diff options
Diffstat (limited to 'Music/ffmpeg/doc/ffmpeg-devices.html')
| -rw-r--r-- | Music/ffmpeg/doc/ffmpeg-devices.html | 2234 |
1 files changed, 0 insertions, 2234 deletions
diff --git a/Music/ffmpeg/doc/ffmpeg-devices.html b/Music/ffmpeg/doc/ffmpeg-devices.html deleted file mode 100644 index 25bc19b..0000000 --- a/Music/ffmpeg/doc/ffmpeg-devices.html +++ /dev/null @@ -1,2234 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> -<html> -<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> - <head> - <meta charset="utf-8"> - <title> - FFmpeg Devices Documentation - </title> - <meta name="viewport" content="width=device-width,initial-scale=1.0"> - <link rel="stylesheet" type="text/css" href="bootstrap.min.css"> - <link rel="stylesheet" type="text/css" href="style.min.css"> - </head> - <body> - <div class="container"> - <h1> - FFmpeg Devices Documentation - </h1> -<div align="center"> -</div> - - -<a name="SEC_Top"></a> - -<a name="SEC_Contents"></a> -<h2 class="contents-heading">Table of Contents</h2> - -<div class="contents"> - -<ul class="no-bullet"> - <li><a name="toc-Description" href="#Description">1 Description</a></li> - <li><a name="toc-Device-Options" href="#Device-Options">2 Device Options</a></li> - <li><a name="toc-Input-Devices" href="#Input-Devices">3 Input Devices</a> - <ul class="no-bullet"> - <li><a name="toc-alsa" href="#alsa">3.1 alsa</a> - <ul class="no-bullet"> - <li><a name="toc-Options" href="#Options">3.1.1 Options</a></li> - </ul></li> - <li><a name="toc-avfoundation" href="#avfoundation">3.2 avfoundation</a> - <ul class="no-bullet"> - <li><a name="toc-Options-1" href="#Options-1">3.2.1 Options</a></li> - <li><a name="toc-Examples" href="#Examples">3.2.2 Examples</a></li> - </ul></li> - <li><a name="toc-bktr" href="#bktr">3.3 bktr</a> - <ul class="no-bullet"> - <li><a name="toc-Options-2" href="#Options-2">3.3.1 Options</a></li> - </ul></li> - <li><a name="toc-decklink" href="#decklink">3.4 decklink</a> - <ul class="no-bullet"> - <li><a name="toc-Options-3" href="#Options-3">3.4.1 Options</a></li> - <li><a name="toc-Examples-1" href="#Examples-1">3.4.2 Examples</a></li> - </ul></li> - <li><a name="toc-dshow" href="#dshow">3.5 dshow</a> - <ul class="no-bullet"> - <li><a name="toc-Options-4" href="#Options-4">3.5.1 Options</a></li> - <li><a name="toc-Examples-2" href="#Examples-2">3.5.2 Examples</a></li> - </ul></li> - <li><a name="toc-dv1394" href="#dv1394">3.6 dv1394</a> - <ul class="no-bullet"> - <li><a name="toc-Options-5" href="#Options-5">3.6.1 Options</a></li> - </ul></li> - <li><a name="toc-fbdev" href="#fbdev">3.7 fbdev</a> - <ul class="no-bullet"> - <li><a name="toc-Options-6" href="#Options-6">3.7.1 Options</a></li> - </ul></li> - <li><a name="toc-gdigrab" href="#gdigrab">3.8 gdigrab</a> - <ul class="no-bullet"> - <li><a name="toc-Options-7" href="#Options-7">3.8.1 Options</a></li> - </ul></li> - <li><a name="toc-iec61883" href="#iec61883">3.9 iec61883</a> - <ul class="no-bullet"> - <li><a name="toc-Options-8" href="#Options-8">3.9.1 Options</a></li> - <li><a name="toc-Examples-3" href="#Examples-3">3.9.2 Examples</a></li> - </ul></li> - <li><a name="toc-jack" href="#jack">3.10 jack</a> - <ul class="no-bullet"> - <li><a name="toc-Options-9" href="#Options-9">3.10.1 Options</a></li> - </ul></li> - <li><a name="toc-lavfi" href="#lavfi">3.11 lavfi</a> - <ul class="no-bullet"> - <li><a name="toc-Options-10" href="#Options-10">3.11.1 Options</a></li> - <li><a name="toc-Examples-4" href="#Examples-4">3.11.2 Examples</a></li> - </ul></li> - <li><a name="toc-libcdio" href="#libcdio">3.12 