forked from KolibriOS/kolibrios
2601 lines
51 KiB
Plaintext
2601 lines
51 KiB
Plaintext
=encoding utf8
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=head1 NAME
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ffmpeg-devices - FFmpeg devices
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=head1 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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=head1 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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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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Options may be set by specifying -I<option> I<value> in the
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FFmpeg tools, or by setting the value explicitly in the device
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C<AVFormatContext> options or using the F<libavutil/opt.h> API
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for programmatic use.
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=head1 INPUT DEVICES
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Input devices are configured elements in FFmpeg which enable accessing
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the data coming from a multimedia device attached to your system.
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When you configure your FFmpeg build, all the supported input devices
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are enabled by default. You can list all available ones using the
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configure option "--list-indevs".
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You can disable all the input devices using the configure option
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"--disable-indevs", and selectively enable an input device using the
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option "--enable-indev=I<INDEV>", or you can disable a particular
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input device using the option "--disable-indev=I<INDEV>".
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The option "-devices" of the ff* tools will display the list of
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supported input devices.
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A description of the currently available input devices follows.
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=head2 alsa
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ALSA (Advanced Linux Sound Architecture) input device.
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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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This device allows capturing from an ALSA device. The name of the
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device to capture has to be an ALSA card identifier.
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An ALSA identifier has the syntax:
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hw:<CARD>[,<DEV>[,<SUBDEV>]]
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where the I<DEV> and I<SUBDEV> components are optional.
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The three arguments (in order: I<CARD>,I<DEV>,I<SUBDEV>)
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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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To see the list of cards currently recognized by your system check the
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files F</proc/asound/cards> and F</proc/asound/devices>.
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For example to capture with B<ffmpeg> from an ALSA device with
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card id 0, you may run the command:
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ffmpeg -f alsa -i hw:0 alsaout.wav
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For more information see:
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E<lt>B<http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html>E<gt>
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=head3 Options
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=over 4
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=item B<sample_rate>
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Set the sample rate in Hz. Default is 48000.
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=item B<channels>
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Set the number of channels. Default is 2.
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=back
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=head2 avfoundation
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AVFoundation input device.
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AVFoundation is the currently recommended framework by Apple for streamgrabbing on OSX E<gt>= 10.7 as well as on iOS.
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The older QTKit framework has been marked deprecated since OSX version 10.7.
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The input filename has to be given in the following syntax:
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-i "[[VIDEO]:[AUDIO]]"
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The first entry selects the video input while the latter selects the audio input.
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The stream has to be specified by the device name or the device index as shown by the device list.
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Alternatively, the video and/or audio input device can be chosen by index using the
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B<-video_device_index E<lt>INDEXE<gt>>
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and/or
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B<-audio_device_index E<lt>INDEXE<gt>>
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, overriding any
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device name or index given in the input filename.
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All available devices can be enumerated by using B<-list_devices true>, listing
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all device names and corresponding indices.
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There are two device name aliases:
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=over 4
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=item C<default>
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Select the AVFoundation default device of the corresponding type.
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=item C<none>
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Do not record the corresponding media type.
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This is equivalent to specifying an empty device name or index.
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=back
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=head3 Options
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AVFoundation supports the following options:
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=over 4
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=item B<-list_devices E<lt>TRUE|FALSEE<gt>>
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If set to true, a list of all available input devices is given showing all
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device names and indices.
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=item B<-video_device_index E<lt>INDEXE<gt>>
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Specify the video device by its index. Overrides anything given in the input filename.
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=item B<-audio_device_index E<lt>INDEXE<gt>>
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Specify the audio device by its index. Overrides anything given in the input filename.
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=item B<-pixel_format E<lt>FORMATE<gt>>
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Request the video device to use a specific pixel format.
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If the specified format is not supported, a list of available formats is given
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und the first one in this list is used instead. Available pixel formats are:
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C<monob, rgb555be, rgb555le, rgb565be, rgb565le, rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0,
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bgr48be, uyvy422, yuva444p, yuva444p16le, yuv444p, yuv422p16, yuv422p10, yuv444p10,
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yuv420p, nv12, yuyv422, gray>
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=item B<-framerate>
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Set the grabbing frame rate. Default is C<ntsc>, corresponding to a
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frame rate of C<30000/1001>.
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=item B<-video_size>
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Set the video frame size.
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=item B<-capture_cursor>
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Capture the mouse pointer. Default is 0.
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=item B<-capture_mouse_clicks>
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Capture the screen mouse clicks. Default is 0.
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=back
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=head3 Examples
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=over 4
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=item *
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Print the list of AVFoundation supported devices and exit:
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$ ffmpeg -f avfoundation -list_devices true -i ""
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=item *
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Record video from video device 0 and audio from audio device 0 into out.avi:
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$ ffmpeg -f avfoundation -i "0:0" out.avi
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=item *
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Record video from video device 2 and audio from audio device 1 into out.avi:
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$ ffmpeg -f avfoundation -video_device_index 2 -i ":1" out.avi
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=item *
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Record video from the system default video device using the pixel format bgr0 and do not record any audio into out.avi:
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$ ffmpeg -f avfoundation -pixel_format bgr0 -i "default:none" out.avi
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=back
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=head2 bktr
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BSD video input device.
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=head3 Options
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=over 4
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=item B<framerate>
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Set the frame rate.
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=item B<video_size>
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Set the video frame size. Default is C<vga>.
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=item B<standard>
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Available values are:
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=over 4
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=item B<pal>
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=item B<ntsc>
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=item B<secam>
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=item B<paln>
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=item B<palm>
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=item B<ntscj>
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=back
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=back
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=head2 decklink
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The decklink input device provides capture capabilities for Blackmagic
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DeckLink devices.
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To enable this input device, you need the Blackmagic DeckLink SDK and you
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need to configure with the appropriate C<--extra-cflags>
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and C<--extra-ldflags>.
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On Windows, you need to run the IDL files through B<widl>.
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DeckLink is very picky about the formats it supports. Pixel format is
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uyvy422 or v210, framerate and video size must be determined for your device with
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B<-list_formats 1>. Audio sample rate is always 48 kHz and the number
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of channels can be 2, 8 or 16.
