
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configure option "–list-indevs".
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</p>
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<p>You can disable all the input devices using the configure option
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"–disable-indevs", and selectively enable an input device using the
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option "–enable-indev=<var>INDEV</var>", or you can disable a particular
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input device using the option "–disable-indev=<var>INDEV</var>".
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</p>
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<p>The option "-devices" of the ff* tools will display the list of
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supported input devices.
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</p>
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<p>A description of the currently available input devices follows.
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</p>
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<a name="alsa"></a>
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<h3 class="section">3.1 alsa<span class="pull-right"><a class="anchor hidden-xs" href="#alsa" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alsa" aria-hidden="true">TOC</a></span></h3>
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<p>ALSA (Advanced Linux Sound Architecture) input device.
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</p>
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<p>To enable this input device during configuration you need libasound
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installed on your system.
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</p>
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<p>This device allows capturing from an ALSA device. The name of the
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device to capture has to be an ALSA card identifier.
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</p>
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<p>An ALSA identifier has the syntax:
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</p><div class="example">
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<pre class="example">hw:<var>CARD</var>[,<var>DEV</var>[,<var>SUBDEV</var>]]
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</pre></div>
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<p>where the <var>DEV</var> and <var>SUBDEV</var> components are optional.
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</p>
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<p>The three arguments (in order: <var>CARD</var>,<var>DEV</var>,<var>SUBDEV</var>)
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specify card number or identifier, device number and subdevice number
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(-1 means any).
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</p>
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<p>To see the list of cards currently recognized by your system check the
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files <samp>/proc/asound/cards</samp> and <samp>/proc/asound/devices</samp>.
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</p>
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<p>For example to capture with <code>ffmpeg</code> from an ALSA device with
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card id 0, you may run the command:
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</p><div class="example">
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<pre class="example">ffmpeg -f alsa -i hw:0 alsaout.wav
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</pre></div>
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<p>For more information see:
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<a href="http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html">http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html</a>
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</p>
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<a name="Options"></a>
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<h4 class="subsection">3.1.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options" aria-hidden="true">TOC</a></span></h4>
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<dl compact="compact">
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<dt><samp>sample_rate</samp></dt>
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<dd><p>Set the sample rate in Hz. Default is 48000.
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</p>
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</dd>
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<dt><samp>channels</samp></dt>
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<dd><p>Set the number of channels. Default is 2.
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</p>
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</dd>
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</dl>
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<a name="avfoundation"></a>
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<h3 class="section">3.2 avfoundation<span class="pull-right"><a class="anchor hidden-xs" href="#avfoundation" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-avfoundation" aria-hidden="true">TOC</a></span></h3>
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<p>AVFoundation input device.
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</p>
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<p>AVFoundation is the currently recommended framework by Apple for streamgrabbing on OSX >= 10.7 as well as on iOS.
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The older QTKit framework has been marked deprecated since OSX version 10.7.
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</p>
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<p>The input filename has to be given in the following syntax:
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</p><div class="example">
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<pre class="example">-i "[[VIDEO]:[AUDIO]]"
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</pre></div>
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<p>The first entry selects the video input while the latter selects the audio input.
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The stream has to be specified by the device name or the device index as shown by the device list.
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Alternatively, the video and/or audio input device can be chosen by index using the
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<samp>
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-video_device_index <INDEX>
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</samp>
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and/or
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<samp>
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-audio_device_index <INDEX>
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</samp>
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, overriding any
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device name or index given in the input filename.
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</p>
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<p>All available devices can be enumerated by using <samp>-list_devices true</samp>, listing
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all device names and corresponding indices.
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</p>
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<p>There are two device name aliases:
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</p><dl compact="compact">
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<dt><code>default</code></dt>
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<dd><p>Select the AVFoundation default device of the corresponding type.
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</p>
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</dd>
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<dt><code>none</code></dt>
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<dd><p>Do not record the corresponding media type.
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This is equivalent to specifying an empty device name or index.
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</p>
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</dd>
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</dl>
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<a name="Options-1"></a>
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<h4 class="subsection">3.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-1" aria-hidden="true">TOC</a></span></h4>
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<p>AVFoundation supports the following options:
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</p>
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<dl compact="compact">
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<dt><samp>-list_devices <TRUE|FALSE></samp></dt>
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<dd><p>If set to true, a list of all available input devices is given showing all
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device names and indices.
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</p>
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</dd>
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<dt><samp>-video_device_index <INDEX></samp></dt>
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<dd><p>Specify the video device by its index. Overrides anything given in the input filename.
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</p>
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</dd>
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<dt><samp>-audio_device_index <INDEX></samp></dt>
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<dd><p>Specify the audio device by its index. Overrides anything given in the input filename.
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</p>
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</dd>
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<dt><samp>-pixel_format <FORMAT></samp></dt>
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<dd><p>Request the video device to use a specific pixel format.
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If the specified format is not supported, a list of available formats is given
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and the first one in this list is used instead. Available pixel formats are:
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<code>monob, rgb555be, rgb555le, rgb565be, rgb565le, rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0,
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bgr48be, uyvy422, yuva444p, yuva444p16le, yuv444p, yuv422p16, yuv422p10, yuv444p10,
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yuv420p, nv12, yuyv422, gray</code>
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</p>
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</dd>
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<dt><samp>-framerate</samp></dt>
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<dd><p>Set the grabbing frame rate. Default is <code>ntsc</code>, corresponding to a
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frame rate of <code>30000/1001</code>.
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</p>
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</dd>
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<dt><samp>-video_size</samp></dt>
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<dd><p>Set the video frame size.
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</p>
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</dd>
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<dt><samp>-capture_cursor</samp></dt>
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<dd><p>Capture the mouse pointer. Default is 0.
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</p>
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</dd>
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<dt><samp>-capture_mouse_clicks</samp></dt>
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<dd><p>Capture the screen mouse clicks. Default is 0.
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</p>
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</dd>
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</dl>
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<a name="Examples"></a>
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<h4 class="subsection">3.2.2 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>
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<ul>
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<li> Print the list of AVFoundation supported devices and exit:
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<div class="example">
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<pre class="example">$ ffmpeg -f avfoundation -list_devices true -i ""
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</pre></div>
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|
|
</li><li> Record video from video device 0 and audio from audio device 0 into out.avi:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f avfoundation -i "0:0" out.avi
|
|
</pre></div>
|
|
|
|
</li><li> Record video from video device 2 and audio from audio device 1 into out.avi:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f avfoundation -video_device_index 2 -i ":1" out.avi
|
|
</pre></div>
|
|
|
|
</li><li> Record video from the system default video device using the pixel format bgr0 and do not record any audio into out.avi:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f avfoundation -pixel_format bgr0 -i "default:none" out.avi
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
<a name="bktr"></a>
|
|
<h3 class="section">3.3 bktr<span class="pull-right"><a class="anchor hidden-xs" href="#bktr" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-bktr" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>BSD video input device.
|
|
</p>
|
|
<a name="Options-2"></a>
|
|
<h4 class="subsection">3.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-2" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the frame rate.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_size</samp></dt>
|
|
<dd><p>Set the video frame size. Default is <code>vga</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>standard</samp></dt>
|
|
<dd>
|
|
<p>Available values are:
|
|
</p><dl compact="compact">
|
|
<dt>‘<samp>pal</samp>’</dt>
|
|
<dt>‘<samp>ntsc</samp>’</dt>
|
|
<dt>‘<samp>secam</samp>’</dt>
|
|
<dt>‘<samp>paln</samp>’</dt>
|
|
<dt>‘<samp>palm</samp>’</dt>
|
|
<dt>‘<samp>ntscj</samp>’</dt>
|
|
</dl>
|
|
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="decklink"></a>
|
|
<h3 class="section">3.4 decklink<span class="pull-right"><a class="anchor hidden-xs" href="#decklink" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-decklink" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>The decklink input device provides capture capabilities for Blackmagic
|
|
DeckLink devices.
|
|
</p>
|
|
<p>To enable this input device, you need the Blackmagic DeckLink SDK and you
|
|
need to configure with the appropriate <code>--extra-cflags</code>
|
|
and <code>--extra-ldflags</code>.
|
|
On Windows, you need to run the IDL files through <code>widl</code>.
|
|
</p>
|
|
<p>DeckLink is very picky about the formats it supports. Pixel format is
|
|
uyvy422 or v210, framerate and video size must be determined for your device with
|
|
<code>-list_formats 1</code>. Audio sample rate is always 48 kHz and the number
|
|
of channels can be 2, 8 or 16. Note that all audio channels are bundled in one single
|
|
audio track.
|
|
</p>
|
|
<a name="Options-3"></a>
|
|
<h4 class="subsection">3.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-3" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>list_devices</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of devices and exit.
|
|
Defaults to <samp>false</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_formats</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of supported formats and exit.
|
|
Defaults to <samp>false</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>bm_v210</samp></dt>
|
|
<dd><p>If set to ‘<samp>1</samp>’, video is captured in 10 bit v210 instead
|
|
of uyvy422. Not all Blackmagic devices support this option.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>teletext_lines</samp></dt>
|
|
<dd><p>If set to nonzero, an additional teletext stream will be captured from the
|
|
vertical ancillary data. This option is a bitmask of the VBI lines checked,
|
|
specifically lines 6 to 22, and lines 318 to 335. Line 6 is the LSB in the mask.
