forked from KolibriOS/kolibrios
1209 lines
39 KiB
Groff
1209 lines
39 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
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.\" ========================================================================
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.\"
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.IX Title "FFMPEG-DEVICES 1"
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.TH FFMPEG-DEVICES 1 "2013-12-14" " " " "
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.SH "NAME"
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ffmpeg\-devices \- FFmpeg devices
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.SH "DESCRIPTION"
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|
.IX Header "DESCRIPTION"
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|
This document describes the input and output devices provided by the
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libavdevice library.
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.SH "DEVICE OPTIONS"
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|
.IX Header "DEVICE OPTIONS"
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The libavdevice library provides the same interface as
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libavformat. Namely, an input device is considered like a demuxer, and
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an output device like a muxer, and the interface and generic device
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options are the same provided by libavformat (see the ffmpeg-formats
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manual).
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.PP
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|
In addition each input or output device may support so-called private
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|
options, which are specific for that component.
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.PP
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|
Options may be set by specifying \-\fIoption\fR \fIvalue\fR in the
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|
FFmpeg tools, or by setting the value explicitly in the device
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|
\&\f(CW\*(C`AVFormatContext\*(C'\fR options or using the \fIlibavutil/opt.h\fR \s-1API\s0
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|
for programmatic use.
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.SH "INPUT DEVICES"
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|
.IX Header "INPUT DEVICES"
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|
Input devices are configured elements in FFmpeg which allow to access
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|
the data coming from a multimedia device attached to your system.
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.PP
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|
When you configure your FFmpeg build, all the supported input devices
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|
are enabled by default. You can list all available ones using the
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|
configure option \*(L"\-\-list\-indevs\*(R".
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.PP
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|
You can disable all the input devices using the configure option
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|
\&\*(L"\-\-disable\-indevs\*(R", and selectively enable an input device using the
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|
option "\-\-enable\-indev=\fI\s-1INDEV\s0\fR\*(L", or you can disable a particular
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|
input device using the option \*(R"\-\-disable\-indev=\fI\s-1INDEV\s0\fR".
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.PP
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|
The option \*(L"\-formats\*(R" of the ff* tools will display the list of
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|
supported input devices (amongst the demuxers).
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.PP
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|
A description of the currently available input devices follows.
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|
.Sh "alsa"
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|
.IX Subsection "alsa"
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|
\&\s-1ALSA\s0 (Advanced Linux Sound Architecture) input device.
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|
.PP
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|
To enable this input device during configuration you need libasound
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|
installed on your system.
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.PP
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|
This device allows capturing from an \s-1ALSA\s0 device. The name of the
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|
device to capture has to be an \s-1ALSA\s0 card identifier.
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.PP
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|
An \s-1ALSA\s0 identifier has the syntax:
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|
.PP
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|
.Vb 1
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|
\& hw:<CARD>[,<DEV>[,<SUBDEV>]]
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.Ve
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|
.PP
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|
where the \fI\s-1DEV\s0\fR and \fI\s-1SUBDEV\s0\fR components are optional.
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.PP
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|
The three arguments (in order: \fI\s-1CARD\s0\fR,\fI\s-1DEV\s0\fR,\fI\s-1SUBDEV\s0\fR)
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|
specify card number or identifier, device number and subdevice number
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|
(\-1 means any).
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.PP
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|
To see the list of cards currently recognized by your system check the
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|
files \fI/proc/asound/cards\fR and \fI/proc/asound/devices\fR.
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.PP
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|
For example to capture with \fBffmpeg\fR from an \s-1ALSA\s0 device with
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|
card id 0, you may run the command:
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|
.PP
|
|
.Vb 1
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|
\& ffmpeg -f alsa -i hw:0 alsaout.wav
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|
.Ve
|
|
.PP
|
|
For more information see:
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|
<\fBhttp://www.alsa\-project.org/alsa\-doc/alsa\-lib/pcm.html\fR>
|
|
.Sh "bktr"
|
|
.IX Subsection "bktr"
|
|
\&\s-1BSD\s0 video input device.
|
|
.Sh "dshow"
|
|
.IX Subsection "dshow"
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|
Windows DirectShow input device.
|
|
.PP
|
|
DirectShow support is enabled when FFmpeg is built with the mingw\-w64 project.
|
|
Currently only audio and video devices are supported.
|
|
.PP
|
|
Multiple devices may be opened as separate inputs, but they may also be
|
|
opened on the same input, which should improve synchronism between them.
|
|
.PP
|
|
The input name should be in the format:
|
|
.PP
|
|
.Vb 1
|
|
\& <TYPE>=<NAME>[:<TYPE>=<NAME>]
|
|
.Ve
|
|
.PP
|
|
where \fI\s-1TYPE\s0\fR can be either \fIaudio\fR or \fIvideo\fR,
|
|
and \fI\s-1NAME\s0\fR is the device's name.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.PP
|
|
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.
|
|
.IP "\fBvideo_size\fR" 4
|
|
.IX Item "video_size"
|
|
Set the video size in the captured video.
|
|
.IP "\fBframerate\fR" 4
|
|
.IX Item "framerate"
|
|
Set the frame rate in the captured video.
|
|
.IP "\fBsample_rate\fR" 4
|
|
.IX Item "sample_rate"
|
|
Set the sample rate (in Hz) of the captured audio.