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=head3 Options
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=over 4
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=item B<list_devices>
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If set to B<true>, print a list of devices and exit.
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Defaults to B<false>.
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=item B<list_formats>
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If set to B<true>, print a list of supported formats and exit.
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Defaults to B<false>.
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=item B<bm_v210>
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If set to B<1>, video is captured in 10 bit v210 instead
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of uyvy422. Not all Blackmagic devices support this option.
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=back
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=head3 Examples
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=over 4
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=item *
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List input devices:
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ffmpeg -f decklink -list_devices 1 -i dummy
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=item *
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List supported formats:
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ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
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=item *
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Capture video clip at 1080i50 (format 11):
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ffmpeg -f decklink -i 'Intensity Pro@11' -acodec copy -vcodec copy output.avi
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=item *
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Capture video clip at 1080i50 10 bit:
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ffmpeg -bm_v210 1 -f decklink -i 'UltraStudio Mini Recorder@11' -acodec copy -vcodec copy output.avi
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=back
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=head2 dshow
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Windows DirectShow input device.
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DirectShow support is enabled when FFmpeg is built with the mingw-w64 project.
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Currently only audio and video devices are supported.
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Multiple devices may be opened as separate inputs, but they may also be
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opened on the same input, which should improve synchronism between them.
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The input name should be in the format:
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<TYPE>=<NAME>[:<TYPE>=<NAME>]
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where I<TYPE> can be either I<audio> or I<video>,
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and I<NAME> is the device's name or alternative name..
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=head3 Options
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If no options are specified, the device's defaults are used.
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If the device does not support the requested options, it will
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fail to open.
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=over 4
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=item B<video_size>
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Set the video size in the captured video.
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=item B<framerate>
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Set the frame rate in the captured video.
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=item B<sample_rate>
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Set the sample rate (in Hz) of the captured audio.
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=item B<sample_size>
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Set the sample size (in bits) of the captured audio.
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=item B<channels>
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Set the number of channels in the captured audio.
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=item B<list_devices>
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If set to B<true>, print a list of devices and exit.
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=item B<list_options>
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If set to B<true>, print a list of selected device's options
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and exit.
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=item B<video_device_number>
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Set video device number for devices with the same name (starts at 0,
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defaults to 0).
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=item B<audio_device_number>
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Set audio device number for devices with the same name (starts at 0,
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defaults to 0).
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=item B<pixel_format>
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Select pixel format to be used by DirectShow. This may only be set when
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the video codec is not set or set to rawvideo.
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=item B<audio_buffer_size>
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Set audio device buffer size in milliseconds (which can directly
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impact latency, depending on the device).
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Defaults to using the audio device's
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default buffer size (typically some multiple of 500ms).
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Setting this value too low can degrade performance.
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See also
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E<lt>B<http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx>E<gt>
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=item B<video_pin_name>
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Select video capture pin to use by name or alternative name.
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=item B<audio_pin_name>
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Select audio capture pin to use by name or alternative name.
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=item B<crossbar_video_input_pin_number>
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Select video input pin number for crossbar device. This will be
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routed to the crossbar device's Video Decoder output pin.
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Note that changing this value can affect future invocations
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(sets a new default) until system reboot occurs.
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=item B<crossbar_audio_input_pin_number>
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Select audio input pin number for crossbar device. This will be
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routed to the crossbar device's Audio Decoder output pin.
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Note that changing this value can affect future invocations
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(sets a new default) until system reboot occurs.
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=item B<show_video_device_dialog>
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If set to B<true>, before capture starts, popup a display dialog
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to the end user, allowing them to change video filter properties
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and configurations manually.
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Note that for crossbar devices, adjusting values in this dialog
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may be needed at times to toggle between PAL (25 fps) and NTSC (29.97)
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input frame rates, sizes, interlacing, etc. Changing these values can
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enable different scan rates/frame rates and avoiding green bars at
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the bottom, flickering scan lines, etc.
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Note that with some devices, changing these properties can also affect future
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invocations (sets new defaults) until system reboot occurs.
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=item B<show_audio_device_dialog>
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If set to B<true>, before capture starts, popup a display dialog
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to the end user, allowing them to change audio filter properties
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and configurations manually.
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=item B<show_video_crossbar_connection_dialog>
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If set to B<true>, before capture starts, popup a display
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dialog to the end user, allowing them to manually
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modify crossbar pin routings, when it opens a video device.
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=item B<show_audio_crossbar_connection_dialog>
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If set to B<true>, before capture starts, popup a display
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dialog to the end user, allowing them to manually
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modify crossbar pin routings, when it opens an audio device.
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=item B<show_analog_tv_tuner_dialog>
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If set to B<true>, before capture starts, popup a display
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dialog to the end user, allowing them to manually
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modify TV channels and frequencies.
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=item B<show_analog_tv_tuner_audio_dialog>
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If set to B<true>, before capture starts, popup a display
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dialog to the end user, allowing them to manually
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modify TV audio (like mono vs. stereo, Language A,B or C).
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=item B<audio_device_load>
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Load an audio capture filter device from file instead of searching
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it by name. It may load additional parameters too, if the filter
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supports the serialization of its properties to.
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To use this an audio capture source has to be specified, but it can
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be anything even fake one.
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=item B<audio_device_save>
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Save the currently used audio capture filter device and its
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parameters (if the filter supports it) to a file.
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If a file with the same name exists it will be overwritten.
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=item B<video_device_load>
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Load a video capture filter device from file instead of searching
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it by name. It may load additional parameters too, if the filter
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supports the serialization of its properties to.
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To use this a video capture source has to be specified, but it can
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be anything even fake one.
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=item B<video_device_save>
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Save the currently used video capture filter device and its
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parameters (if the filter supports it) to a file.
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If a file with the same name exists it will be overwritten.