|
|
Selected lines which do not contain teletext information will be ignored. You
|
|
can use the special <samp>all</samp> constant to select all possible lines, or
|
|
<samp>standard</samp> to skip lines 6, 318 and 319, which are not compatible with all
|
|
receivers. Capturing teletext only works for SD PAL sources in 8 bit mode.
|
|
To use this option, ffmpeg needs to be compiled with <code>--enable-libzvbi</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Defines number of audio channels to capture. Must be ‘<samp>2</samp>’, ‘<samp>8</samp>’ or ‘<samp>16</samp>’.
|
|
Defaults to ‘<samp>2</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>duplex_mode</samp></dt>
|
|
<dd><p>Sets the decklink device duplex mode. Must be ‘<samp>unset</samp>’, ‘<samp>half</samp>’ or ‘<samp>full</samp>’.
|
|
Defaults to ‘<samp>unset</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_input</samp></dt>
|
|
<dd><p>Sets the video input source. Must be ‘<samp>unset</samp>’, ‘<samp>sdi</samp>’, ‘<samp>hdmi</samp>’,
|
|
‘<samp>optical_sdi</samp>’, ‘<samp>component</samp>’, ‘<samp>composite</samp>’ or ‘<samp>s_video</samp>’.
|
|
Defaults to ‘<samp>unset</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_input</samp></dt>
|
|
<dd><p>Sets the audio input source. Must be ‘<samp>unset</samp>’, ‘<samp>embedded</samp>’,
|
|
‘<samp>aes_ebu</samp>’, ‘<samp>analog</samp>’, ‘<samp>analog_xlr</samp>’, ‘<samp>analog_rca</samp>’ or
|
|
‘<samp>microphone</samp>’. Defaults to ‘<samp>unset</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_pts</samp></dt>
|
|
<dd><p>Sets the video packet timestamp source. Must be ‘<samp>video</samp>’, ‘<samp>audio</samp>’,
|
|
‘<samp>reference</samp>’ or ‘<samp>wallclock</samp>’. Defaults to ‘<samp>video</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_pts</samp></dt>
|
|
<dd><p>Sets the audio packet timestamp source. Must be ‘<samp>video</samp>’, ‘<samp>audio</samp>’,
|
|
‘<samp>reference</samp>’ or ‘<samp>wallclock</samp>’. Defaults to ‘<samp>audio</samp>’.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-1"></a>
|
|
<h4 class="subsection">3.4.2 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>
|
|
|
|
<ul>
|
|
<li> List input devices:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f decklink -list_devices 1 -i dummy
|
|
</pre></div>
|
|
|
|
</li><li> List supported formats:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
|
|
</pre></div>
|
|
|
|
</li><li> Capture video clip at 1080i50 (format 11):
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f decklink -i 'Intensity Pro@11' -acodec copy -vcodec copy output.avi
|
|
</pre></div>
|
|
|
|
</li><li> Capture video clip at 1080i50 10 bit:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -bm_v210 1 -f decklink -i 'UltraStudio Mini Recorder@11' -acodec copy -vcodec copy output.avi
|
|
</pre></div>
|
|
|
|
</li><li> Capture video clip at 1080i50 with 16 audio channels:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -channels 16 -f decklink -i 'UltraStudio Mini Recorder@11' -acodec copy -vcodec copy output.avi
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
<a name="dshow"></a>
|
|
<h3 class="section">3.5 dshow<span class="pull-right"><a class="anchor hidden-xs" href="#dshow" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dshow" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Windows DirectShow input device.
|
|
</p>
|
|
<p>DirectShow support is enabled when FFmpeg is built with the mingw-w64 project.
|
|
Currently only audio and video devices are supported.
|
|
</p>
|
|
<p>Multiple devices may be opened as separate inputs, but they may also be
|
|
opened on the same input, which should improve synchronism between them.
|
|
</p>
|
|
<p>The input name should be in the format:
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example"><var>TYPE</var>=<var>NAME</var>[:<var>TYPE</var>=<var>NAME</var>]
|
|
</pre></div>
|
|
|
|
<p>where <var>TYPE</var> can be either <var>audio</var> or <var>video</var>,
|
|
and <var>NAME</var> is the device’s name or alternative name..
|
|
</p>
|
|
<a name="Options-4"></a>
|
|
<h4 class="subsection">3.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-4" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<p>If no options are specified, the device’s defaults are used.
|
|
If the device does not support the requested options, it will
|
|
fail to open.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><samp>video_size</samp></dt>
|
|
<dd><p>Set the video size in the captured video.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the frame rate in the captured video.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>sample_rate</samp></dt>
|
|
<dd><p>Set the sample rate (in Hz) of the captured audio.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>sample_size</samp></dt>
|
|
<dd><p>Set the sample size (in bits) of the captured audio.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Set the number of channels in the captured audio.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_devices</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of devices and exit.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_options</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of selected device’s options
|
|
and exit.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_device_number</samp></dt>
|
|
<dd><p>Set video device number for devices with the same name (starts at 0,
|
|
defaults to 0).
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_device_number</samp></dt>
|
|
<dd><p>Set audio device number for devices with the same name (starts at 0,
|
|
defaults to 0).
|
|
</p>
|
|
</dd>
|
|
<dt><samp>pixel_format</samp></dt>
|
|
<dd><p>Select pixel format to be used by DirectShow. This may only be set when
|
|
the video codec is not set or set to rawvideo.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_buffer_size</samp></dt>
|
|
<dd><p>Set audio device buffer size in milliseconds (which can directly
|
|
impact latency, depending on the device).
|
|
Defaults to using the audio device’s
|
|
default buffer size (typically some multiple of 500ms).
|
|
Setting this value too low can degrade performance.
|
|
See also
|
|
<a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx">http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx</a>
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_pin_name</samp></dt>
|
|
<dd><p>Select video capture pin to use by name or alternative name.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_pin_name</samp></dt>
|
|
<dd><p>Select audio capture pin to use by name or alternative name.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>crossbar_video_input_pin_number</samp></dt>
|
|
<dd><p>Select video input pin number for crossbar device. This will be
|
|
routed to the crossbar device’s Video Decoder output pin.
|
|
Note that changing this value can affect future invocations
|
|
(sets a new default) until system reboot occurs.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>crossbar_audio_input_pin_number</samp></dt>
|
|
<dd><p>Select audio input pin number for crossbar device. This will be
|
|
routed to the crossbar device’s Audio Decoder output pin.
|
|
Note that changing this value can affect future invocations
|
|
(sets a new default) until system reboot occurs.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_video_device_dialog</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, before capture starts, popup a display dialog
|
|
to the end user, allowing them to change video filter properties
|
|
and configurations manually.
|
|
Note that for crossbar devices, adjusting values in this dialog
|
|
may be needed at times to toggle between PAL (25 fps) and NTSC (29.97)
|
|
input frame rates, sizes, interlacing, etc. Changing these values can
|
|
enable different scan rates/frame rates and avoiding green bars at
|
|
the bottom, flickering scan lines, etc.
|
|
Note that with some devices, changing these properties can also affect future
|
|
invocations (sets new defaults) until system reboot occurs.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_audio_device_dialog</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, before capture starts, popup a display dialog
|
|
to the end user, allowing them to change audio filter properties
|
|
and configurations manually.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_video_crossbar_connection_dialog</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, before capture starts, popup a display
|
|
dialog to the end user, allowing them to manually
|
|
modify crossbar pin routings, when it opens a video device.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_audio_crossbar_connection_dialog</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, before capture starts, popup a display
|
|
dialog to the end user, allowing them to manually
|
|
modify crossbar pin routings, when it opens an audio device.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_analog_tv_tuner_dialog</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, before capture starts, popup a display
|
|
dialog to the end user, allowing them to manually
|
|
modify TV channels and frequencies.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_analog_tv_tuner_audio_dialog</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, before capture starts, popup a display
|
|
dialog to the end user, allowing them to manually
|
|
modify TV audio (like mono vs. stereo, Language A,B or C).
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_device_load</samp></dt>
|
|
<dd><p>Load an audio capture filter device from file instead of searching
|
|
it by name. It may load additional parameters too, if the filter
|
|
supports the serialization of its properties to.
|
|
To use this an audio capture source has to be specified, but it can
|
|
be anything even fake one.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>audio_device_save</samp></dt>
|
|
<dd><p>Save the currently used audio capture filter device and its
|
|
parameters (if the filter supports it) to a file.
|
|
If a file with the same name exists it will be overwritten.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_device_load</samp></dt>
|
|
<dd><p>Load a video capture filter device from file instead of searching
|
|
it by name. It may load additional parameters too, if the filter
|
|
supports the serialization of its properties to.
|
|
To use this a video capture source has to be specified, but it can
|
|
be anything even fake one.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_device_save</samp></dt>
|
|
<dd><p>Save the currently used video capture filter device and its
|
|
parameters (if the filter supports it) to a file.