|
|
.IP "\fBsample_size\fR" 4
|
|
.IX Item "sample_size"
|
|
Set the sample size (in bits) of the captured audio.
|
|
.IP "\fBchannels\fR" 4
|
|
.IX Item "channels"
|
|
Set the number of channels in the captured audio.
|
|
.IP "\fBlist_devices\fR" 4
|
|
.IX Item "list_devices"
|
|
If set to \fBtrue\fR, print a list of devices and exit.
|
|
.IP "\fBlist_options\fR" 4
|
|
.IX Item "list_options"
|
|
If set to \fBtrue\fR, print a list of selected device's options
|
|
and exit.
|
|
.IP "\fBvideo_device_number\fR" 4
|
|
.IX Item "video_device_number"
|
|
Set video device number for devices with same name (starts at 0,
|
|
defaults to 0).
|
|
.IP "\fBaudio_device_number\fR" 4
|
|
.IX Item "audio_device_number"
|
|
Set audio device number for devices with same name (starts at 0,
|
|
defaults to 0).
|
|
.IP "\fBpixel_format\fR" 4
|
|
.IX Item "pixel_format"
|
|
Select pixel format to be used by DirectShow. This may only be set when
|
|
the video codec is not set or set to rawvideo.
|
|
.IP "\fBaudio_buffer_size\fR" 4
|
|
.IX Item "audio_buffer_size"
|
|
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
|
|
<\fBhttp://msdn.microsoft.com/en\-us/library/windows/desktop/dd377582(v=vs.85).aspx\fR>
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.IP "\(bu" 4
|
|
Print the list of DirectShow supported devices and exit:
|
|
.Sp
|
|
.Vb 1
|
|
\& $ ffmpeg -list_devices true -f dshow -i dummy
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Open video device \fICamera\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& $ ffmpeg -f dshow -i video="Camera"
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Open second video device with name \fICamera\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& $ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Open video device \fICamera\fR and audio device \fIMicrophone\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& $ ffmpeg -f dshow -i video="Camera":audio="Microphone"
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Print the list of supported options in selected device and exit:
|
|
.Sp
|
|
.Vb 1
|
|
\& $ ffmpeg -list_options true -f dshow -i video="Camera"
|
|
.Ve
|
|
.Sh "dv1394"
|
|
.IX Subsection "dv1394"
|
|
Linux \s-1DV\s0 1394 input device.
|
|
.Sh "fbdev"
|
|
.IX Subsection "fbdev"
|
|
Linux framebuffer input device.
|
|
.PP
|
|
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
|
|
\&\fI/dev/fb0\fR.
|
|
.PP
|
|
For more detailed information read the file
|
|
Documentation/fb/framebuffer.txt included in the Linux source tree.
|
|
.PP
|
|
To record from the framebuffer device \fI/dev/fb0\fR with
|
|
\&\fBffmpeg\fR:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f fbdev -r 10 -i /dev/fb0 out.avi
|
|
.Ve
|
|
.PP
|
|
You can take a single screenshot image with the command:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f fbdev -frames:v 1 -r 1 -i /dev/fb0 screenshot.jpeg
|
|
.Ve
|
|
.PP
|
|
See also <\fBhttp://linux\-fbdev.sourceforge.net/\fR>, and \fIfbset\fR\|(1).
|
|
.Sh "iec61883"
|
|
.IX Subsection "iec61883"
|
|
FireWire \s-1DV/HDV\s0 input device using libiec61883.
|
|
.PP
|
|
To enable this input device, you need libiec61883, libraw1394 and
|
|
libavc1394 installed on your system. Use the configure option
|
|
\&\f(CW\*(C`\-\-enable\-libiec61883\*(C'\fR to compile with the device enabled.
|
|
.PP
|
|
The iec61883 capture device supports capturing from a video device
|
|
connected via \s-1IEEE1394\s0 (FireWire), using libiec61883 and the new Linux
|
|
FireWire stack (juju). This is the default \s-1DV/HDV\s0 input method in Linux
|
|
Kernel 2.6.37 and later, since the old FireWire stack was removed.
|
|
.PP
|
|
Specify the FireWire port to be used as input file, or \*(L"auto\*(R"
|
|
to choose the first port connected.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBdvtype\fR" 4
|
|
.IX Item "dvtype"
|
|
Override autodetection of \s-1DV/HDV\s0. This should only be used if auto
|
|
detection does not work, or if usage of a different device type
|
|
should be prohibited. Treating a \s-1DV\s0 device as \s-1HDV\s0 (or vice versa) will
|
|
not work and result in undefined behavior.
|
|
The values \fBauto\fR, \fBdv\fR and \fBhdv\fR are supported.
|
|
.IP "\fBdvbuffer\fR" 4
|
|
.IX Item "dvbuffer"
|
|
Set maxiumum size of buffer for incoming data, in frames. For \s-1DV\s0, this
|
|
is an exact value. For \s-1HDV\s0, it is not frame exact, since \s-1HDV\s0 does
|
|
not have a fixed frame size.
|
|
.IP "\fBdvguid\fR" 4
|
|
.IX Item "dvguid"
|
|
Select the capture device by specifying it's \s-1GUID\s0. Capturing will only
|
|
be performed from the specified device and fails if no device with the
|
|
given \s-1GUID\s0 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.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.IP "\(bu" 4
|
|
Grab and show the input of a FireWire \s-1DV/HDV\s0 device.