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=back
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=head3 Examples
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=over 4
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=item *
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Print the list of DirectShow supported devices and exit:
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$ ffmpeg -list_devices true -f dshow -i dummy
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=item *
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Open video device I<Camera>:
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$ ffmpeg -f dshow -i video="Camera"
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=item *
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Open second video device with name I<Camera>:
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$ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
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=item *
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Open video device I<Camera> and audio device I<Microphone>:
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$ ffmpeg -f dshow -i video="Camera":audio="Microphone"
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=item *
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Print the list of supported options in selected device and exit:
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$ ffmpeg -list_options true -f dshow -i video="Camera"
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=item *
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Specify pin names to capture by name or alternative name, specify alternative device name:
|
|
|
|
$ 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"
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Configure a crossbar device, specifying crossbar pins, allow user to adjust video capture properties at startup:
|
|
|
|
$ 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"
|
|
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 dv1394
|
|
|
|
|
|
Linux DV 1394 input device.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<framerate>
|
|
|
|
Set the frame rate. Default is 25.
|
|
|
|
|
|
=item B<standard>
|
|
|
|
|
|
Available values are:
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<pal>
|
|
|
|
|
|
|
|
=item B<ntsc>
|
|
|
|
|
|
|
|
=back
|
|
|
|
|
|
Default value is C<ntsc>.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 fbdev
|
|
|
|
|
|
Linux framebuffer input device.
|
|
|
|
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
|
|
F</dev/fb0>.
|
|
|
|
For more detailed information read the file
|
|
Documentation/fb/framebuffer.txt included in the Linux source tree.
|
|
|
|
See also E<lt>B<http://linux-fbdev.sourceforge.net/>E<gt>, and fbset(1).
|
|
|
|
To record from the framebuffer device F</dev/fb0> with
|
|
B<ffmpeg>:
|
|
|
|
ffmpeg -f fbdev -framerate 10 -i /dev/fb0 out.avi
|
|
|
|
|
|
You can take a single screenshot image with the command:
|
|
|
|
ffmpeg -f fbdev -framerate 1 -i /dev/fb0 -frames:v 1 screenshot.jpeg
|
|
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<framerate>
|
|
|
|
Set the frame rate. Default is 25.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 gdigrab
|
|
|
|
|
|
Win32 GDI-based screen capture device.
|
|
|
|
This device allows you to capture a region of the display on Windows.
|
|
|
|
There are two options for the input filename:
|
|
|
|
desktop
|
|
|
|
or
|
|
|
|
title=<window_title>
|
|
|
|
|
|
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.
|
|
|
|
For example, to grab the entire desktop using B<ffmpeg>:
|
|
|
|
ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg
|
|
|
|
|
|
Grab a 640x480 region at position C<10,20>:
|
|
|
|
ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg
|
|
|
|
|
|
Grab the contents of the window named "Calculator"
|
|
|
|
ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg
|
|
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<draw_mouse>
|
|
|
|
Specify whether to draw the mouse pointer. Use the value C<0> to
|
|
not draw the pointer. Default value is C<1>.
|
|
|
|
|
|
=item B<framerate>
|
|
|
|
Set the grabbing frame rate. Default value is C<ntsc>,
|
|
corresponding to a frame rate of C<30000/1001>.
|
|
|
|
|
|
=item B<show_region>
|
|
|
|
Show grabbed region on screen.
|
|
|
|
If I<show_region> is specified with C<1>, 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.
|
|
|
|
Note that I<show_region> is incompatible with grabbing the contents
|
|
of a single window.
|
|
|
|
For example:
|
|
|
|
ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y 20 -i desktop out.mpg
|
|
|
|
|
|
|
|
=item B<video_size>
|
|
|
|
Set the video frame size. The default is to capture the full screen if F<desktop> is selected, or the full window size if F<title=I<window_title>> is selected.
|
|
|
|
|
|
=item B<offset_x>
|
|
|
|
When capturing a region with I<video_size>, set the distance from the left edge of the screen or desktop.
|
|
|
|
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 I<offset_x> value to move the region to that monitor.
|
|
|
|
|
|
=item B<offset_y>
|
|
|
|
When capturing a region with I<video_size>, set the distance from the top edge of the screen or desktop.
|
|
|
|
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 I<offset_y> value to move the region to that monitor.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 iec61883
|
|
|
|
|
|
FireWire DV/HDV input device using libiec61883.
|
|
|
|
To enable this input device, you need libiec61883, libraw1394 and
|
|
libavc1394 installed on your system. Use the configure option
|
|
C<--enable-libiec61883> to compile with the device enabled.
|
|
|
|
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.
|
|
|
|
Specify the FireWire port to be used as input file, or "auto"
|
|
to choose the first port connected.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<dvtype>
|
|
|
|
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 B<auto>, B<dv> and B<hdv> are supported.
|
|
|
|
|
|
=item B<dvbuffer>
|
|
|
|
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.
|
|
|
|
|
|
=item B<dvguid>
|
|
|
|
Select the capture device by specifying it's 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.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Grab and show the input of a FireWire DV/HDV device.
|
|
|
|
ffplay -f iec61883 -i auto
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Grab and record the input of a FireWire DV/HDV device,
|
|
using a packet buffer of 100000 packets if the source is HDV.
|
|
|
|
ffmpeg -f iec61883 -i auto -hdvbuffer 100000 out.mpg
|
|
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 jack
|
|
|
|
|
|
JACK input device.
|
|
|
|
To enable this input device during configuration you need libjack
|
|
installed on your system.
|
|
|
|
A JACK input device creates one or more JACK writable clients, one for
|
|
each audio channel, with name I<client_name>:input_I<N>, where
|
|
I<client_name> is the name provided by the application, and I<N>
|
|
is a number which identifies the channel.
|
|
Each writable client will send the acquired data to the FFmpeg input
|
|
device.
|
|
|
|
Once you have created one or more JACK readable clients, you need to
|
|
connect them to one or more JACK writable clients.
|
|
|
|
To connect or disconnect JACK clients you can use the B<jack_connect>
|
|
and B<jack_disconnect> programs, or do it through a graphical interface,
|
|
for example with B<qjackctl>.
|
|
|
|
To list the JACK clients and their properties you can invoke the command
|
|
B<jack_lsp>.
|
|
|
|
Follows an example which shows how to capture a JACK readable client
|
|
with B<ffmpeg>.
|
|
|
|
# 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
|
|
|
|
|
|
For more information read:
|
|
E<lt>B<http://jackaudio.org/>E<gt>
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<channels>
|
|
|
|
Set the number of channels. Default is 2.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 lavfi
|
|
|
|
|
|
Libavfilter input virtual device.