|
|
If a file with the same name exists it will be overwritten.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-2"></a>
|
|
<h4 class="subsection">3.5.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-2" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> Print the list of DirectShow supported devices and exit:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -list_devices true -f dshow -i dummy
|
|
</pre></div>
|
|
|
|
</li><li> Open video device <var>Camera</var>:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f dshow -i video="Camera"
|
|
</pre></div>
|
|
|
|
</li><li> Open second video device with name <var>Camera</var>:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
|
|
</pre></div>
|
|
|
|
</li><li> Open video device <var>Camera</var> and audio device <var>Microphone</var>:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f dshow -i video="Camera":audio="Microphone"
|
|
</pre></div>
|
|
|
|
</li><li> Print the list of supported options in selected device and exit:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -list_options true -f dshow -i video="Camera"
|
|
</pre></div>
|
|
|
|
</li><li> Specify pin names to capture by name or alternative name, specify alternative device name:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f dshow -audio_pin_name "Audio Out" -video_pin_name 2 -i video=video="@device_pnp_\\?\pci#ven_1a0a&dev_6200&subsys_62021461&rev_01#4&e2c7dd6&0&00e1#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}":audio="Microphone"
|
|
</pre></div>
|
|
|
|
</li><li> Configure a crossbar device, specifying crossbar pins, allow user to adjust video capture properties at startup:
|
|
<div class="example">
|
|
<pre class="example">$ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_number 0
|
|
-crossbar_audio_input_pin_number 3 -i video="AVerMedia BDA Analog Capture":audio="AVerMedia BDA Analog Capture"
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
<a name="dv1394"></a>
|
|
<h3 class="section">3.6 dv1394<span class="pull-right"><a class="anchor hidden-xs" href="#dv1394" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-dv1394" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Linux DV 1394 input device.
|
|
</p>
|
|
<a name="Options-5"></a>
|
|
<h4 class="subsection">3.6.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-5" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the frame rate. Default is 25.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>standard</samp></dt>
|
|
<dd>
|
|
<p>Available values are:
|
|
</p><dl compact="compact">
|
|
<dt>‘<samp>pal</samp>’</dt>
|
|
<dt>‘<samp>ntsc</samp>’</dt>
|
|
</dl>
|
|
|
|
<p>Default value is <code>ntsc</code>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="fbdev"></a>
|
|
<h3 class="section">3.7 fbdev<span class="pull-right"><a class="anchor hidden-xs" href="#fbdev" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fbdev" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Linux framebuffer input device.
|
|
</p>
|
|
<p>The Linux framebuffer is a graphic hardware-independent abstraction
|
|
layer to show graphics on a computer monitor, typically on the
|
|
console. It is accessed through a file device node, usually
|
|
<samp>/dev/fb0</samp>.
|
|
</p>
|
|
<p>For more detailed information read the file
|
|
Documentation/fb/framebuffer.txt included in the Linux source tree.
|
|
</p>
|
|
<p>See also <a href="http://linux-fbdev.sourceforge.net/">http://linux-fbdev.sourceforge.net/</a>, and fbset(1).
|
|
</p>
|
|
<p>To record from the framebuffer device <samp>/dev/fb0</samp> with
|
|
<code>ffmpeg</code>:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f fbdev -framerate 10 -i /dev/fb0 out.avi
|
|
</pre></div>
|
|
|
|
<p>You can take a single screenshot image with the command:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f fbdev -framerate 1 -i /dev/fb0 -frames:v 1 screenshot.jpeg
|
|
</pre></div>
|
|
|
|
<a name="Options-6"></a>
|
|
<h4 class="subsection">3.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-6" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-6" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the frame rate. Default is 25.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="gdigrab"></a>
|
|
<h3 class="section">3.8 gdigrab<span class="pull-right"><a class="anchor hidden-xs" href="#gdigrab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-gdigrab" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Win32 GDI-based screen capture device.
|
|
</p>
|
|
<p>This device allows you to capture a region of the display on Windows.
|
|
</p>
|
|
<p>There are two options for the input filename:
|
|
</p><div class="example">
|
|
<pre class="example">desktop
|
|
</pre></div>
|
|
<p>or
|
|
</p><div class="example">
|
|
<pre class="example">title=<var>window_title</var>
|
|
</pre></div>
|
|
|
|
<p>The first option will capture the entire desktop, or a fixed region of the
|
|
desktop. The second option will instead capture the contents of a single
|
|
window, regardless of its position on the screen.
|
|
</p>
|
|
<p>For example, to grab the entire desktop using <code>ffmpeg</code>:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg
|
|
</pre></div>
|
|
|
|
<p>Grab a 640x480 region at position <code>10,20</code>:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg
|
|
</pre></div>
|
|
|
|
<p>Grab the contents of the window named "Calculator"
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg
|
|
</pre></div>
|
|
|
|
<a name="Options-7"></a>
|
|
<h4 class="subsection">3.8.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-7" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>draw_mouse</samp></dt>
|
|
<dd><p>Specify whether to draw the mouse pointer. Use the value <code>0</code> to
|
|
not draw the pointer. Default value is <code>1</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the grabbing frame rate. Default value is <code>ntsc</code>,
|
|
corresponding to a frame rate of <code>30000/1001</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_region</samp></dt>
|
|
<dd><p>Show grabbed region on screen.
|
|
</p>
|
|
<p>If <var>show_region</var> is specified with <code>1</code>, then the grabbing
|
|
region will be indicated on screen. With this option, it is easy to
|
|
know what is being grabbed if only a portion of the screen is grabbed.
|
|
</p>
|
|
<p>Note that <var>show_region</var> is incompatible with grabbing the contents
|
|
of a single window.
|
|
</p>
|
|
<p>For example:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y 20 -i desktop out.mpg
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp>video_size</samp></dt>
|
|
<dd><p>Set the video frame size. The default is to capture the full screen if <samp>desktop</samp> is selected, or the full window size if <samp>title=<var>window_title</var></samp> is selected.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>offset_x</samp></dt>
|
|
<dd><p>When capturing a region with <var>video_size</var>, set the distance from the left edge of the screen or desktop.
|
|
</p>
|
|
<p>Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned to the left of your primary monitor, you will need to use a negative <var>offset_x</var> value to move the region to that monitor.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>offset_y</samp></dt>
|
|
<dd><p>When capturing a region with <var>video_size</var>, set the distance from the top edge of the screen or desktop.
|
|
</p>
|
|
<p>Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned above your primary monitor, you will need to use a negative <var>offset_y</var> value to move the region to that monitor.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="iec61883"></a>
|
|
<h3 class="section">3.9 iec61883<span class="pull-right"><a class="anchor hidden-xs" href="#iec61883" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-iec61883" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>FireWire DV/HDV input device using libiec61883.
|
|
</p>
|
|
<p>To enable this input device, you need libiec61883, libraw1394 and
|
|
libavc1394 installed on your system. Use the configure option
|
|
<code>--enable-libiec61883</code> to compile with the device enabled.
|
|
</p>
|
|
<p>The iec61883 capture device supports capturing from a video device
|
|
connected via IEEE1394 (FireWire), using libiec61883 and the new Linux
|
|
FireWire stack (juju). This is the default DV/HDV input method in Linux
|
|
Kernel 2.6.37 and later, since the old FireWire stack was removed.
|
|
</p>
|
|
<p>Specify the FireWire port to be used as input file, or "auto"
|
|
to choose the first port connected.
|
|
</p>
|
|
<a name="Options-8"></a>
|
|
<h4 class="subsection">3.9.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-8" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-8" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>dvtype</samp></dt>
|
|
<dd><p>Override autodetection of DV/HDV. This should only be used if auto
|
|
detection does not work, or if usage of a different device type
|
|
should be prohibited. Treating a DV device as HDV (or vice versa) will
|
|
not work and result in undefined behavior.
|
|
The values <samp>auto</samp>, <samp>dv</samp> and <samp>hdv</samp> are supported.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>dvbuffer</samp></dt>
|
|
<dd><p>Set maximum size of buffer for incoming data, in frames. For DV, this
|
|
is an exact value. For HDV, it is not frame exact, since HDV does
|
|
not have a fixed frame size.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>dvguid</samp></dt>
|
|
<dd><p>Select the capture device by specifying its GUID. Capturing will only
|
|
be performed from the specified device and fails if no device with the
|
|
given GUID is found. This is useful to select the input if multiple
|
|
devices are connected at the same time.
|
|
Look at /sys/bus/firewire/devices to find out the GUIDs.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-3"></a>
|
|
<h4 class="subsection">3.9.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-3" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-3" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> Grab and show the input of a FireWire DV/HDV device.
|
|
<div class="example">
|
|
<pre class="example">ffplay -f iec61883 -i auto
|
|
</pre></div>
|
|
|
|
</li><li> Grab and record the input of a FireWire DV/HDV device,
|
|
using a packet buffer of 100000 packets if the source is HDV.