libcdio</a> - <ul class="no-bullet"> - <li><a name="toc-Options-11" href="#Options-11">3.12.1 Options</a></li> - </ul></li> - <li><a name="toc-libdc1394" href="#libdc1394">3.13 libdc1394</a></li> - <li><a name="toc-openal" href="#openal">3.14 openal</a> - <ul class="no-bullet"> - <li><a name="toc-Options-12" href="#Options-12">3.14.1 Options</a></li> - <li><a name="toc-Examples-5" href="#Examples-5">3.14.2 Examples</a></li> - </ul></li> - <li><a name="toc-oss" href="#oss">3.15 oss</a> - <ul class="no-bullet"> - <li><a name="toc-Options-13" href="#Options-13">3.15.1 Options</a></li> - </ul></li> - <li><a name="toc-pulse" href="#pulse">3.16 pulse</a> - <ul class="no-bullet"> - <li><a name="toc-Options-14" href="#Options-14">3.16.1 Options</a></li> - <li><a name="toc-Examples-6" href="#Examples-6">3.16.2 Examples</a></li> - </ul></li> - <li><a name="toc-qtkit" href="#qtkit">3.17 qtkit</a> - <ul class="no-bullet"> - <li><a name="toc-Options-15" href="#Options-15">3.17.1 Options</a></li> - </ul></li> - <li><a name="toc-sndio" href="#sndio">3.18 sndio</a> - <ul class="no-bullet"> - <li><a name="toc-Options-16" href="#Options-16">3.18.1 Options</a></li> - </ul></li> - <li><a name="toc-video4linux2_002c-v4l2" href="#video4linux2_002c-v4l2">3.19 video4linux2, v4l2</a> - <ul class="no-bullet"> - <li><a name="toc-Options-17" href="#Options-17">3.19.1 Options</a></li> - </ul></li> - <li><a name="toc-vfwcap" href="#vfwcap">3.20 vfwcap</a> - <ul class="no-bullet"> - <li><a name="toc-Options-18" href="#Options-18">3.20.1 Options</a></li> - </ul></li> - <li><a name="toc-x11grab" href="#x11grab">3.21 x11grab</a> - <ul class="no-bullet"> - <li><a name="toc-Options-19" href="#Options-19">3.21.1 Options</a></li> - </ul></li> - </ul></li> - <li><a name="toc-Output-Devices" href="#Output-Devices">4 Output Devices</a> - <ul class="no-bullet"> - <li><a name="toc-alsa-1" href="#alsa-1">4.1 alsa</a> - <ul class="no-bullet"> - <li><a name="toc-Examples-7" href="#Examples-7">4.1.1 Examples</a></li> - </ul></li> - <li><a name="toc-caca" href="#caca">4.2 caca</a> - <ul class="no-bullet"> - <li><a name="toc-Options-20" href="#Options-20">4.2.1 Options</a></li> - <li><a name="toc-Examples-8" href="#Examples-8">4.2.2 Examples</a></li> - </ul></li> - <li><a name="toc-decklink-1" href="#decklink-1">4.3 decklink</a> - <ul class="no-bullet"> - <li><a name="toc-Options-21" href="#Options-21">4.3.1 Options</a></li> - <li><a name="toc-Examples-9" href="#Examples-9">4.3.2 Examples</a></li> - </ul></li> - <li><a name="toc-fbdev-1" href="#fbdev-1">4.4 fbdev</a> - <ul class="no-bullet"> - <li><a name="toc-Options-22" href="#Options-22">4.4.1 Options</a></li> - <li><a name="toc-Examples-10" href="#Examples-10">4.4.2 Examples</a></li> - </ul></li> - <li><a name="toc-opengl" href="#opengl">4.5 opengl</a> - <ul class="no-bullet"> - <li><a name="toc-Options-23" href="#Options-23">4.5.1 Options</a></li> - <li><a name="toc-Examples-11" href="#Examples-11">4.5.2 Examples</a></li> - </ul></li> - <li><a name="toc-oss-1" href="#oss-1">4.6 oss</a></li> - <li><a name="toc-pulse-1" href="#pulse-1">4.7 pulse</a> - <ul class="no-bullet"> - <li><a name="toc-Options-24" href="#Options-24">4.7.1 Options</a></li> - <li><a name="toc-Examples-12" href="#Examples-12">4.7.2 Examples</a></li> - </ul></li> - <li><a name="toc-sdl" href="#sdl">4.8 sdl</a> - <ul class="no-bullet"> - <li><a name="toc-Options-25" href="#Options-25">4.8.1 Options</a></li> - <li><a name="toc-Interactive-commands" href="#Interactive-commands">4.8.2 Interactive commands</a></li> - <li><a name="toc-Examples-13" href="#Examples-13">4.8.3 