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f iec61883 -i auto
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Grab and record the input of a FireWire \s-1DV/HDV\s0 device,
|
|
using a packet buffer of 100000 packets if the source is \s-1HDV\s0.
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -f iec61883 -i auto -hdvbuffer 100000 out.mpg
|
|
.Ve
|
|
.Sh "jack"
|
|
.IX Subsection "jack"
|
|
\&\s-1JACK\s0 input device.
|
|
.PP
|
|
To enable this input device during configuration you need libjack
|
|
installed on your system.
|
|
.PP
|
|
A \s-1JACK\s0 input device creates one or more \s-1JACK\s0 writable clients, one for
|
|
each audio channel, with name \fIclient_name\fR:input_\fIN\fR, where
|
|
\&\fIclient_name\fR is the name provided by the application, and \fIN\fR
|
|
is a number which identifies the channel.
|
|
Each writable client will send the acquired data to the FFmpeg input
|
|
device.
|
|
.PP
|
|
Once you have created one or more \s-1JACK\s0 readable clients, you need to
|
|
connect them to one or more \s-1JACK\s0 writable clients.
|
|
.PP
|
|
To connect or disconnect \s-1JACK\s0 clients you can use the \fBjack_connect\fR
|
|
and \fBjack_disconnect\fR programs, or do it through a graphical interface,
|
|
for example with \fBqjackctl\fR.
|
|
.PP
|
|
To list the \s-1JACK\s0 clients and their properties you can invoke the command
|
|
\&\fBjack_lsp\fR.
|
|
.PP
|
|
Follows an example which shows how to capture a \s-1JACK\s0 readable client
|
|
with \fBffmpeg\fR.
|
|
.PP
|
|
.Vb 2
|
|
\& # Create a JACK writable client with name "ffmpeg".
|
|
\& $ ffmpeg -f jack -i ffmpeg -y out.wav
|
|
.Ve
|
|
.PP
|
|
.Vb 2
|
|
\& # Start the sample jack_metro readable client.
|
|
\& $ jack_metro -b 120 -d 0.2 -f 4000
|
|
.Ve
|
|
.PP
|
|
.Vb 8
|
|
\& # 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
|
|
.Ve
|
|
.PP
|
|
.Vb 2
|
|
\& # Connect metro to the ffmpeg writable client.
|
|
\& $ jack_connect metro:120_bpm ffmpeg:input_1
|
|
.Ve
|
|
.PP
|
|
For more information read:
|
|
<\fBhttp://jackaudio.org/\fR>
|
|
.Sh "lavfi"
|
|
.IX Subsection "lavfi"
|
|
Libavfilter input virtual device.
|
|
.PP
|
|
This input device reads data from the open output pads of a libavfilter
|
|
filtergraph.
|
|
.PP
|
|
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 \fBgraph\fR.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBgraph\fR" 4
|
|
.IX Item "graph"
|
|
Specify the filtergraph to use as input. Each video open output must be
|
|
labelled by a unique string of the form "out\fIN\fR", where \fIN\fR 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 \*(L"out0\*(R"
|
|
label, but all the others need to be specified explicitly.
|
|
.Sp
|
|
If not specified defaults to the filename specified for the input
|
|
device.
|
|
.IP "\fBgraph_file\fR" 4
|
|
.IX Item "graph_file"
|
|
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 \fIgraph\fR.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.IP "\(bu" 4
|
|
Create a color video stream and play it back with \fBffplay\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f lavfi -graph "color=c=pink [out0]" dummy
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
As the previous example, but use filename for specifying the graph
|
|
description, and omit the \*(L"out0\*(R" label:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f lavfi color=c=pink
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Create three different video test filtered sources and play them:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Read an audio stream from a file using the amovie source and play it
|
|
back with \fBffplay\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f lavfi "amovie=test.wav"
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Read an audio stream and a video stream and play it back with
|
|
\&\fBffplay\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"
|
|
.Ve
|
|
.Sh "libdc1394"
|
|
.IX Subsection "libdc1394"
|
|
\&\s-1IIDC1394\s0 input device, based on libdc1394 and libraw1394.
|
|
.Sh "openal"
|
|
.IX Subsection "openal"
|
|
The OpenAL input device provides audio capture on all systems with a
|
|
working OpenAL 1.1 implementation.
|
|
.PP
|
|
To enable this input device during configuration, you need OpenAL
|
|
headers and libraries installed on your system, and need to configure
|
|
FFmpeg with \f(CW\*(C`\-\-enable\-openal\*(C'\fR.
|
|
.PP
|
|
OpenAL headers and libraries should be provided as part of your OpenAL
|
|
implementation, or as an additional download (an \s-1SDK\s0). Depending on your
|
|
installation you may need to specify additional flags via the
|
|
\&\f(CW\*(C`\-\-extra\-cflags\*(C'\fR and \f(CW\*(C`\-\-extra\-ldflags\*(C'\fR for allowing the build
|
|
system to locate the OpenAL headers and libraries.
|
|
.PP
|
|
An incomplete list of OpenAL implementations follows:
|
|
.IP "\fBCreative\fR" 4
|
|
.IX Item "Creative"
|
|
The official Windows implementation, providing hardware acceleration
|
|
with supported devices and software fallback.
|
|
See <\fBhttp://openal.org/\fR>.