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f iec61883 -i auto -hdvbuffer 100000 out.mpg
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
<a name="jack"></a>
|
|
<h3 class="section">3.10 jack<span class="pull-right"><a class="anchor hidden-xs" href="#jack" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-jack" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>JACK input device.
|
|
</p>
|
|
<p>To enable this input device during configuration you need libjack
|
|
installed on your system.
|
|
</p>
|
|
<p>A JACK input device creates one or more JACK writable clients, one for
|
|
each audio channel, with name <var>client_name</var>:input_<var>N</var>, where
|
|
<var>client_name</var> is the name provided by the application, and <var>N</var>
|
|
is a number which identifies the channel.
|
|
Each writable client will send the acquired data to the FFmpeg input
|
|
device.
|
|
</p>
|
|
<p>Once you have created one or more JACK readable clients, you need to
|
|
connect them to one or more JACK writable clients.
|
|
</p>
|
|
<p>To connect or disconnect JACK clients you can use the <code>jack_connect</code>
|
|
and <code>jack_disconnect</code> programs, or do it through a graphical interface,
|
|
for example with <code>qjackctl</code>.
|
|
</p>
|
|
<p>To list the JACK clients and their properties you can invoke the command
|
|
<code>jack_lsp</code>.
|
|
</p>
|
|
<p>Follows an example which shows how to capture a JACK readable client
|
|
with <code>ffmpeg</code>.
|
|
</p><div class="example">
|
|
<pre class="example"># Create a JACK writable client with name "ffmpeg".
|
|
$ ffmpeg -f jack -i ffmpeg -y out.wav
|
|
|
|
# Start the sample jack_metro readable client.
|
|
$ jack_metro -b 120 -d 0.2 -f 4000
|
|
|
|
# List the current JACK clients.
|
|
$ jack_lsp -c
|
|
system:capture_1
|
|
system:capture_2
|
|
system:playback_1
|
|
system:playback_2
|
|
ffmpeg:input_1
|
|
metro:120_bpm
|
|
|
|
# Connect metro to the ffmpeg writable client.
|
|
$ jack_connect metro:120_bpm ffmpeg:input_1
|
|
</pre></div>
|
|
|
|
<p>For more information read:
|
|
<a href="http://jackaudio.org/">http://jackaudio.org/</a>
|
|
</p>
|
|
<a name="Options-9"></a>
|
|
<h4 class="subsection">3.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-9" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-9" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Set the number of channels. Default is 2.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="lavfi"></a>
|
|
<h3 class="section">3.11 lavfi<span class="pull-right"><a class="anchor hidden-xs" href="#lavfi" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-lavfi" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Libavfilter input virtual device.
|
|
</p>
|
|
<p>This input device reads data from the open output pads of a libavfilter
|
|
filtergraph.
|
|
</p>
|
|
<p>For each filtergraph open output, the input device will create a
|
|
corresponding stream which is mapped to the generated output. Currently
|
|
only video data is supported. The filtergraph is specified through the
|
|
option <samp>graph</samp>.
|
|
</p>
|
|
<a name="Options-10"></a>
|
|
<h4 class="subsection">3.11.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-10" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-10" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>graph</samp></dt>
|
|
<dd><p>Specify the filtergraph to use as input. Each video open output must be
|
|
labelled by a unique string of the form "out<var>N</var>", where <var>N</var> is a
|
|
number starting from 0 corresponding to the mapped input stream
|
|
generated by the device.
|
|
The first unlabelled output is automatically assigned to the "out0"
|
|
label, but all the others need to be specified explicitly.
|
|
</p>
|
|
<p>The suffix "+subcc" can be appended to the output label to create an extra
|
|
stream with the closed captions packets attached to that output
|
|
(experimental; only for EIA-608 / CEA-708 for now).
|
|
The subcc streams are created after all the normal streams, in the order of
|
|
the corresponding stream.
|
|
For example, if there is "out19+subcc", "out7+subcc" and up to "out42", the
|
|
stream #43 is subcc for stream #7 and stream #44 is subcc for stream #19.
|
|
</p>
|
|
<p>If not specified defaults to the filename specified for the input
|
|
device.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>graph_file</samp></dt>
|
|
<dd><p>Set the filename of the filtergraph to be read and sent to the other
|
|
filters. Syntax of the filtergraph is the same as the one specified by
|
|
the option <var>graph</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>dumpgraph</samp></dt>
|
|
<dd><p>Dump graph to stderr.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-4"></a>
|
|
<h4 class="subsection">3.11.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-4" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-4" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> Create a color video stream and play it back with <code>ffplay</code>:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f lavfi -graph "color=c=pink [out0]" dummy
|
|
</pre></div>
|
|
|
|
</li><li> As the previous example, but use filename for specifying the graph
|
|
description, and omit the "out0" label:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f lavfi color=c=pink
|
|
</pre></div>
|
|
|
|
</li><li> Create three different video test filtered sources and play them:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3
|
|
</pre></div>
|
|
|
|
</li><li> Read an audio stream from a file using the amovie source and play it
|
|
back with <code>ffplay</code>:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f lavfi "amovie=test.wav"
|
|
</pre></div>
|
|
|
|
</li><li> Read an audio stream and a video stream and play it back with
|
|
<code>ffplay</code>:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"
|
|
</pre></div>
|
|
|
|
</li><li> Dump decoded frames to images and closed captions to a file (experimental):
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f lavfi -i "movie=test.ts[out0+subcc]" -map v frame%08d.png -map s -c copy -f rawvideo subcc.bin
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
<a name="libcdio"></a>
|
|
<h3 class="section">3.12 libcdio<span class="pull-right"><a class="anchor hidden-xs" href="#libcdio" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libcdio" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Audio-CD input device based on libcdio.
|
|
</p>
|
|
<p>To enable this input device during configuration you need libcdio
|
|
installed on your system. It requires the configure option
|
|
<code>--enable-libcdio</code>.
|
|
</p>
|
|
<p>This device allows playing and grabbing from an Audio-CD.
|
|
</p>
|
|
<p>For example to copy with <code>ffmpeg</code> the entire Audio-CD in <samp>/dev/sr0</samp>,
|
|
you may run the command:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f libcdio -i /dev/sr0 cd.wav
|
|
</pre></div>
|
|
|
|
<a name="Options-11"></a>
|
|
<h4 class="subsection">3.12.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-11" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-11" aria-hidden="true">TOC</a></span></h4>
|
|
<dl compact="compact">
|
|
<dt><samp>speed</samp></dt>
|
|
<dd><p>Set drive reading speed. Default value is 0.
|
|
</p>
|
|
<p>The speed is specified CD-ROM speed units. The speed is set through
|
|
the libcdio <code>cdio_cddap_speed_set</code> function. On many CD-ROM
|
|
drives, specifying a value too large will result in using the fastest
|
|
speed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>paranoia_mode</samp></dt>
|
|
<dd><p>Set paranoia recovery mode flags. It accepts one of the following values:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt>‘<samp>disable</samp>’</dt>
|
|
<dt>‘<samp>verify</samp>’</dt>
|
|
<dt>‘<samp>overlap</samp>’</dt>
|
|
<dt>‘<samp>neverskip</samp>’</dt>
|
|
<dt>‘<samp>full</samp>’</dt>
|
|
</dl>
|
|
|
|
<p>Default value is ‘<samp>disable</samp>’.
|
|
</p>
|
|
<p>For more information about the available recovery modes, consult the
|
|
paranoia project documentation.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="libdc1394"></a>
|
|
<h3 class="section">3.13 libdc1394<span class="pull-right"><a class="anchor hidden-xs" href="#libdc1394" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-libdc1394" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>IIDC1394 input device, based on libdc1394 and libraw1394.
|
|
</p>
|
|
<p>Requires the configure option <code>--enable-libdc1394</code>.
|
|
</p>
|
|
<a name="openal"></a>
|
|
<h3 class="section">3.14 openal<span class="pull-right"><a class="anchor hidden-xs" href="#openal" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-openal" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>The OpenAL input device provides audio capture on all systems with a
|
|
working OpenAL 1.1 implementation.
|
|
</p>
|
|
<p>To enable this input device during configuration, you need OpenAL
|
|
headers and libraries installed on your system, and need to configure
|
|
FFmpeg with <code>--enable-openal</code>.
|
|
</p>
|
|
<p>OpenAL headers and libraries should be provided as part of your OpenAL
|
|
implementation, or as an additional download (an SDK). Depending on your
|
|
installation you may need to specify additional flags via the
|
|
<code>--extra-cflags</code> and <code>--extra-ldflags</code> for allowing the build
|
|
system to locate the OpenAL headers and libraries.
|
|
</p>
|
|
<p>An incomplete list of OpenAL implementations follows:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><strong>Creative</strong></dt>
|
|
<dd><p>The official Windows implementation, providing hardware acceleration
|
|
with supported devices and software fallback.
|
|
See <a href="http://openal.org/">http://openal.org/</a>.
|
|
</p></dd>
|
|
<dt><strong>OpenAL Soft</strong></dt>
|
|
<dd><p>Portable, open source (LGPL) software implementation. Includes
|
|
backends for the most common sound APIs on the Windows, Linux,
|
|
Solaris, and BSD operating systems.
|
|
See <a href="http://kcat.strangesoft.net/openal.html">http://kcat.strangesoft.net/openal.html</a>.
|
|
</p></dd>
|
|
<dt><strong>Apple</strong></dt>
|
|
<dd><p>OpenAL is part of Core Audio, the official Mac OS X Audio interface.
|
|
See <a href="http://developer.apple.com/technologies/mac/audio-and-video.html">http://developer.apple.com/technologies/mac/audio-and-video.html</a>
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>This device allows one to capture from an audio input device handled
|
|
through OpenAL.
|
|
</p>
|
|
<p>You need to specify the name of the device to capture in the provided
|
|
filename. If the empty string is provided, the device will
|
|
automatically select the default device. You can get the list of the
|
|
supported devices by using the option <var>list_devices</var>.
|
|
</p>
|
|
<a name="Options-12"></a>
|
|
<h4 class="subsection">3.14.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-12" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-12" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Set the number of channels in the captured audio. Only the values
|
|
<samp>1</samp> (monaural) and <samp>2</samp> (stereo) are currently supported.
|
|
Defaults to <samp>2</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>sample_size</samp></dt>
|
|
<dd><p>Set the sample size (in bits) of the captured audio. Only the values
|
|
<samp>8</samp> and <samp>16</samp> are currently supported. Defaults to
|
|
<samp>16</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>sample_rate</samp></dt>
|
|
<dd><p>Set the sample rate (in Hz) of the captured audio.