Examples</a></li> - </ul></li> - <li><a name="toc-sndio-1" href="#sndio-1">4.9 sndio</a></li> - <li><a name="toc-xv" href="#xv">4.10 xv</a> - <ul class="no-bullet"> - <li><a name="toc-Options-26" href="#Options-26">4.10.1 Options</a></li> - <li><a name="toc-Examples-14" href="#Examples-14">4.10.2 Examples</a></li> - </ul></li> - </ul></li> - <li><a name="toc-See-Also" href="#See-Also">5 See Also</a></li> - <li><a name="toc-Authors" href="#Authors">6 Authors</a></li> -</ul> -</div> - - -<a name="Description"></a> -<h2 class="chapter">1 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description" aria-hidden="true">TOC</a></span></h2> - -<p>This document describes the input and output devices provided by the -libavdevice library. -</p> - -<a name="Device-Options"></a> -<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> - -<p>The libavdevice library provides the same interface as -libavformat. Namely, an input device is considered like a demuxer, and -an output device like a muxer, and the interface and generic device -options are the same provided by libavformat (see the ffmpeg-formats -manual). -</p> -<p>In addition each input or output device may support so-called private -options, which are specific for that component. -</p> -<p>Options may be set by specifying -<var>option</var> <var>value</var> in the -FFmpeg tools, or by setting the value explicitly in the device -<code>AVFormatContext</code> options or using the <samp>libavutil/opt.h</samp> API -for programmatic use. -</p> - -<a name="Input-Devices"></a> -<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> - -<p>Input devices are configured elements in FFmpeg which enable accessing -the data coming from a multimedia device attached to your system. -</p> -<p>When you configure your FFmpeg build, all the supported input devices -are enabled by default. You can list all available ones using the -configure option "–list-indevs". -</p> -<p>You can disable all the input devices using the configure option -"–disable-indevs", and selectively enable an input device using the -option "–enable-indev=<var>INDEV</var>", or you can disable a particular -input device using the option "–disable-indev=<var>INDEV</var>". -</p> -<p>The option "-devices" of the ff* tools will display the list of -supported input devices. -</p> -<p>A description of the currently available input devices follows. -</p> -<a name="alsa"></a> -<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> - -<p>ALSA (Advanced Linux Sound Architecture) input device. -</p> -<p>To enable this input device during configuration you need libasound -installed on your system. -</p> -<p>This device allows capturing from an ALSA device. The name of the -device to capture has to be an ALSA card identifier. -</p> -<p>An ALSA identifier has the syntax: -</p><div class="example"> -<pre class="example">hw:<var>CARD</var>[,<var>DEV</var>[,<var>SUBDEV</var>]] -</pre></div> - -<p>where the <var>DEV</var> and <var>SUBDEV</var> components are optional. -</p> -<p>The three arguments (in order: <var>CARD</var>,<var>DEV</var>,<var>SUBDEV</var>) -specify card number or identifier, device number and subdevice number -(-1 means any). -</p> -<p>To see the list of cards currently recognized by your system check the -files <samp>/proc/asound/cards</samp> and <samp>/proc/asound/devices</samp>. -</p> -<p>For example to capture with <code>ffmpeg</code> from an ALSA device with -card id 0, you may run the command: -</p><div class="example"> -<pre class="example">ffmpeg -f alsa -i hw:0 alsaout.wav -</pre></div> - -<p>For more information