|
|
|
|
This input device reads data from the open output pads of a libavfilter
|
|
filtergraph.
|
|
|
|
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 B<graph>.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<graph>
|
|
|
|
Specify the filtergraph to use as input. Each video open output must be
|
|
labelled by a unique string of the form "outI<N>", where I<N> 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.
|
|
|
|
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.
|
|
|
|
If not specified defaults to the filename specified for the input
|
|
device.
|
|
|
|
|
|
=item B<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 I<graph>.
|
|
|
|
|
|
=item B<dumpgraph>
|
|
|
|
Dump graph to stderr.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item *
|
|
|
|
Create a color video stream and play it back with B<ffplay>:
|
|
|
|
ffplay -f lavfi -graph "color=c=pink [out0]" dummy
|
|
|
|
|
|
|
|
=item *
|
|
|
|
As the previous example, but use filename for specifying the graph
|
|
description, and omit the "out0" label:
|
|
|
|
ffplay -f lavfi color=c=pink
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Create three different video test filtered sources and play them:
|
|
|
|
ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Read an audio stream from a file using the amovie source and play it
|
|
back with B<ffplay>:
|
|
|
|
ffplay -f lavfi "amovie=test.wav"
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Read an audio stream and a video stream and play it back with
|
|
B<ffplay>:
|
|
|
|
ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Dump decoded frames to images and closed captions to a file (experimental):
|
|
|
|
ffmpeg -f lavfi -i "movie=test.ts[out0+subcc]" -map v frame%08d.png -map s -c copy -f rawvideo subcc.bin
|
|
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 libcdio
|
|
|
|
|
|
Audio-CD input device based on libcdio.
|
|
|
|
To enable this input device during configuration you need libcdio
|
|
installed on your system. It requires the configure option
|
|
C<--enable-libcdio>.
|
|
|
|
This device allows playing and grabbing from an Audio-CD.
|
|
|
|
For example to copy with B<ffmpeg> the entire Audio-CD in F</dev/sr0>,
|
|
you may run the command:
|
|
|
|
ffmpeg -f libcdio -i /dev/sr0 cd.wav
|
|
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<speed>
|
|
|
|
Set drive reading speed. Default value is 0.
|
|
|
|
The speed is specified CD-ROM speed units. The speed is set through
|
|
the libcdio C<cdio_cddap_speed_set> function. On many CD-ROM
|
|
drives, specifying a value too large will result in using the fastest
|
|
speed.
|
|
|
|
|
|
=item B<paranoia_mode>
|
|
|
|
Set paranoia recovery mode flags. It accepts one of the following values:
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<disable>
|
|
|
|
|
|
=item B<verify>
|
|
|
|
|
|
=item B<overlap>
|
|
|
|
|
|
=item B<neverskip>
|
|
|
|
|
|
=item B<full>
|
|
|
|
|
|
=back
|
|
|
|
|
|
Default value is B<disable>.
|
|
|
|
For more information about the available recovery modes, consult the
|
|
paranoia project documentation.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 libdc1394
|
|
|
|
|
|
IIDC1394 input device, based on libdc1394 and libraw1394.
|
|
|
|
Requires the configure option C<--enable-libdc1394>.
|
|
|
|
|
|
=head2 openal
|
|
|
|
|
|
The OpenAL input device provides audio capture on all systems with a
|
|
working OpenAL 1.1 implementation.
|
|
|
|
To enable this input device during configuration, you need OpenAL
|
|
headers and libraries installed on your system, and need to configure
|
|
FFmpeg with C<--enable-openal>.
|
|
|
|
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
|
|
C<--extra-cflags> and C<--extra-ldflags> for allowing the build
|
|
system to locate the OpenAL headers and libraries.
|
|
|
|
An incomplete list of OpenAL implementations follows:
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<Creative>
|
|
|
|
The official Windows implementation, providing hardware acceleration
|
|
with supported devices and software fallback.
|
|
See E<lt>B<http://openal.org/>E<gt>.
|
|
|
|
=item B<OpenAL Soft>
|
|
|
|
Portable, open source (LGPL) software implementation. Includes
|
|
backends for the most common sound APIs on the Windows, Linux,
|
|
Solaris, and BSD operating systems.
|
|
See E<lt>B<http://kcat.strangesoft.net/openal.html>E<gt>.
|
|
|
|
=item B<Apple>
|
|
|
|
OpenAL is part of Core Audio, the official Mac OS X Audio interface.
|
|
See E<lt>B<http://developer.apple.com/technologies/mac/audio-and-video.html>E<gt>
|
|
|
|
=back
|
|
|
|
|
|
This device allows one to capture from an audio input device handled
|
|
through OpenAL.
|
|
|
|
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 I<list_devices>.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<channels>
|
|
|
|
Set the number of channels in the captured audio. Only the values
|
|
B<1> (monaural) and B<2> (stereo) are currently supported.
|
|
Defaults to B<2>.
|
|
|
|
|
|
=item B<sample_size>
|
|
|
|
Set the sample size (in bits) of the captured audio. Only the values
|
|
B<8> and B<16> are currently supported. Defaults to
|
|
B<16>.
|
|
|
|
|
|
=item B<sample_rate>
|
|
|
|
Set the sample rate (in Hz) of the captured audio.
|
|
Defaults to B<44.1k>.
|
|
|
|
|
|
=item B<list_devices>
|
|
|
|
If set to B<true>, print a list of devices and exit.
|
|
Defaults to B<false>.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
Print the list of OpenAL supported devices and exit:
|
|
|
|
$ ffmpeg -list_devices true -f openal -i dummy out.ogg
|
|
|
|
|
|
Capture from the OpenAL device F<DR-BT101 via PulseAudio>:
|
|
|
|
$ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg
|
|
|
|
|
|
Capture from the default device (note the empty string '' as filename):
|
|
|
|
$ ffmpeg -f openal -i '' out.ogg
|
|
|
|
|
|
Capture from two devices simultaneously, writing to two different files,
|
|
within the same B<ffmpeg> command:
|
|
|
|
$ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg
|
|
|
|
Note: not all OpenAL implementations support multiple simultaneous capture -
|
|
try the latest OpenAL Soft if the above does not work.