|
|
Defaults to <samp>44.1k</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_devices</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of devices and exit.
|
|
Defaults to <samp>false</samp>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-5"></a>
|
|
<h4 class="subsection">3.14.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-5" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-5" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<p>Print the list of OpenAL supported devices and exit:
|
|
</p><div class="example">
|
|
<pre class="example">$ ffmpeg -list_devices true -f openal -i dummy out.ogg
|
|
</pre></div>
|
|
|
|
<p>Capture from the OpenAL device <samp>DR-BT101 via PulseAudio</samp>:
|
|
</p><div class="example">
|
|
<pre class="example">$ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg
|
|
</pre></div>
|
|
|
|
<p>Capture from the default device (note the empty string ” as filename):
|
|
</p><div class="example">
|
|
<pre class="example">$ ffmpeg -f openal -i '' out.ogg
|
|
</pre></div>
|
|
|
|
<p>Capture from two devices simultaneously, writing to two different files,
|
|
within the same <code>ffmpeg</code> command:
|
|
</p><div class="example">
|
|
<pre class="example">$ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg
|
|
</pre></div>
|
|
<p>Note: not all OpenAL implementations support multiple simultaneous capture -
|
|
try the latest OpenAL Soft if the above does not work.
|
|
</p>
|
|
<a name="oss"></a>
|
|
<h3 class="section">3.15 oss<span class="pull-right"><a class="anchor hidden-xs" href="#oss" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-oss" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Open Sound System input device.
|
|
</p>
|
|
<p>The filename to provide to the input device is the device node
|
|
representing the OSS input device, and is usually set to
|
|
<samp>/dev/dsp</samp>.
|
|
</p>
|
|
<p>For example to grab from <samp>/dev/dsp</samp> using <code>ffmpeg</code> use the
|
|
command:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
|
|
</pre></div>
|
|
|
|
<p>For more information about OSS see:
|
|
<a href="http://manuals.opensound.com/usersguide/dsp.html">http://manuals.opensound.com/usersguide/dsp.html</a>
|
|
</p>
|
|
<a name="Options-13"></a>
|
|
<h4 class="subsection">3.15.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-13" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-13" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>sample_rate</samp></dt>
|
|
<dd><p>Set the sample rate in Hz. Default is 48000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Set the number of channels. Default is 2.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
|
|
<a name="pulse"></a>
|
|
<h3 class="section">3.16 pulse<span class="pull-right"><a class="anchor hidden-xs" href="#pulse" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pulse" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>PulseAudio input device.
|
|
</p>
|
|
<p>To enable this output device you need to configure FFmpeg with <code>--enable-libpulse</code>.
|
|
</p>
|
|
<p>The filename to provide to the input device is a source device or the
|
|
string "default"
|
|
</p>
|
|
<p>To list the PulseAudio source devices and their properties you can invoke
|
|
the command <code>pactl list sources</code>.
|
|
</p>
|
|
<p>More information about PulseAudio can be found on <a href="http://www.pulseaudio.org">http://www.pulseaudio.org</a>.
|
|
</p>
|
|
<a name="Options-14"></a>
|
|
<h4 class="subsection">3.16.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-14" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-14" aria-hidden="true">TOC</a></span></h4>
|
|
<dl compact="compact">
|
|
<dt><samp>server</samp></dt>
|
|
<dd><p>Connect to a specific PulseAudio server, specified by an IP address.
|
|
Default server is used when not provided.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>name</samp></dt>
|
|
<dd><p>Specify the application name PulseAudio will use when showing active clients,
|
|
by default it is the <code>LIBAVFORMAT_IDENT</code> string.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>stream_name</samp></dt>
|
|
<dd><p>Specify the stream name PulseAudio will use when showing active streams,
|
|
by default it is "record".
|
|
</p>
|
|
</dd>
|
|
<dt><samp>sample_rate</samp></dt>
|
|
<dd><p>Specify the samplerate in Hz, by default 48kHz is used.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Specify the channels in use, by default 2 (stereo) is set.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>frame_size</samp></dt>
|
|
<dd><p>Specify the number of bytes per frame, by default it is set to 1024.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>fragment_size</samp></dt>
|
|
<dd><p>Specify the minimal buffering fragment in PulseAudio, it will affect the
|
|
audio latency. By default it is unset.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>wallclock</samp></dt>
|
|
<dd><p>Set the initial PTS using the current time. Default is 1.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-6"></a>
|
|
<h4 class="subsection">3.16.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-6" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-6" aria-hidden="true">TOC</a></span></h4>
|
|
<p>Record a stream from default device:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f pulse -i default /tmp/pulse.wav
|
|
</pre></div>
|
|
|
|
<a name="qtkit"></a>
|
|
<h3 class="section">3.17 qtkit<span class="pull-right"><a class="anchor hidden-xs" href="#qtkit" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-qtkit" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>QTKit input device.
|
|
</p>
|
|
<p>The filename passed as input is parsed to contain either a device name or index.
|
|
The device index can also be given by using -video_device_index.
|
|
A given device index will override any given device name.
|
|
If the desired device consists of numbers only, use -video_device_index to identify it.
|
|
The default device will be chosen if an empty string or the device name "default" is given.
|
|
The available devices can be enumerated by using -list_devices.
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f qtkit -i "0" out.mpg
|
|
</pre></div>
|
|
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f qtkit -video_device_index 0 -i "" out.mpg
|
|
</pre></div>
|
|
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f qtkit -i "default" out.mpg
|
|
</pre></div>
|
|
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f qtkit -list_devices true -i ""
|
|
</pre></div>
|
|
|
|
<a name="Options-15"></a>
|
|
<h4 class="subsection">3.17.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-15" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-15" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>frame_rate</samp></dt>
|
|
<dd><p>Set frame rate. Default is 30.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_devices</samp></dt>
|
|
<dd><p>If set to <code>true</code>, print a list of devices and exit. Default is
|
|
<code>false</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_device_index</samp></dt>
|
|
<dd><p>Select the video device by index for devices with the same name (starts at 0).
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="sndio"></a>
|
|
<h3 class="section">3.18 sndio<span class="pull-right"><a class="anchor hidden-xs" href="#sndio" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sndio" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>sndio input device.
|
|
</p>
|
|
<p>To enable this input device during configuration you need libsndio
|
|
installed on your system.
|
|
</p>
|
|
<p>The filename to provide to the input device is the device node
|
|
representing the sndio input device, and is usually set to
|
|
<samp>/dev/audio0</samp>.
|
|
</p>
|
|
<p>For example to grab from <samp>/dev/audio0</samp> using <code>ffmpeg</code> use the
|
|
command:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
|
|
</pre></div>
|
|
|
|
<a name="Options-16"></a>
|
|
<h4 class="subsection">3.18.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-16" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-16" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>sample_rate</samp></dt>
|
|
<dd><p>Set the sample rate in Hz. Default is 48000.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>channels</samp></dt>
|
|
<dd><p>Set the number of channels. Default is 2.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="video4linux2_002c-v4l2"></a>
|
|
<h3 class="section">3.19 video4linux2, v4l2<span class="pull-right"><a class="anchor hidden-xs" href="#video4linux2_002c-v4l2" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-video4linux2_002c-v4l2" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Video4Linux2 input video device.
|
|
</p>
|
|
<p>"v4l2" can be used as alias for "video4linux2".
|
|
</p>
|
|
<p>If FFmpeg is built with v4l-utils support (by using the
|
|
<code>--enable-libv4l2</code> configure option), it is possible to use it with the
|
|
<code>-use_libv4l2</code> input device option.
|
|
</p>
|
|
<p>The name of the device to grab is a file device node, usually Linux
|
|
systems tend to automatically create such nodes when the device
|
|
(e.g. an USB webcam) is plugged into the system, and has a name of the
|
|
kind <samp>/dev/video<var>N</var></samp>, where <var>N</var> is a number associated to
|
|
the device.
|
|
</p>
|
|
<p>Video4Linux2 devices usually support a limited set of
|
|
<var>width</var>x<var>height</var> sizes and frame rates. You can check which are
|
|
supported using <code>-list_formats all</code> for Video4Linux2 devices.
|
|
Some devices, like TV cards, support one or more standards. It is possible
|
|
to list all the supported standards using <code>-list_standards all</code>.
|
|
</p>
|
|
<p>The time base for the timestamps is 1 microsecond. Depending on the kernel
|
|
version and configuration, the timestamps may be derived from the real time
|
|
clock (origin at the Unix Epoch) or the monotonic clock (origin usually at
|
|
boot time, unaffected by NTP or manual changes to the clock). The
|
|
<samp>-timestamps abs</samp> or <samp>-ts abs</samp> option can be used to force
|
|
conversion into the real time clock.
|
|
</p>
|
|
<p>Some usage examples of the video4linux2 device with <code>ffmpeg</code>
|
|
and <code>ffplay</code>:
|
|
</p><ul>
|
|
<li> List supported formats for a video4linux2 device:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f video4linux2 -list_formats all /dev/video0
|
|
</pre></div>
|
|
|
|
</li><li> Grab and show the input of a video4linux2 device:
|
|
<div class="example">
|
|
<pre class="example">ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
|
|
</pre></div>
|
|
|
|
</li><li> Grab and record the input of a video4linux2 device, leave the
|
|
frame rate and size as previously set:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
<p>For more information about Video4Linux, check <a href="http://linuxtv.org/">http://linuxtv.org/</a>.