|
|
.IP "\fBOpenAL Soft\fR" 4
|
|
.IX Item "OpenAL Soft"
|
|
Portable, open source (\s-1LGPL\s0) software implementation. Includes
|
|
backends for the most common sound APIs on the Windows, Linux,
|
|
Solaris, and \s-1BSD\s0 operating systems.
|
|
See <\fBhttp://kcat.strangesoft.net/openal.html\fR>.
|
|
.IP "\fBApple\fR" 4
|
|
.IX Item "Apple"
|
|
OpenAL is part of Core Audio, the official Mac \s-1OS\s0 X Audio interface.
|
|
See <\fBhttp://developer.apple.com/technologies/mac/audio\-and\-video.html\fR>
|
|
.PP
|
|
This device allows to capture from an audio input device handled
|
|
through OpenAL.
|
|
.PP
|
|
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 \fIlist_devices\fR.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBchannels\fR" 4
|
|
.IX Item "channels"
|
|
Set the number of channels in the captured audio. Only the values
|
|
\&\fB1\fR (monaural) and \fB2\fR (stereo) are currently supported.
|
|
Defaults to \fB2\fR.
|
|
.IP "\fBsample_size\fR" 4
|
|
.IX Item "sample_size"
|
|
Set the sample size (in bits) of the captured audio. Only the values
|
|
\&\fB8\fR and \fB16\fR are currently supported. Defaults to
|
|
\&\fB16\fR.
|
|
.IP "\fBsample_rate\fR" 4
|
|
.IX Item "sample_rate"
|
|
Set the sample rate (in Hz) of the captured audio.
|
|
Defaults to \fB44.1k\fR.
|
|
.IP "\fBlist_devices\fR" 4
|
|
.IX Item "list_devices"
|
|
If set to \fBtrue\fR, print a list of devices and exit.
|
|
Defaults to \fBfalse\fR.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.PP
|
|
Print the list of OpenAL supported devices and exit:
|
|
.PP
|
|
.Vb 1
|
|
\& $ ffmpeg -list_devices true -f openal -i dummy out.ogg
|
|
.Ve
|
|
.PP
|
|
Capture from the OpenAL device \fI\s-1DR\-BT101\s0 via PulseAudio\fR:
|
|
.PP
|
|
.Vb 1
|
|
\& $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg
|
|
.Ve
|
|
.PP
|
|
Capture from the default device (note the empty string '' as filename):
|
|
.PP
|
|
.Vb 1
|
|
\& $ ffmpeg -f openal -i '' out.ogg
|
|
.Ve
|
|
.PP
|
|
Capture from two devices simultaneously, writing to two different files,
|
|
within the same \fBffmpeg\fR command:
|
|
.PP
|
|
.Vb 1
|
|
\& $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg
|
|
.Ve
|
|
.PP
|
|
Note: not all OpenAL implementations support multiple simultaneous capture \-
|
|
try the latest OpenAL Soft if the above does not work.
|
|
.Sh "oss"
|
|
.IX Subsection "oss"
|
|
Open Sound System input device.
|
|
.PP
|
|
The filename to provide to the input device is the device node
|
|
representing the \s-1OSS\s0 input device, and is usually set to
|
|
\&\fI/dev/dsp\fR.
|
|
.PP
|
|
For example to grab from \fI/dev/dsp\fR using \fBffmpeg\fR use the
|
|
command:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
|
|
.Ve
|
|
.PP
|
|
For more information about \s-1OSS\s0 see:
|
|
<\fBhttp://manuals.opensound.com/usersguide/dsp.html\fR>
|
|
.Sh "pulse"
|
|
.IX Subsection "pulse"
|
|
PulseAudio input device.
|
|
.PP
|
|
To enable this output device you need to configure FFmpeg with \f(CW\*(C`\-\-enable\-libpulse\*(C'\fR.
|
|
.PP
|
|
The filename to provide to the input device is a source device or the
|
|
string \*(L"default\*(R"
|
|
.PP
|
|
To list the PulseAudio source devices and their properties you can invoke
|
|
the command \fBpactl list sources\fR.
|
|
.PP
|
|
More information about PulseAudio can be found on <\fBhttp://www.pulseaudio.org\fR>.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBserver\fR" 4
|
|
.IX Item "server"
|
|
Connect to a specific PulseAudio server, specified by an \s-1IP\s0 address.
|
|
Default server is used when not provided.
|
|
.IP "\fBname\fR" 4
|
|
.IX Item "name"
|
|
Specify the application name PulseAudio will use when showing active clients,
|
|
by default it is the \f(CW\*(C`LIBAVFORMAT_IDENT\*(C'\fR string.
|
|
.IP "\fBstream_name\fR" 4
|
|
.IX Item "stream_name"
|
|
Specify the stream name PulseAudio will use when showing active streams,
|
|
by default it is \*(L"record\*(R".
|
|
.IP "\fBsample_rate\fR" 4
|
|
.IX Item "sample_rate"
|
|
Specify the samplerate in Hz, by default 48kHz is used.
|
|
.IP "\fBchannels\fR" 4
|
|
.IX Item "channels"
|
|
Specify the channels in use, by default 2 (stereo) is set.
|
|
.IP "\fBframe_size\fR" 4
|
|
.IX Item "frame_size"
|
|
Specify the number of bytes per frame, by default it is set to 1024.