|
|
|
|
|
|
=head2 oss
|
|
|
|
|
|
Open Sound System input device.
|
|
|
|
The filename to provide to the input device is the device node
|
|
representing the OSS input device, and is usually set to
|
|
F</dev/dsp>.
|
|
|
|
For example to grab from F</dev/dsp> using B<ffmpeg> use the
|
|
command:
|
|
|
|
ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
|
|
|
|
|
|
For more information about OSS see:
|
|
E<lt>B<http://manuals.opensound.com/usersguide/dsp.html>E<gt>
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<sample_rate>
|
|
|
|
Set the sample rate in Hz. Default is 48000.
|
|
|
|
|
|
=item B<channels>
|
|
|
|
Set the number of channels. Default is 2.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
|
|
=head2 pulse
|
|
|
|
|
|
PulseAudio input device.
|
|
|
|
To enable this output device you need to configure FFmpeg with C<--enable-libpulse>.
|
|
|
|
The filename to provide to the input device is a source device or the
|
|
string "default"
|
|
|
|
To list the PulseAudio source devices and their properties you can invoke
|
|
the command B<pactl list sources>.
|
|
|
|
More information about PulseAudio can be found on E<lt>B<http://www.pulseaudio.org>E<gt>.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<server>
|
|
|
|
Connect to a specific PulseAudio server, specified by an IP address.
|
|
Default server is used when not provided.
|
|
|
|
|
|
=item B<name>
|
|
|
|
Specify the application name PulseAudio will use when showing active clients,
|
|
by default it is the C<LIBAVFORMAT_IDENT> string.
|
|
|
|
|
|
=item B<stream_name>
|
|
|
|
Specify the stream name PulseAudio will use when showing active streams,
|
|
by default it is "record".
|
|
|
|
|
|
=item B<sample_rate>
|
|
|
|
Specify the samplerate in Hz, by default 48kHz is used.
|
|
|
|
|
|
=item B<channels>
|
|
|
|
Specify the channels in use, by default 2 (stereo) is set.
|
|
|
|
|
|
=item B<frame_size>
|
|
|
|
Specify the number of bytes per frame, by default it is set to 1024.
|
|
|
|
|
|
=item B<fragment_size>
|
|
|
|
Specify the minimal buffering fragment in PulseAudio, it will affect the
|
|
audio latency. By default it is unset.
|
|
|
|
|
|
=item B<wallclock>
|
|
|
|
Set the initial PTS using the current time. Default is 1.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
Record a stream from default device:
|
|
|
|
ffmpeg -f pulse -i default /tmp/pulse.wav
|
|
|
|
|
|
|
|
=head2 qtkit
|
|
|
|
|
|
QTKit input device.
|
|
|
|
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.
|
|
|
|
|
|
ffmpeg -f qtkit -i "0" out.mpg
|
|
|
|
|
|
|
|
ffmpeg -f qtkit -video_device_index 0 -i "" out.mpg
|
|
|
|
|
|
|
|
ffmpeg -f qtkit -i "default" out.mpg
|
|
|
|
|
|
|
|
ffmpeg -f qtkit -list_devices true -i ""
|
|
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<frame_rate>
|
|
|
|
Set frame rate. Default is 30.
|
|
|
|
|
|
=item B<list_devices>
|
|
|
|
If set to C<true>, print a list of devices and exit. Default is
|
|
C<false>.
|
|
|
|
|
|
=item B<video_device_index>
|
|
|
|
Select the video device by index for devices with the same name (starts at 0).
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 sndio
|
|
|
|
|
|
sndio input device.
|
|
|
|
To enable this input device during configuration you need libsndio
|
|
installed on your system.
|
|
|
|
The filename to provide to the input device is the device node
|
|
representing the sndio input device, and is usually set to
|
|
F</dev/audio0>.
|
|
|
|
For example to grab from F</dev/audio0> using B<ffmpeg> use the
|
|
command:
|
|
|
|
ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
|
|
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<sample_rate>
|
|
|
|
Set the sample rate in Hz. Default is 48000.
|
|
|
|
|
|
=item B<channels>
|
|
|
|
Set the number of channels. Default is 2.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 video4linux2, v4l2
|
|
|
|
|
|
Video4Linux2 input video device.
|
|
|
|
"v4l2" can be used as alias for "video4linux2".
|
|
|
|
If FFmpeg is built with v4l-utils support (by using the
|
|
C<--enable-libv4l2> configure option), it is possible to use it with the
|
|
C<-use_libv4l2> input device option.
|
|
|
|
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 F</dev/videoI<N>>, where I<N> is a number associated to
|
|
the device.
|
|
|
|
Video4Linux2 devices usually support a limited set of
|
|
I<width>xI<height> sizes and frame rates. You can check which are
|
|
supported using B<-list_formats all> for Video4Linux2 devices.
|
|
Some devices, like TV cards, support one or more standards. It is possible
|
|
to list all the supported standards using B<-list_standards all>.
|
|
|
|
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
|
|
B<-timestamps abs> or B<-ts abs> option can be used to force
|
|
conversion into the real time clock.
|
|
|
|
Some usage examples of the video4linux2 device with B<ffmpeg>
|
|
and B<ffplay>:
|
|
|
|
=over 4
|
|
|
|
|
|
=item *
|
|
|
|
List supported formats for a video4linux2 device:
|
|
|
|
ffplay -f video4linux2 -list_formats all /dev/video0
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Grab and show the input of a video4linux2 device:
|
|
|
|
ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Grab and record the input of a video4linux2 device, leave the
|
|
frame rate and size as previously set:
|
|
|
|
ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
|
|
|
|
|
|
=back
|
|
|
|
|
|
For more information about Video4Linux, check E<lt>B<http://linuxtv.org/>E<gt>.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<standard>
|
|
|
|
Set the standard. Must be the name of a supported standard. To get a
|
|
list of the supported standards, use the B<list_standards>
|
|
option.
|
|
|
|
|
|
=item B<channel>
|
|
|
|
Set the input channel number. Default to -1, which means using the
|
|
previously selected channel.
|
|
|
|
|
|
=item B<video_size>
|
|
|
|
Set the video frame size. The argument must be a string in the form
|
|
I<WIDTH>xI<HEIGHT> or a valid size abbreviation.