|
|
</p>
|
|
<a name="Options-17"></a>
|
|
<h4 class="subsection">3.19.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-17" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-17" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>standard</samp></dt>
|
|
<dd><p>Set the standard. Must be the name of a supported standard. To get a
|
|
list of the supported standards, use the <samp>list_standards</samp>
|
|
option.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>channel</samp></dt>
|
|
<dd><p>Set the input channel number. Default to -1, which means using the
|
|
previously selected channel.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>video_size</samp></dt>
|
|
<dd><p>Set the video frame size. The argument must be a string in the form
|
|
<var>WIDTH</var>x<var>HEIGHT</var> or a valid size abbreviation.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>pixel_format</samp></dt>
|
|
<dd><p>Select the pixel format (only valid for raw video input).
|
|
</p>
|
|
</dd>
|
|
<dt><samp>input_format</samp></dt>
|
|
<dd><p>Set the preferred pixel format (for raw video) or a codec name.
|
|
This option allows one to select the input format, when several are
|
|
available.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the preferred video frame rate.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_formats</samp></dt>
|
|
<dd><p>List available formats (supported pixel formats, codecs, and frame
|
|
sizes) and exit.
|
|
</p>
|
|
<p>Available values are:
|
|
</p><dl compact="compact">
|
|
<dt>‘<samp>all</samp>’</dt>
|
|
<dd><p>Show all available (compressed and non-compressed) formats.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp>raw</samp>’</dt>
|
|
<dd><p>Show only raw video (non-compressed) formats.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp>compressed</samp>’</dt>
|
|
<dd><p>Show only compressed formats.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp>list_standards</samp></dt>
|
|
<dd><p>List supported standards and exit.
|
|
</p>
|
|
<p>Available values are:
|
|
</p><dl compact="compact">
|
|
<dt>‘<samp>all</samp>’</dt>
|
|
<dd><p>Show all supported standards.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><samp>timestamps, ts</samp></dt>
|
|
<dd><p>Set type of timestamps for grabbed frames.
|
|
</p>
|
|
<p>Available values are:
|
|
</p><dl compact="compact">
|
|
<dt>‘<samp>default</samp>’</dt>
|
|
<dd><p>Use timestamps from the kernel.
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp>abs</samp>’</dt>
|
|
<dd><p>Use absolute timestamps (wall clock).
|
|
</p>
|
|
</dd>
|
|
<dt>‘<samp>mono2abs</samp>’</dt>
|
|
<dd><p>Force conversion from monotonic to absolute timestamps.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>Default value is <code>default</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>use_libv4l2</samp></dt>
|
|
<dd><p>Use libv4l2 (v4l-utils) conversion functions. Default is 0.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="vfwcap"></a>
|
|
<h3 class="section">3.20 vfwcap<span class="pull-right"><a class="anchor hidden-xs" href="#vfwcap" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-vfwcap" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>VfW (Video for Windows) capture input device.
|
|
</p>
|
|
<p>The filename passed as input is the capture driver number, ranging from
|
|
0 to 9. You may use "list" as filename to print a list of drivers. Any
|
|
other filename will be interpreted as device number 0.
|
|
</p>
|
|
<a name="Options-18"></a>
|
|
<h4 class="subsection">3.20.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-18" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-18" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>video_size</samp></dt>
|
|
<dd><p>Set the video frame size.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the grabbing frame rate. Default value is <code>ntsc</code>,
|
|
corresponding to a frame rate of <code>30000/1001</code>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="x11grab"></a>
|
|
<h3 class="section">3.21 x11grab<span class="pull-right"><a class="anchor hidden-xs" href="#x11grab" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-x11grab" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>X11 video input device.
|
|
</p>
|
|
<p>To enable this input device during configuration you need libxcb
|
|
installed on your system. It will be automatically detected during
|
|
configuration.
|
|
</p>
|
|
<p>Alternatively, the configure option <samp>--enable-x11grab</samp> exists
|
|
for legacy Xlib users.
|
|
</p>
|
|
<p>This device allows one to capture a region of an X11 display.
|
|
</p>
|
|
<p>The filename passed as input has the syntax:
|
|
</p><div class="example">
|
|
<pre class="example">[<var>hostname</var>]:<var>display_number</var>.<var>screen_number</var>[+<var>x_offset</var>,<var>y_offset</var>]
|
|
</pre></div>
|
|
|
|
<p><var>hostname</var>:<var>display_number</var>.<var>screen_number</var> specifies the
|
|
X11 display name of the screen to grab from. <var>hostname</var> can be
|
|
omitted, and defaults to "localhost". The environment variable
|
|
<code>DISPLAY</code> contains the default display name.
|
|
</p>
|
|
<p><var>x_offset</var> and <var>y_offset</var> specify the offsets of the grabbed
|
|
area with respect to the top-left border of the X11 screen. They
|
|
default to 0.
|
|
</p>
|
|
<p>Check the X11 documentation (e.g. <code>man X</code>) for more detailed
|
|
information.
|
|
</p>
|
|
<p>Use the <code>xdpyinfo</code> program for getting basic information about
|
|
the properties of your X11 display (e.g. grep for "name" or
|
|
"dimensions").
|
|
</p>
|
|
<p>For example to grab from <samp>:0.0</samp> using <code>ffmpeg</code>:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
</pre></div>
|
|
|
|
<p>Grab at position <code>10,20</code>:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
|
|
</pre></div>
|
|
|
|
<a name="Options-19"></a>
|
|
<h4 class="subsection">3.21.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-19" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-19" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>draw_mouse</samp></dt>
|
|
<dd><p>Specify whether to draw the mouse pointer. A value of <code>0</code> specifies
|
|
not to draw the pointer. Default value is <code>1</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>follow_mouse</samp></dt>
|
|
<dd><p>Make the grabbed area follow the mouse. The argument can be
|
|
<code>centered</code> or a number of pixels <var>PIXELS</var>.
|
|
</p>
|
|
<p>When it is specified with "centered", the grabbing region follows the mouse
|
|
pointer and keeps the pointer at the center of region; otherwise, the region
|
|
follows only when the mouse pointer reaches within <var>PIXELS</var> (greater than
|
|
zero) to the edge of region.
|
|
</p>
|
|
<p>For example:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
</pre></div>
|
|
|
|
<p>To follow only when the mouse pointer reaches within 100 pixels to edge:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp>framerate</samp></dt>
|
|
<dd><p>Set the grabbing frame rate. Default value is <code>ntsc</code>,
|
|
corresponding to a frame rate of <code>30000/1001</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>show_region</samp></dt>
|
|
<dd><p>Show grabbed region on screen.
|
|
</p>
|
|
<p>If <var>show_region</var> is specified with <code>1</code>, then the grabbing
|
|
region will be indicated on screen. With this option, it is easy to
|
|
know what is being grabbed if only a portion of the screen is grabbed.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>region_border</samp></dt>
|
|
<dd><p>Set the region border thickness if <samp>-show_region 1</samp> is used.
|
|
Range is 1 to 128 and default is 3 (XCB-based x11grab only).
|
|
</p>
|
|
<p>For example:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
|
|
</pre></div>
|
|
|
|
<p>With <var>follow_mouse</var>:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><samp>video_size</samp></dt>
|
|
<dd><p>Set the video frame size. Default value is <code>vga</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>use_shm</samp></dt>
|
|
<dd><p>Use the MIT-SHM extension for shared memory. Default value is <code>1</code>.
|
|
It may be necessary to disable it for remote displays (legacy x11grab
|
|
only).
|
|
</p>
|
|
</dd>
|
|
<dt><samp>grab_x</samp></dt>
|
|
<dt><samp>grab_y</samp></dt>
|
|
<dd><p>Set the grabbing region coordinates. They are expressed as offset from
|
|
the top left corner of the X11 window and correspond to the
|
|
<var>x_offset</var> and <var>y_offset</var> parameters in the device name. The
|
|
default value for both options is 0.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Output-Devices"></a>
|
|
<h2 class="chapter">4 Output Devices<span class="pull-right"><a class="anchor hidden-xs" href="#Output-Devices" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Output-Devices" aria-hidden="true">TOC</a></span></h2>
|
|
|
|
<p>Output devices are configured elements in FFmpeg that can write
|
|
multimedia data to an output device attached to your system.
|
|
</p>
|
|
<p>When you configure your FFmpeg build, all the supported output devices
|
|
are enabled by default. You can list all available ones using the
|
|
configure option "–list-outdevs".
|
|
</p>
|
|
<p>You can disable all the output devices using the configure option
|
|
"–disable-outdevs", and selectively enable an output device using the
|
|
option "–enable-outdev=<var>OUTDEV</var>", or you can disable a particular
|
|
input device using the option "–disable-outdev=<var>OUTDEV</var>".
|
|
</p>
|
|
<p>The option "-devices" of the ff* tools will display the list of
|
|
enabled output devices.
|
|
</p>
|
|
<p>A description of the currently available output devices follows.
|
|
</p>
|
|
<a name="alsa-1"></a>
|
|
<h3 class="section">4.1 alsa<span class="pull-right"><a class="anchor hidden-xs" href="#alsa-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-alsa-1" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>ALSA (Advanced Linux Sound Architecture) output device.