|
|
.IP "\fBfragment_size\fR" 4
|
|
.IX Item "fragment_size"
|
|
Specify the minimal buffering fragment in PulseAudio, it will affect the
|
|
audio latency. By default it is unset.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.PP
|
|
Record a stream from default device:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f pulse -i default /tmp/pulse.wav
|
|
.Ve
|
|
.Sh "sndio"
|
|
.IX Subsection "sndio"
|
|
sndio input device.
|
|
.PP
|
|
To enable this input device during configuration you need libsndio
|
|
installed on your system.
|
|
.PP
|
|
The filename to provide to the input device is the device node
|
|
representing the sndio input device, and is usually set to
|
|
\&\fI/dev/audio0\fR.
|
|
.PP
|
|
For example to grab from \fI/dev/audio0\fR using \fBffmpeg\fR use the
|
|
command:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
|
|
.Ve
|
|
.Sh "video4linux2, v4l2"
|
|
.IX Subsection "video4linux2, v4l2"
|
|
Video4Linux2 input video device.
|
|
.PP
|
|
\&\*(L"v4l2\*(R" can be used as alias for \*(L"video4linux2\*(R".
|
|
.PP
|
|
If FFmpeg is built with v4l\-utils support (by using the
|
|
\&\f(CW\*(C`\-\-enable\-libv4l2\*(C'\fR configure option), it is possible to use it with the
|
|
\&\f(CW\*(C`\-use_libv4l2\*(C'\fR input device option.
|
|
.PP
|
|
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 \s-1USB\s0 webcam) is plugged into the system, and has a name of the
|
|
kind \fI/dev/video\fIN\fI\fR, where \fIN\fR is a number associated to
|
|
the device.
|
|
.PP
|
|
Video4Linux2 devices usually support a limited set of
|
|
\&\fIwidth\fRx\fIheight\fR sizes and frame rates. You can check which are
|
|
supported using \fB\-list_formats all\fR for Video4Linux2 devices.
|
|
Some devices, like \s-1TV\s0 cards, support one or more standards. It is possible
|
|
to list all the supported standards using \fB\-list_standards all\fR.
|
|
.PP
|
|
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 \s-1NTP\s0 or manual changes to the clock). The
|
|
\&\fB\-timestamps abs\fR or \fB\-ts abs\fR option can be used to force
|
|
conversion into the real time clock.
|
|
.PP
|
|
Some usage examples of the video4linux2 device with \fBffmpeg\fR
|
|
and \fBffplay\fR:
|
|
.IP "\(bu" 4
|
|
Grab and show the input of a video4linux2 device:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Grab and record the input of a video4linux2 device, leave the
|
|
frame rate and size as previously set:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
|
|
.Ve
|
|
.PP
|
|
For more information about Video4Linux, check <\fBhttp://linuxtv.org/\fR>.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBstandard\fR" 4
|
|
.IX Item "standard"
|
|
Set the standard. Must be the name of a supported standard. To get a
|
|
list of the supported standards, use the \fBlist_standards\fR
|
|
option.
|
|
.IP "\fBchannel\fR" 4
|
|
.IX Item "channel"
|
|
Set the input channel number. Default to \-1, which means using the
|
|
previously selected channel.
|
|
.IP "\fBvideo_size\fR" 4
|
|
.IX Item "video_size"
|
|
Set the video frame size. The argument must be a string in the form
|
|
\&\fI\s-1WIDTH\s0\fRx\fI\s-1HEIGHT\s0\fR or a valid size abbreviation.
|
|
.IP "\fBpixel_format\fR" 4
|
|
.IX Item "pixel_format"
|
|
Select the pixel format (only valid for raw video input).
|
|
.IP "\fBinput_format\fR" 4
|
|
.IX Item "input_format"
|
|
Set the preferred pixel format (for raw video) or a codec name.
|
|
This option allows to select the input format, when several are
|
|
available.
|
|
.IP "\fBframerate\fR" 4
|
|
.IX Item "framerate"
|
|
Set the preferred video frame rate.
|
|
.IP "\fBlist_formats\fR" 4
|
|
.IX Item "list_formats"
|
|
List available formats (supported pixel formats, codecs, and frame
|
|
sizes) and exit.
|
|
.Sp
|
|
Available values are:
|
|
.RS 4
|
|
.IP "\fBall\fR" 4
|
|
.IX Item "all"
|
|
Show all available (compressed and non\-compressed) formats.
|
|
.IP "\fBraw\fR" 4
|
|
.IX Item "raw"
|
|
Show only raw video (non\-compressed) formats.
|
|
.IP "\fBcompressed\fR" 4
|
|
.IX Item "compressed"
|
|
Show only compressed formats.
|
|
.RE
|
|
.RS 4
|
|
.RE
|
|
.IP "\fBlist_standards\fR" 4
|
|
.IX Item "list_standards"
|
|
List supported standards and exit.
|
|
.Sp
|
|
Available values are:
|
|
.RS 4
|
|
.IP "\fBall\fR" 4
|
|
.IX Item "all"
|
|
Show all supported standards.
|
|
.RE
|
|
.RS 4
|
|
.RE
|
|
.IP "\fBtimestamps, ts\fR" 4
|
|
.IX Item "timestamps, ts"
|
|
Set type of timestamps for grabbed frames.
|
|
.Sp
|
|
Available values are:
|
|
.RS 4
|
|
.IP "\fBdefault\fR" 4
|
|
.IX Item "default"
|
|
Use timestamps from the kernel.