|
|
|
|
|
|
=item B<pixel_format>
|
|
|
|
Select the pixel format (only valid for raw video input).
|
|
|
|
|
|
=item B<input_format>
|
|
|
|
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.
|
|
|
|
|
|
=item B<framerate>
|
|
|
|
Set the preferred video frame rate.
|
|
|
|
|
|
=item B<list_formats>
|
|
|
|
List available formats (supported pixel formats, codecs, and frame
|
|
sizes) and exit.
|
|
|
|
Available values are:
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<all>
|
|
|
|
Show all available (compressed and non-compressed) formats.
|
|
|
|
|
|
=item B<raw>
|
|
|
|
Show only raw video (non-compressed) formats.
|
|
|
|
|
|
=item B<compressed>
|
|
|
|
Show only compressed formats.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=item B<list_standards>
|
|
|
|
List supported standards and exit.
|
|
|
|
Available values are:
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<all>
|
|
|
|
Show all supported standards.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=item B<timestamps, ts>
|
|
|
|
Set type of timestamps for grabbed frames.
|
|
|
|
Available values are:
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<default>
|
|
|
|
Use timestamps from the kernel.
|
|
|
|
|
|
=item B<abs>
|
|
|
|
Use absolute timestamps (wall clock).
|
|
|
|
|
|
=item B<mono2abs>
|
|
|
|
Force conversion from monotonic to absolute timestamps.
|
|
|
|
=back
|
|
|
|
|
|
Default value is C<default>.
|
|
|
|
|
|
=item B<use_libv4l2>
|
|
|
|
Use libv4l2 (v4l-utils) conversion functions. Default is 0.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 vfwcap
|
|
|
|
|
|
VfW (Video for Windows) capture input device.
|
|
|
|
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.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<video_size>
|
|
|
|
Set the video frame size.
|
|
|
|
|
|
=item B<framerate>
|
|
|
|
Set the grabbing frame rate. Default value is C<ntsc>,
|
|
corresponding to a frame rate of C<30000/1001>.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 x11grab
|
|
|
|
|
|
X11 video input device.
|
|
|
|
To enable this input device during configuration you need libxcb
|
|
installed on your system. It will be automatically detected during
|
|
configuration.
|
|
|
|
Alternatively, the configure option B<--enable-x11grab> exists
|
|
for legacy Xlib users.
|
|
|
|
This device allows one to capture a region of an X11 display.
|
|
|
|
The filename passed as input has the syntax:
|
|
|
|
[<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>]
|
|
|
|
|
|
I<hostname>:I<display_number>.I<screen_number> specifies the
|
|
X11 display name of the screen to grab from. I<hostname> can be
|
|
omitted, and defaults to "localhost". The environment variable
|
|
B<DISPLAY> contains the default display name.
|
|
|
|
I<x_offset> and I<y_offset> specify the offsets of the grabbed
|
|
area with respect to the top-left border of the X11 screen. They
|
|
default to 0.
|
|
|
|
Check the X11 documentation (e.g. B<man X>) for more detailed
|
|
information.
|
|
|
|
Use the B<xdpyinfo> program for getting basic information about
|
|
the properties of your X11 display (e.g. grep for "name" or
|
|
"dimensions").
|
|
|
|
For example to grab from F<:0.0> using B<ffmpeg>:
|
|
|
|
ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
|
|
|
|
Grab at position C<10,20>:
|
|
|
|
ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
|
|
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<draw_mouse>
|
|
|
|
Specify whether to draw the mouse pointer. A value of C<0> specify
|
|
not to draw the pointer. Default value is C<1>.
|
|
|
|
|
|
=item B<follow_mouse>
|
|
|
|
Make the grabbed area follow the mouse. The argument can be
|
|
C<centered> or a number of pixels I<PIXELS>.
|
|
|
|
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 I<PIXELS> (greater than
|
|
zero) to the edge of region.
|
|
|
|
For example:
|
|
|
|
ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
|
|
|
|
To follow only when the mouse pointer reaches within 100 pixels to edge:
|
|
|
|
ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
|
|
|
|
|
|
=item B<framerate>
|
|
|
|
Set the grabbing frame rate. Default value is C<ntsc>,
|
|
corresponding to a frame rate of C<30000/1001>.
|
|
|
|
|
|
=item B<show_region>
|
|
|
|
Show grabbed region on screen.
|
|
|
|
If I<show_region> is specified with C<1>, 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.
|
|
|
|
|
|
=item B<region_border>
|
|
|
|
Set the region border thickness if B<-show_region 1> is used.
|
|
Range is 1 to 128 and default is 3 (XCB-based x11grab only).
|
|
|
|
For example:
|
|
|
|
ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
|
|
|
|
|
|
With I<follow_mouse>:
|
|
|
|
ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
|
|
|
|
|
|
|
|
=item B<video_size>
|
|
|
|
Set the video frame size. Default value is C<vga>.
|
|
|
|
|
|
=item B<use_shm>
|
|
|
|
Use the MIT-SHM extension for shared memory. Default value is C<1>.
|
|
It may be necessary to disable it for remote displays (legacy x11grab
|
|
only).
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 I<grab_x> I<grab_y> AVOption
|
|
|
|
|
|
The syntax is:
|
|
|
|
-grab_x <x_offset> -grab_y <y_offset>
|
|
|
|
|
|
Set the grabbing region coordinates. They are expressed as offset from the top left
|
|
corner of the X11 window. The default value is 0.
|
|
|
|
|
|
|
|
=head1 OUTPUT DEVICES
|
|
|
|
|
|
Output devices are configured elements in FFmpeg that can write
|
|
multimedia data to an output device attached to your system.
|
|
|
|
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".
|
|
|
|
You can disable all the output devices using the configure option
|
|
"--disable-outdevs", and selectively enable an output device using the
|
|
option "--enable-outdev=I<OUTDEV>", or you can disable a particular
|
|
input device using the option "--disable-outdev=I<OUTDEV>".
|
|
|
|
The option "-devices" of the ff* tools will display the list of
|
|
enabled output devices.
|
|
|
|
A description of the currently available output devices follows.
|
|
|
|
|
|
=head2 alsa
|
|
|
|
|
|
ALSA (Advanced Linux Sound Architecture) output device.