see: -<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> -</p> -<a name="Options"></a> -<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> - -<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="avfoundation"></a> -<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> - -<p>AVFoundation input device. -</p> -<p>AVFoundation is the currently recommended framework by Apple for streamgrabbing on OSX >= 10.7 as well as on iOS. -The older QTKit framework has been marked deprecated since OSX version 10.7. -</p> -<p>The input filename has to be given in the following syntax: -</p><div class="example"> -<pre class="example">-i "[[VIDEO]:[AUDIO]]" -</pre></div> -<p>The first entry selects the video input while the latter selects the audio input. -The stream has to be specified by the device name or the device index as shown by the device list. -Alternatively, the video and/or audio input device can be chosen by index using the -<samp> - -video_device_index <INDEX> -</samp> -and/or -<samp> - -audio_device_index <INDEX> -</samp> -, overriding any -device name or index given in the input filename. -</p> -<p>All available devices can be enumerated by using <samp>-list_devices true</samp>, listing -all device names and corresponding indices. -</p> -<p>There are two device name aliases: -</p><dl compact="compact"> -<dt><code>default</code></dt> -<dd><p>Select the AVFoundation default device of the corresponding type. -</p> -</dd> -<dt><code>none</code></dt> -<dd><p>Do not record the corresponding media type. -This is equivalent to specifying an empty device name or index. -</p> -</dd> -</dl> - -<a name="Options-1"></a> -<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> - -<p>AVFoundation supports the following options: -</p> -<dl compact="compact"> -<dt><samp>-list_devices <TRUE|FALSE></samp></dt> -<dd><p>If set to true, a list of all available input devices is given showing all -device names and indices. -</p> -</dd> -<dt><samp>-video_device_index <INDEX></samp></dt> -<dd><p>Specify the video device by its index. Overrides anything given in the input filename. -</p> -</dd> -<dt><samp>-audio_device_index <INDEX></samp></dt> -<dd><p>Specify the audio device by its index. Overrides anything given in the input filename. -</p> -</dd> -<dt><samp>-pixel_format <FORMAT></samp></dt> -<dd><p>Request the video device to use a specific pixel format. -If the specified format is not supported, a list of available formats is given -and the first one in this list is used instead. Available pixel formats are: -<code>monob, rgb555be, rgb555le, rgb565be, rgb565le, rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0, - bgr48be, uyvy422, yuva444p, yuva444p16le, yuv444p, yuv422p16, yuv422p10, yuv444p10, - yuv420p, nv12, yuyv422, gray</code> -</p> -</dd> -<dt><samp>-framerate</samp></dt> -<dd><p>Set the grabbing frame rate. Default is <code>ntsc</code>, corresponding to a -frame rate of <code>30000/1001</code>. -</p> -</dd> -<dt><samp>-video_size</samp></dt> -<dd><p>Set the video frame size. -</p> -</dd> -<dt><samp>-capture_cursor</samp></dt> -<dd><p>Capture the mouse pointer. Default is 0. -</p> -</dd> -<dt><samp>-capture_mouse_clicks</samp></dt> -<dd><p>Capture the screen mouse clicks. Default is 0. -</p> -</dd> -</dl> - -<a name="Examples"></a> -<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> - -<ul> -<li> Print the list of AVFoundation supported devices and exit: -<div class="example"> -<pre class="example">$ ffmpeg -f avfoundation -list_devices true -i "" -</pre></div> - -</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> |