|
|
.IP "\fBabs\fR" 4
|
|
.IX Item "abs"
|
|
Use absolute timestamps (wall clock).
|
|
.IP "\fBmono2abs\fR" 4
|
|
.IX Item "mono2abs"
|
|
Force conversion from monotonic to absolute timestamps.
|
|
.RE
|
|
.RS 4
|
|
.Sp
|
|
Default value is \f(CW\*(C`default\*(C'\fR.
|
|
.RE
|
|
.Sh "vfwcap"
|
|
.IX Subsection "vfwcap"
|
|
VfW (Video for Windows) capture input device.
|
|
.PP
|
|
The filename passed as input is the capture driver number, ranging from
|
|
0 to 9. You may use \*(L"list\*(R" as filename to print a list of drivers. Any
|
|
other filename will be interpreted as device number 0.
|
|
.Sh "x11grab"
|
|
.IX Subsection "x11grab"
|
|
X11 video input device.
|
|
.PP
|
|
This device allows to capture a region of an X11 display.
|
|
.PP
|
|
The filename passed as input has the syntax:
|
|
.PP
|
|
.Vb 1
|
|
\& [<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>]
|
|
.Ve
|
|
.PP
|
|
\&\fIhostname\fR:\fIdisplay_number\fR.\fIscreen_number\fR specifies the
|
|
X11 display name of the screen to grab from. \fIhostname\fR can be
|
|
omitted, and defaults to \*(L"localhost\*(R". The environment variable
|
|
\&\fB\s-1DISPLAY\s0\fR contains the default display name.
|
|
.PP
|
|
\&\fIx_offset\fR and \fIy_offset\fR specify the offsets of the grabbed
|
|
area with respect to the top-left border of the X11 screen. They
|
|
default to 0.
|
|
.PP
|
|
Check the X11 documentation (e.g. man X) for more detailed information.
|
|
.PP
|
|
Use the \fBdpyinfo\fR program for getting basic information about the
|
|
properties of your X11 display (e.g. grep for \*(L"name\*(R" or \*(L"dimensions\*(R").
|
|
.PP
|
|
For example to grab from \fI:0.0\fR using \fBffmpeg\fR:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
.Ve
|
|
.PP
|
|
Grab at position \f(CW\*(C`10,20\*(C'\fR:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
|
|
.Ve
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBdraw_mouse\fR" 4
|
|
.IX Item "draw_mouse"
|
|
Specify whether to draw the mouse pointer. A value of \f(CW0\fR specify
|
|
not to draw the pointer. Default value is \f(CW1\fR.
|
|
.IP "\fBfollow_mouse\fR" 4
|
|
.IX Item "follow_mouse"
|
|
Make the grabbed area follow the mouse. The argument can be
|
|
\&\f(CW\*(C`centered\*(C'\fR or a number of pixels \fI\s-1PIXELS\s0\fR.
|
|
.Sp
|
|
When it is specified with \*(L"centered\*(R", 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 \fI\s-1PIXELS\s0\fR (greater than
|
|
zero) to the edge of region.
|
|
.Sp
|
|
For example:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
.Ve
|
|
.Sp
|
|
To follow only when the mouse pointer reaches within 100 pixels to edge:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
.Ve
|
|
.IP "\fBframerate\fR" 4
|
|
.IX Item "framerate"
|
|
Set the grabbing frame rate. Default value is \f(CW\*(C`ntsc\*(C'\fR,
|
|
corresponding to a frame rate of \f(CW\*(C`30000/1001\*(C'\fR.
|
|
.IP "\fBshow_region\fR" 4
|
|
.IX Item "show_region"
|
|
Show grabbed region on screen.
|
|
.Sp
|
|
If \fIshow_region\fR is specified with \f(CW1\fR, 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.
|
|
.Sp
|
|
For example:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
|
|
.Ve
|
|
.Sp
|
|
With \fIfollow_mouse\fR:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
.Ve
|
|
.IP "\fBvideo_size\fR" 4
|
|
.IX Item "video_size"
|
|
Set the video frame size. Default value is \f(CW\*(C`vga\*(C'\fR.
|
|
.SH "OUTPUT DEVICES"
|
|
.IX Header "OUTPUT DEVICES"
|
|
Output devices are configured elements in FFmpeg that can write
|
|
multimedia data to an output device attached to your system.
|
|
.PP
|
|
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 \*(L"\-\-list\-outdevs\*(R".
|
|
.PP
|
|
You can disable all the output devices using the configure option
|
|
\&\*(L"\-\-disable\-outdevs\*(R", and selectively enable an output device using the
|
|
option "\-\-enable\-outdev=\fI\s-1OUTDEV\s0\fR\*(L", or you can disable a particular
|
|
input device using the option \*(R"\-\-disable\-outdev=\fI\s-1OUTDEV\s0\fR".
|
|
.PP
|
|
The option \*(L"\-formats\*(R" of the ff* tools will display the list of
|
|
enabled output devices (amongst the muxers).
|
|
.PP
|
|
A description of the currently available output devices follows.
|
|
.Sh "alsa"
|
|
.IX Subsection "alsa"
|
|
\&\s-1ALSA\s0 (Advanced Linux Sound Architecture) output device.
|
|
.Sh "caca"
|
|
.IX Subsection "caca"
|
|
\&\s-1CACA\s0 output device.