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item *
|
|
|
|
Play a file on default ALSA device:
|
|
|
|
ffmpeg -i INPUT -f alsa default
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Play a file on soundcard 1, audio device 7:
|
|
|
|
ffmpeg -i INPUT -f alsa hw:1,7
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 caca
|
|
|
|
|
|
CACA output device.
|
|
|
|
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.
|
|
|
|
To enable this output device you need to configure FFmpeg with
|
|
C<--enable-libcaca>.
|
|
libcaca is a graphics library that outputs text instead of pixels.
|
|
|
|
For more information about libcaca, check:
|
|
E<lt>B<http://caca.zoy.org/wiki/libcaca>E<gt>
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<window_title>
|
|
|
|
Set the CACA window title, if not specified default to the filename
|
|
specified for the output device.
|
|
|
|
|
|
=item B<window_size>
|
|
|
|
Set the CACA window size, can be a string of the form
|
|
I<width>xI<height> or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video.
|
|
|
|
|
|
=item B<driver>
|
|
|
|
Set display driver.
|
|
|
|
|
|
=item B<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 C<-list_dither algorithms>.
|
|
|
|
|
|
=item B<antialias>
|
|
|
|
Set antialias method. Antialiasing smoothens the rendered
|
|
image and avoids the commonly seen staircase effect.
|
|
The accepted values are listed with C<-list_dither antialiases>.
|
|
|
|
|
|
=item B<charset>
|
|
|
|
Set which characters are going to be used when rendering text.
|
|
The accepted values are listed with C<-list_dither charsets>.
|
|
|
|
|
|
=item B<color>
|
|
|
|
Set color to be used when rendering text.
|
|
The accepted values are listed with C<-list_dither colors>.
|
|
|
|
|
|
=item B<list_drivers>
|
|
|
|
If set to B<true>, print a list of available drivers and exit.
|
|
|
|
|
|
=item B<list_dither>
|
|
|
|
List available dither options related to the argument.
|
|
The argument must be one of C<algorithms>, C<antialiases>,
|
|
C<charsets>, C<colors>.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item *
|
|
|
|
The following command shows the B<ffmpeg> output is an
|
|
CACA window, forcing its size to 80x25:
|
|
|
|
ffmpeg -i INPUT -vcodec rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Show the list of available drivers and exit:
|
|
|
|
ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Show the list of available dither colors and exit:
|
|
|
|
ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 decklink
|
|
|
|
|
|
The decklink output device provides playback capabilities for Blackmagic
|
|
DeckLink devices.
|
|
|
|
To enable this output device, you need the Blackmagic DeckLink SDK and you
|
|
need to configure with the appropriate C<--extra-cflags>
|
|
and C<--extra-ldflags>.
|
|
On Windows, you need to run the IDL files through B<widl>.
|
|
|
|
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
|
|
B<-list_formats 1>. Audio sample rate is always 48 kHz.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<list_devices>
|
|
|
|
If set to B<true>, print a list of devices and exit.
|
|
Defaults to B<false>.
|
|
|
|
|
|
=item B<list_formats>
|
|
|
|
If set to B<true>, print a list of supported formats and exit.
|
|
Defaults to B<false>.
|
|
|
|
|
|
=item B<preroll>
|
|
|
|
Amount of time to preroll video in seconds.
|
|
Defaults to B<0.5>.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item *
|
|
|
|
List output devices:
|
|
|
|
ffmpeg -i test.avi -f decklink -list_devices 1 dummy
|
|
|
|
|
|
|
|
=item *
|
|
|
|
List supported formats:
|
|
|
|
ffmpeg -i test.avi -f decklink -list_formats 1 'DeckLink Mini Monitor'
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Play video clip:
|
|
|
|
ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Play video clip with non-standard framerate or video size:
|
|
|
|
ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'
|
|
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head2 fbdev
|
|
|
|
|
|
Linux framebuffer output device.
|
|
|
|
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
|
|
F</dev/fb0>.
|
|
|
|
For more detailed information read the file
|
|
F<Documentation/fb/framebuffer.txt> included in the Linux source tree.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<xoffset>
|
|
|
|
|
|
=item B<yoffset>
|
|
|
|
Set x/y coordinate of top left corner. Default is 0.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
Play a file on framebuffer device F</dev/fb0>.
|
|
Required pixel format depends on current framebuffer settings.
|
|
|
|
ffmpeg -re -i INPUT -vcodec rawvideo -pix_fmt bgra -f fbdev /dev/fb0
|
|
|
|
|
|
See also E<lt>B<http://linux-fbdev.sourceforge.net/>E<gt>, and fbset(1).
|
|
|
|
|
|
=head2 opengl
|
|
|
|
OpenGL output device.
|
|
|
|
To enable this output device you need to configure FFmpeg with C<--enable-opengl>.
|
|
|
|
This output device allows one to render to OpenGL context.
|
|
Context may be provided by application or default SDL window is created.
|
|
|
|
When device renders to external context, application must implement handlers for following messages:
|
|
C<AV_DEV_TO_APP_CREATE_WINDOW_BUFFER> - create OpenGL context on current thread.
|
|
C<AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER> - make OpenGL context current.
|
|
C<AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER> - swap buffers.
|
|
C<AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER> - destroy OpenGL context.
|
|
Application is also required to inform a device about current resolution by sending C<AV_APP_TO_DEV_WINDOW_SIZE> message.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<background>
|
|
|
|
Set background color. Black is a default.
|
|
|
|
=item B<no_window>
|
|
|
|
Disables default SDL window when set to non-zero value.
|
|
Application must provide OpenGL context and both C<window_size_cb> and C<window_swap_buffers_cb> callbacks when set.
|
|
|
|
=item B<window_title>
|
|
|
|
Set the SDL window title, if not specified default to the filename specified for the output device.
|
|
Ignored when B<no_window> is set.
|
|
|
|
=item B<window_size>
|
|
|
|
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 B<no_window> is not set.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
Play a file on SDL window using OpenGL rendering:
|
|
|
|
ffmpeg -i INPUT -f opengl "window title"
|
|
|
|
|
|
|
|
=head2 oss
|
|
|
|
|
|
OSS (Open Sound System) output device.