|
|
</p>
|
|
<a name="Examples-7"></a>
|
|
<h4 class="subsection">4.1.1 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-7" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-7" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> Play a file on default ALSA device:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -f alsa default
|
|
</pre></div>
|
|
|
|
</li><li> Play a file on soundcard 1, audio device 7:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -f alsa hw:1,7
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
<a name="caca"></a>
|
|
<h3 class="section">4.2 caca<span class="pull-right"><a class="anchor hidden-xs" href="#caca" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-caca" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>CACA output device.
|
|
</p>
|
|
<p>This output device allows one to show a video stream in CACA window.
|
|
Only one CACA window is allowed per application, so you can
|
|
have only one instance of this output device in an application.
|
|
</p>
|
|
<p>To enable this output device you need to configure FFmpeg with
|
|
<code>--enable-libcaca</code>.
|
|
libcaca is a graphics library that outputs text instead of pixels.
|
|
</p>
|
|
<p>For more information about libcaca, check:
|
|
<a href="http://caca.zoy.org/wiki/libcaca">http://caca.zoy.org/wiki/libcaca</a>
|
|
</p>
|
|
<a name="Options-20"></a>
|
|
<h4 class="subsection">4.2.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-20" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-20" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>window_title</samp></dt>
|
|
<dd><p>Set the CACA window title, if not specified default to the filename
|
|
specified for the output device.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_size</samp></dt>
|
|
<dd><p>Set the CACA window size, can be a string of the form
|
|
<var>width</var>x<var>height</var> or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>driver</samp></dt>
|
|
<dd><p>Set display driver.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>algorithm</samp></dt>
|
|
<dd><p>Set dithering algorithm. Dithering is necessary
|
|
because the picture being rendered has usually far more colours than
|
|
the available palette.
|
|
The accepted values are listed with <code>-list_dither algorithms</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>antialias</samp></dt>
|
|
<dd><p>Set antialias method. Antialiasing smoothens the rendered
|
|
image and avoids the commonly seen staircase effect.
|
|
The accepted values are listed with <code>-list_dither antialiases</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>charset</samp></dt>
|
|
<dd><p>Set which characters are going to be used when rendering text.
|
|
The accepted values are listed with <code>-list_dither charsets</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>color</samp></dt>
|
|
<dd><p>Set color to be used when rendering text.
|
|
The accepted values are listed with <code>-list_dither colors</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_drivers</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of available drivers and exit.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_dither</samp></dt>
|
|
<dd><p>List available dither options related to the argument.
|
|
The argument must be one of <code>algorithms</code>, <code>antialiases</code>,
|
|
<code>charsets</code>, <code>colors</code>.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Examples-8"></a>
|
|
<h4 class="subsection">4.2.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-8" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-8" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> The following command shows the <code>ffmpeg</code> output is an
|
|
CACA window, forcing its size to 80x25:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -vcodec rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
|
|
</pre></div>
|
|
|
|
</li><li> Show the list of available drivers and exit:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
|
|
</pre></div>
|
|
|
|
</li><li> Show the list of available dither colors and exit:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
<a name="decklink-1"></a>
|
|
<h3 class="section">4.3 decklink<span class="pull-right"><a class="anchor hidden-xs" href="#decklink-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-decklink-1" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>The decklink output device provides playback capabilities for Blackmagic
|
|
DeckLink devices.
|
|
</p>
|
|
<p>To enable this output device, you need the Blackmagic DeckLink SDK and you
|
|
need to configure with the appropriate <code>--extra-cflags</code>
|
|
and <code>--extra-ldflags</code>.
|
|
On Windows, you need to run the IDL files through <code>widl</code>.
|
|
</p>
|
|
<p>DeckLink is very picky about the formats it supports. Pixel format is always
|
|
uyvy422, framerate and video size must be determined for your device with
|
|
<code>-list_formats 1</code>. Audio sample rate is always 48 kHz.
|
|
</p>
|
|
<a name="Options-21"></a>
|
|
<h4 class="subsection">4.3.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-21" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-21" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>list_devices</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of devices and exit.
|
|
Defaults to <samp>false</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>list_formats</samp></dt>
|
|
<dd><p>If set to <samp>true</samp>, print a list of supported formats and exit.
|
|
Defaults to <samp>false</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>preroll</samp></dt>
|
|
<dd><p>Amount of time to preroll video in seconds.
|
|
Defaults to <samp>0.5</samp>.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-9"></a>
|
|
<h4 class="subsection">4.3.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-9" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-9" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> List output devices:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i test.avi -f decklink -list_devices 1 dummy
|
|
</pre></div>
|
|
|
|
</li><li> List supported formats:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i test.avi -f decklink -list_formats 1 'DeckLink Mini Monitor'
|
|
</pre></div>
|
|
|
|
</li><li> Play video clip:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'
|
|
</pre></div>
|
|
|
|
</li><li> Play video clip with non-standard framerate or video size:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'
|
|
</pre></div>
|
|
|
|
</li></ul>
|
|
|
|
<a name="fbdev-1"></a>
|
|
<h3 class="section">4.4 fbdev<span class="pull-right"><a class="anchor hidden-xs" href="#fbdev-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-fbdev-1" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>Linux framebuffer output device.
|
|
</p>
|
|
<p>The Linux framebuffer is a graphic hardware-independent abstraction
|
|
layer to show graphics on a computer monitor, typically on the
|
|
console. It is accessed through a file device node, usually
|
|
<samp>/dev/fb0</samp>.
|
|
</p>
|
|
<p>For more detailed information read the file
|
|
<samp>Documentation/fb/framebuffer.txt</samp> included in the Linux source tree.
|
|
</p>
|
|
<a name="Options-22"></a>
|
|
<h4 class="subsection">4.4.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-22" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-22" aria-hidden="true">TOC</a></span></h4>
|
|
<dl compact="compact">
|
|
<dt><samp>xoffset</samp></dt>
|
|
<dt><samp>yoffset</samp></dt>
|
|
<dd><p>Set x/y coordinate of top left corner. Default is 0.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Examples-10"></a>
|
|
<h4 class="subsection">4.4.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-10" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-10" aria-hidden="true">TOC</a></span></h4>
|
|
<p>Play a file on framebuffer device <samp>/dev/fb0</samp>.
|
|
Required pixel format depends on current framebuffer settings.
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -re -i INPUT -vcodec rawvideo -pix_fmt bgra -f fbdev /dev/fb0
|
|
</pre></div>
|
|
|
|
<p>See also <a href="http://linux-fbdev.sourceforge.net/">http://linux-fbdev.sourceforge.net/</a>, and fbset(1).
|
|
</p>
|
|
<a name="opengl"></a>
|
|
<h3 class="section">4.5 opengl<span class="pull-right"><a class="anchor hidden-xs" href="#opengl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-opengl" aria-hidden="true">TOC</a></span></h3>
|
|
<p>OpenGL output device.
|
|
</p>
|
|
<p>To enable this output device you need to configure FFmpeg with <code>--enable-opengl</code>.
|
|
</p>
|
|
<p>This output device allows one to render to OpenGL context.
|
|
Context may be provided by application or default SDL window is created.
|
|
</p>
|
|
<p>When device renders to external context, application must implement handlers for following messages:
|
|
<code>AV_DEV_TO_APP_CREATE_WINDOW_BUFFER</code> - create OpenGL context on current thread.
|
|
<code>AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER</code> - make OpenGL context current.
|
|
<code>AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER</code> - swap buffers.
|
|
<code>AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER</code> - destroy OpenGL context.
|
|
Application is also required to inform a device about current resolution by sending <code>AV_APP_TO_DEV_WINDOW_SIZE</code> message.
|
|
</p>
|
|
<a name="Options-23"></a>
|
|
<h4 class="subsection">4.5.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-23" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-23" aria-hidden="true">TOC</a></span></h4>
|
|
<dl compact="compact">
|
|
<dt><samp>background</samp></dt>
|
|
<dd><p>Set background color. Black is a default.
|
|
</p></dd>
|
|
<dt><samp>no_window</samp></dt>
|
|
<dd><p>Disables default SDL window when set to non-zero value.
|
|
Application must provide OpenGL context and both <code>window_size_cb</code> and <code>window_swap_buffers_cb</code> callbacks when set.
|
|
</p></dd>
|
|
<dt><samp>window_title</samp></dt>
|
|
<dd><p>Set the SDL window title, if not specified default to the filename specified for the output device.
|
|
Ignored when <samp>no_window</samp> is set.
|
|
</p></dd>
|
|
<dt><samp>window_size</samp></dt>
|
|
<dd><p>Set preferred window size, can be a string of the form widthxheight or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video, downscaled according to the aspect ratio.
|
|
Mostly usable when <samp>no_window</samp> is not set.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-11"></a>
|
|
<h4 class="subsection">4.5.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-11" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-11" aria-hidden="true">TOC</a></span></h4>
|
|
<p>Play a file on SDL window using OpenGL rendering:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -f opengl "window title"
|
|
</pre></div>
|
|
|
|
<a name="oss-1"></a>
|
|
<h3 class="section">4.6 oss<span class="pull-right"><a class="anchor hidden-xs" href="#oss-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-oss-1" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>OSS (Open Sound System) output device.
|
|
</p>
|
|
<a name="pulse-1"></a>
|
|
<h3 class="section">4.7 pulse<span class="pull-right"><a class="anchor hidden-xs" href="#pulse-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-pulse-1" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>PulseAudio output device.
|
|
</p>
|
|
<p>To enable this output device you need to configure FFmpeg with <code>--enable-libpulse</code>.