|
|
.PP
|
|
This output device allows to show a video stream in \s-1CACA\s0 window.
|
|
Only one \s-1CACA\s0 window is allowed per application, so you can
|
|
have only one instance of this output device in an application.
|
|
.PP
|
|
To enable this output device you need to configure FFmpeg with
|
|
\&\f(CW\*(C`\-\-enable\-libcaca\*(C'\fR.
|
|
libcaca is a graphics library that outputs text instead of pixels.
|
|
.PP
|
|
For more information about libcaca, check:
|
|
<\fBhttp://caca.zoy.org/wiki/libcaca\fR>
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBwindow_title\fR" 4
|
|
.IX Item "window_title"
|
|
Set the \s-1CACA\s0 window title, if not specified default to the filename
|
|
specified for the output device.
|
|
.IP "\fBwindow_size\fR" 4
|
|
.IX Item "window_size"
|
|
Set the \s-1CACA\s0 window size, can be a string of the form
|
|
\&\fIwidth\fRx\fIheight\fR or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video.
|
|
.IP "\fBdriver\fR" 4
|
|
.IX Item "driver"
|
|
Set display driver.
|
|
.IP "\fBalgorithm\fR" 4
|
|
.IX Item "algorithm"
|
|
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 \f(CW\*(C`\-list_dither algorithms\*(C'\fR.
|
|
.IP "\fBantialias\fR" 4
|
|
.IX Item "antialias"
|
|
Set antialias method. Antialiasing smoothens the rendered
|
|
image and avoids the commonly seen staircase effect.
|
|
The accepted values are listed with \f(CW\*(C`\-list_dither antialiases\*(C'\fR.
|
|
.IP "\fBcharset\fR" 4
|
|
.IX Item "charset"
|
|
Set which characters are going to be used when rendering text.
|
|
The accepted values are listed with \f(CW\*(C`\-list_dither charsets\*(C'\fR.
|
|
.IP "\fBcolor\fR" 4
|
|
.IX Item "color"
|
|
Set color to be used when rendering text.
|
|
The accepted values are listed with \f(CW\*(C`\-list_dither colors\*(C'\fR.
|
|
.IP "\fBlist_drivers\fR" 4
|
|
.IX Item "list_drivers"
|
|
If set to \fBtrue\fR, print a list of available drivers and exit.
|
|
.IP "\fBlist_dither\fR" 4
|
|
.IX Item "list_dither"
|
|
List available dither options related to the argument.
|
|
The argument must be one of \f(CW\*(C`algorithms\*(C'\fR, \f(CW\*(C`antialiases\*(C'\fR,
|
|
\&\f(CW\*(C`charsets\*(C'\fR, \f(CW\*(C`colors\*(C'\fR.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.IP "\(bu" 4
|
|
The following command shows the \fBffmpeg\fR output is an
|
|
\&\s-1CACA\s0 window, forcing its size to 80x25:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT -vcodec rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Show the list of available drivers and exit:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Show the list of available dither colors and exit:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
|
|
.Ve
|
|
.Sh "fbdev"
|
|
.IX Subsection "fbdev"
|
|
Linux framebuffer output device.
|
|
.PP
|
|
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
|
|
\&\fI/dev/fb0\fR.
|
|
.PP
|
|
For more detailed information read the file
|
|
\&\fIDocumentation/fb/framebuffer.txt\fR included in the Linux source tree.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBxoffset\fR" 4
|
|
.IX Item "xoffset"
|
|
.PD 0
|
|
.IP "\fByoffset\fR" 4
|
|
.IX Item "yoffset"
|
|
.PD
|
|
Set x/y coordinate of top left corner. Default is 0.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.PP
|
|
Play a file on framebuffer device \fI/dev/fb0\fR.
|
|
Required pixel format depends on current framebuffer settings.
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -re -i INPUT -vcodec rawvideo -pix_fmt bgra -f fbdev /dev/fb0
|
|
.Ve
|
|
.PP
|
|
See also <\fBhttp://linux\-fbdev.sourceforge.net/\fR>, and \fIfbset\fR\|(1).
|
|
.Sh "oss"
|
|
.IX Subsection "oss"
|
|
\&\s-1OSS\s0 (Open Sound System) output device.
|
|
.Sh "pulse"
|
|
.IX Subsection "pulse"
|
|
PulseAudio output device.
|
|
.PP
|
|
To enable this output device you need to configure FFmpeg with \f(CW\*(C`\-\-enable\-libpulse\*(C'\fR.
|
|
.PP
|
|
More information about PulseAudio can be found on <\fBhttp://www.pulseaudio.org\fR>
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBserver\fR" 4
|
|
.IX Item "server"
|
|
Connect to a specific PulseAudio server, specified by an \s-1IP\s0 address.
|
|
Default server is used when not provided.
|
|
.IP "\fBname\fR" 4
|
|
.IX Item "name"
|
|
Specify the application name PulseAudio will use when showing active clients,
|
|
by default it is the \f(CW\*(C`LIBAVFORMAT_IDENT\*(C'\fR string.
|
|
.IP "\fBstream_name\fR" 4
|
|
.IX Item "stream_name"
|
|
Specify the stream name PulseAudio will use when showing active streams,
|
|
by default it is set to the specified output name.
|
|
.IP "\fBdevice\fR" 4
|
|
.IX Item "device"
|
|
Specify the device to use. Default device is used when not provided.
|
|
List of output devices can be obtained with command \fBpactl list sinks\fR.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.PP
|
|
Play a file on default device on default server:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT -f pulse "stream name"
|
|
.Ve
|
|
.Sh "sdl"
|
|
.IX Subsection "sdl"
|
|
\&\s-1SDL\s0 (Simple DirectMedia Layer) output device.
|
|
.PP
|
|
This output device allows to show a video stream in an \s-1SDL\s0
|
|
window. Only one \s-1SDL\s0 window is allowed per application, so you can
|
|
have only one instance of this output device in an application.
|
|
.PP
|
|
To enable this output device you need libsdl installed on your system
|
|
when configuring your build.
|
|
.PP
|
|
For more information about \s-1SDL\s0, check:
|
|
<\fBhttp://www.libsdl.org/\fR>
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBwindow_title\fR" 4
|
|
.IX Item "window_title"
|
|
Set the \s-1SDL\s0 window title, if not specified default to the filename
|
|
specified for the output device.
|
|
.IP "\fBicon_title\fR" 4
|
|
.IX Item "icon_title"
|
|
Set the name of the iconified \s-1SDL\s0 window, if not specified it is set
|
|
to the same value of \fIwindow_title\fR.
|
|
.IP "\fBwindow_size\fR" 4
|
|
.IX Item "window_size"
|
|
Set the \s-1SDL\s0 window size, can be a string of the form
|
|
\&\fIwidth\fRx\fIheight\fR or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video,
|
|
downscaled according to the aspect ratio.
|
|
.IP "\fBwindow_fullscreen\fR" 4
|
|
.IX Item "window_fullscreen"
|
|
Set fullscreen mode when non-zero value is provided.
|
|
Zero is a default.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.PP
|
|
The following command shows the \fBffmpeg\fR output is an
|
|
\&\s-1SDL\s0 window, forcing its size to the qcif format:
|
|
.PP
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT -vcodec rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL output"
|
|
.Ve
|
|
.Sh "sndio"
|
|
.IX Subsection "sndio"
|
|
sndio audio output device.
|
|
.Sh "xv"
|
|
.IX Subsection "xv"
|
|
\&\s-1XV\s0 (XVideo) output device.
|
|
.PP
|
|
This output device allows to show a video stream in a X Window System
|
|
window.
|
|
.PP
|
|
\fIOptions\fR
|
|
.IX Subsection "Options"
|
|
.IP "\fBdisplay_name\fR" 4
|
|
.IX Item "display_name"
|
|
Specify the hardware display name, which determines the display and
|
|
communications domain to be used.
|
|
.Sp
|
|
The display name or \s-1DISPLAY\s0 environment variable can be a string in
|
|
the format \fIhostname\fR[:\fInumber\fR[.\fIscreen_number\fR]].
|
|
.Sp
|
|
\&\fIhostname\fR specifies the name of the host machine on which the
|
|
display is physically attached. \fInumber\fR specifies the number of
|
|
the display server on that host machine. \fIscreen_number\fR specifies
|
|
the screen to be used on that server.
|
|
.Sp
|
|
If unspecified, it defaults to the value of the \s-1DISPLAY\s0 environment
|
|
variable.
|
|
.Sp
|
|
For example, \f(CW\*(C`dual\-headed:0.1\*(C'\fR would specify screen 1 of display
|
|
0 on the machine named ``dual\-headed''.
|
|
.Sp
|
|
Check the X11 specification for more detailed information about the
|
|
display name format.
|
|
.IP "\fBwindow_size\fR" 4
|
|
.IX Item "window_size"
|
|
Set the created window size, can be a string of the form
|
|
\&\fIwidth\fRx\fIheight\fR or a video size abbreviation. If not
|
|
specified it defaults to the size of the input video.
|
|
.IP "\fBwindow_x\fR" 4
|
|
.IX Item "window_x"
|
|
.PD 0
|
|
.IP "\fBwindow_y\fR" 4
|
|
.IX Item "window_y"
|
|
.PD
|
|
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.
|
|
.IP "\fBwindow_title\fR" 4
|
|
.IX Item "window_title"
|
|
Set the window title, if not specified default to the filename
|
|
specified for the output device.
|
|
.PP
|
|
For more information about XVideo see <\fBhttp://www.x.org/\fR>.
|
|
.PP
|
|
\fIExamples\fR
|
|
.IX Subsection "Examples"
|
|
.IP "\(bu" 4
|
|
Decode, display and encode video input with \fBffmpeg\fR at the
|
|
same time:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT OUTPUT -f xv display
|
|
.Ve
|
|
.IP "\(bu" 4
|
|
Decode and display the input video to multiple X11 windows:
|
|
.Sp
|
|
.Vb 1
|
|
\& ffmpeg -i INPUT -f xv normal -vf negate -f xv negated
|
|
.Ve
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1), \fIffserver\fR\|(1), \fIlibavdevice\fR\|(3)
|
|
.SH "AUTHORS"
|
|
.IX Header "AUTHORS"
|
|
The FFmpeg developers.
|
|
.PP
|
|
For details about the authorship, see the Git history of the project
|
|
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
|
|
\&\fBgit log\fR in the FFmpeg source directory, or browsing the
|
|
online repository at <\fBhttp://source.ffmpeg.org\fR>.
|
|
.PP
|
|
Maintainers for the specific components are listed in the file
|
|
\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.
|