|
|
</p>
|
|
<p>More information about PulseAudio can be found on <a href="http://www.pulseaudio.org">http://www.pulseaudio.org</a>
|
|
</p>
|
|
<a name="Options-24"></a>
|
|
<h4 class="subsection">4.7.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-24" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-24" aria-hidden="true">TOC</a></span></h4>
|
|
<dl compact="compact">
|
|
<dt><samp>server</samp></dt>
|
|
<dd><p>Connect to a specific PulseAudio server, specified by an IP address.
|
|
Default server is used when not provided.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>name</samp></dt>
|
|
<dd><p>Specify the application name PulseAudio will use when showing active clients,
|
|
by default it is the <code>LIBAVFORMAT_IDENT</code> string.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>stream_name</samp></dt>
|
|
<dd><p>Specify the stream name PulseAudio will use when showing active streams,
|
|
by default it is set to the specified output name.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>device</samp></dt>
|
|
<dd><p>Specify the device to use. Default device is used when not provided.
|
|
List of output devices can be obtained with command <code>pactl list sinks</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>buffer_size</samp></dt>
|
|
<dt><samp>buffer_duration</samp></dt>
|
|
<dd><p>Control the size and duration of the PulseAudio buffer. A small buffer
|
|
gives more control, but requires more frequent updates.
|
|
</p>
|
|
<p><samp>buffer_size</samp> specifies size in bytes while
|
|
<samp>buffer_duration</samp> specifies duration in milliseconds.
|
|
</p>
|
|
<p>When both options are provided then the highest value is used
|
|
(duration is recalculated to bytes using stream parameters). If they
|
|
are set to 0 (which is default), the device will use the default
|
|
PulseAudio duration value. By default PulseAudio set buffer duration
|
|
to around 2 seconds.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>prebuf</samp></dt>
|
|
<dd><p>Specify pre-buffering size in bytes. The server does not start with
|
|
playback before at least <samp>prebuf</samp> bytes are available in the
|
|
buffer. By default this option is initialized to the same value as
|
|
<samp>buffer_size</samp> or <samp>buffer_duration</samp> (whichever is bigger).
|
|
</p>
|
|
</dd>
|
|
<dt><samp>minreq</samp></dt>
|
|
<dd><p>Specify minimum request size in bytes. The server does not request less
|
|
than <samp>minreq</samp> bytes from the client, instead waits until the buffer
|
|
is free enough to request more bytes at once. It is recommended to not set
|
|
this option, which will initialize this to a value that is deemed sensible
|
|
by the server.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<a name="Examples-12"></a>
|
|
<h4 class="subsection">4.7.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-12" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-12" aria-hidden="true">TOC</a></span></h4>
|
|
<p>Play a file on default device on default server:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -f pulse "stream name"
|
|
</pre></div>
|
|
|
|
<a name="sdl"></a>
|
|
<h3 class="section">4.8 sdl<span class="pull-right"><a class="anchor hidden-xs" href="#sdl" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sdl" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>SDL (Simple DirectMedia Layer) output device.
|
|
</p>
|
|
<p>This output device allows one to show a video stream in an SDL
|
|
window. Only one SDL window is allowed per application, so you can
|
|
have only one instance of this output device in an application.
|
|
</p>
|
|
<p>To enable this output device you need libsdl installed on your system
|
|
when configuring your build.
|
|
</p>
|
|
<p>For more information about SDL, check:
|
|
<a href="http://www.libsdl.org/">http://www.libsdl.org/</a>
|
|
</p>
|
|
<a name="Options-25"></a>
|
|
<h4 class="subsection">4.8.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-25" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-25" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>window_title</samp></dt>
|
|
<dd><p>Set the SDL window title, if not specified default to the filename
|
|
specified for the output device.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>icon_title</samp></dt>
|
|
<dd><p>Set the name of the iconified SDL window, if not specified it is set
|
|
to the same value of <var>window_title</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_size</samp></dt>
|
|
<dd><p>Set the SDL window size, can be a string of the form
|
|
<var>width</var>x<var>height</var> or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video,
|
|
downscaled according to the aspect ratio.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_fullscreen</samp></dt>
|
|
<dd><p>Set fullscreen mode when non-zero value is provided.
|
|
Default value is zero.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Interactive-commands"></a>
|
|
<h4 class="subsection">4.8.2 Interactive commands<span class="pull-right"><a class="anchor hidden-xs" href="#Interactive-commands" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Interactive-commands" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<p>The window created by the device can be controlled through the
|
|
following interactive commands.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><tt class="key">q, ESC</tt></dt>
|
|
<dd><p>Quit the device immediately.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Examples-13"></a>
|
|
<h4 class="subsection">4.8.3 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-13" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-13" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<p>The following command shows the <code>ffmpeg</code> output is an
|
|
SDL window, forcing its size to the qcif format:
|
|
</p><div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -vcodec rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL output"
|
|
</pre></div>
|
|
|
|
<a name="sndio-1"></a>
|
|
<h3 class="section">4.9 sndio<span class="pull-right"><a class="anchor hidden-xs" href="#sndio-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-sndio-1" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>sndio audio output device.
|
|
</p>
|
|
<a name="xv"></a>
|
|
<h3 class="section">4.10 xv<span class="pull-right"><a class="anchor hidden-xs" href="#xv" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-xv" aria-hidden="true">TOC</a></span></h3>
|
|
|
|
<p>XV (XVideo) output device.
|
|
</p>
|
|
<p>This output device allows one to show a video stream in a X Window System
|
|
window.
|
|
</p>
|
|
<a name="Options-26"></a>
|
|
<h4 class="subsection">4.10.1 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options-26" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options-26" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<dl compact="compact">
|
|
<dt><samp>display_name</samp></dt>
|
|
<dd><p>Specify the hardware display name, which determines the display and
|
|
communications domain to be used.
|
|
</p>
|
|
<p>The display name or DISPLAY environment variable can be a string in
|
|
the format <var>hostname</var>[:<var>number</var>[.<var>screen_number</var>]].
|
|
</p>
|
|
<p><var>hostname</var> specifies the name of the host machine on which the
|
|
display is physically attached. <var>number</var> specifies the number of
|
|
the display server on that host machine. <var>screen_number</var> specifies
|
|
the screen to be used on that server.
|
|
</p>
|
|
<p>If unspecified, it defaults to the value of the DISPLAY environment
|
|
variable.
|
|
</p>
|
|
<p>For example, <code>dual-headed:0.1</code> would specify screen 1 of display
|
|
0 on the machine named “dual-headed”.
|
|
</p>
|
|
<p>Check the X11 specification for more detailed information about the
|
|
display name format.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_id</samp></dt>
|
|
<dd><p>When set to non-zero value then device doesn’t create new window,
|
|
but uses existing one with provided <var>window_id</var>. By default
|
|
this options is set to zero and device creates its own window.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_size</samp></dt>
|
|
<dd><p>Set the created window size, can be a string of the form
|
|
<var>width</var>x<var>height</var> or a video size abbreviation. If not
|
|
specified it defaults to the size of the input video.
|
|
Ignored when <var>window_id</var> is set.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_x</samp></dt>
|
|
<dt><samp>window_y</samp></dt>
|
|
<dd><p>Set the X and Y window offsets for the created window. They are both
|
|
set to 0 by default. The values may be ignored by the window manager.
|
|
Ignored when <var>window_id</var> is set.
|
|
</p>
|
|
</dd>
|
|
<dt><samp>window_title</samp></dt>
|
|
<dd><p>Set the window title, if not specified default to the filename
|
|
specified for the output device. Ignored when <var>window_id</var> is set.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>For more information about XVideo see <a href="http://www.x.org/">http://www.x.org/</a>.
|
|
</p>
|
|
<a name="Examples-14"></a>
|
|
<h4 class="subsection">4.10.2 Examples<span class="pull-right"><a class="anchor hidden-xs" href="#Examples-14" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Examples-14" aria-hidden="true">TOC</a></span></h4>
|
|
|
|
<ul>
|
|
<li> Decode, display and encode video input with <code>ffmpeg</code> at the
|
|
same time:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT OUTPUT -f xv display
|
|
</pre></div>
|
|
|
|
</li><li> Decode and display the input video to multiple X11 windows:
|
|
<div class="example">
|
|
<pre class="example">ffmpeg -i INPUT -f xv normal -vf negate -f xv negated
|
|
</pre></div>
|
|
</li></ul>
|
|
|
|
|
|
<a name="See-Also"></a>
|
|
<h2 class="chapter">5 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 href="ffmpeg.html">ffmpeg</a>, <a href="ffplay.html">ffplay</a>, <a href="ffprobe.html">ffprobe</a>, <a href="ffserver.html">ffserver</a>,
|
|
<a href="libavdevice.html">libavdevice</a>
|
|
</p>
|
|
|
|
<a name="Authors"></a>
|
|
<h2 class="chapter">6 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
|
|
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
|
|
<code>git log</code> in the FFmpeg source directory, or browsing the
|
|
online repository at <a href="http://source.ffmpeg.org">http://source.ffmpeg.org</a>.
|
|
</p>
|
|
<p>Maintainers for the specific components are listed in the file
|
|
<samp>MAINTAINERS</samp> in the source code tree.
|
|
</p>
|
|
|
|
|
|
<p style="font-size: small;">
|
|
This document was generated using <a href="http://www.gnu.org/software/texinfo/"><em>makeinfo</em></a>.
|
|
</p>
|
|
</div>
|
|
</body>
|
|
</html>
|