|
|
|
|
|
|
=head2 pulse
|
|
|
|
|
|
PulseAudio output device.
|
|
|
|
To enable this output device you need to configure FFmpeg with C<--enable-libpulse>.
|
|
|
|
More information about PulseAudio can be found on E<lt>B<http://www.pulseaudio.org>E<gt>
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<server>
|
|
|
|
Connect to a specific PulseAudio server, specified by an IP address.
|
|
Default server is used when not provided.
|
|
|
|
|
|
=item B<name>
|
|
|
|
Specify the application name PulseAudio will use when showing active clients,
|
|
by default it is the C<LIBAVFORMAT_IDENT> string.
|
|
|
|
|
|
=item B<stream_name>
|
|
|
|
Specify the stream name PulseAudio will use when showing active streams,
|
|
by default it is set to the specified output name.
|
|
|
|
|
|
=item B<device>
|
|
|
|
Specify the device to use. Default device is used when not provided.
|
|
List of output devices can be obtained with command B<pactl list sinks>.
|
|
|
|
|
|
=item B<buffer_size>
|
|
|
|
|
|
=item B<buffer_duration>
|
|
|
|
Control the size and duration of the PulseAudio buffer. A small buffer
|
|
gives more control, but requires more frequent updates.
|
|
|
|
B<buffer_size> specifies size in bytes while
|
|
B<buffer_duration> specifies duration in milliseconds.
|
|
|
|
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.
|
|
|
|
|
|
=item B<prebuf>
|
|
|
|
Specify pre-buffering size in bytes. The server does not start with
|
|
playback before at least B<prebuf> bytes are available in the
|
|
buffer. By default this option is initialized to the same value as
|
|
B<buffer_size> or B<buffer_duration> (whichever is bigger).
|
|
|
|
|
|
=item B<minreq>
|
|
|
|
Specify minimum request size in bytes. The server does not request less
|
|
than B<minreq> 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.
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
Play a file on default device on default server:
|
|
|
|
ffmpeg -i INPUT -f pulse "stream name"
|
|
|
|
|
|
|
|
=head2 sdl
|
|
|
|
|
|
SDL (Simple DirectMedia Layer) output device.
|
|
|
|
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.
|
|
|
|
To enable this output device you need libsdl installed on your system
|
|
when configuring your build.
|
|
|
|
For more information about SDL, check:
|
|
E<lt>B<http://www.libsdl.org/>E<gt>
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
|
|
=item B<window_title>
|
|
|
|
Set the SDL window title, if not specified default to the filename
|
|
specified for the output device.
|
|
|
|
|
|
=item B<icon_title>
|
|
|
|
Set the name of the iconified SDL window, if not specified it is set
|
|
to the same value of I<window_title>.
|
|
|
|
|
|
=item B<window_size>
|
|
|
|
Set the SDL window size, can be a string of the form
|
|
I<width>xI<height> or a video size abbreviation.
|
|
If not specified it defaults to the size of the input video,
|
|
downscaled according to the aspect ratio.
|
|
|
|
|
|
=item B<window_fullscreen>
|
|
|
|
Set fullscreen mode when non-zero value is provided.
|
|
Default value is zero.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Interactive commands
|
|
|
|
|
|
The window created by the device can be controlled through the
|
|
following interactive commands.
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<q, ESC>
|
|
|
|
Quit the device immediately.
|
|
|
|
=back
|
|
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
The following command shows the B<ffmpeg> output is an
|
|
SDL window, forcing its size to the qcif format:
|
|
|
|
ffmpeg -i INPUT -vcodec rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL output"
|
|
|
|
|
|
|
|
=head2 sndio
|
|
|
|
|
|
sndio audio output device.
|
|
|
|
|
|
=head2 xv
|
|
|
|
|
|
XV (XVideo) output device.
|
|
|
|
This output device allows one to show a video stream in a X Window System
|
|
window.
|
|
|
|
|
|
=head3 Options
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item B<display_name>
|
|
|
|
Specify the hardware display name, which determines the display and
|
|
communications domain to be used.
|
|
|
|
The display name or DISPLAY environment variable can be a string in
|
|
the format I<hostname>[:I<number>[.I<screen_number>]].
|
|
|
|
I<hostname> specifies the name of the host machine on which the
|
|
display is physically attached. I<number> specifies the number of
|
|
the display server on that host machine. I<screen_number> specifies
|
|
the screen to be used on that server.
|
|
|
|
If unspecified, it defaults to the value of the DISPLAY environment
|
|
variable.
|
|
|
|
For example, C<dual-headed:0.1> would specify screen 1 of display
|
|
0 on the machine named ``dual-headed''.
|
|
|
|
Check the X11 specification for more detailed information about the
|
|
display name format.
|
|
|
|
|
|
=item B<window_id>
|
|
|
|
When set to non-zero value then device doesn't create new window,
|
|
but uses existing one with provided I<window_id>. By default
|
|
this options is set to zero and device creates its own window.
|
|
|
|
|
|
=item B<window_size>
|
|
|
|
Set the created window size, can be a string of the form
|
|
I<width>xI<height> or a video size abbreviation. If not
|
|
specified it defaults to the size of the input video.
|
|
Ignored when I<window_id> is set.
|
|
|
|
|
|
=item B<window_x>
|
|
|
|
|
|
=item B<window_y>
|
|
|
|
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 I<window_id> is set.
|
|
|
|
|
|
=item B<window_title>
|
|
|
|
Set the window title, if not specified default to the filename
|
|
specified for the output device. Ignored when I<window_id> is set.
|
|
|
|
=back
|
|
|
|
|
|
For more information about XVideo see E<lt>B<http://www.x.org/>E<gt>.
|
|
|
|
|
|
=head3 Examples
|
|
|
|
|
|
|
|
=over 4
|
|
|
|
|
|
=item *
|
|
|
|
Decode, display and encode video input with B<ffmpeg> at the
|
|
same time:
|
|
|
|
ffmpeg -i INPUT OUTPUT -f xv display
|
|
|
|
|
|
|
|
=item *
|
|
|
|
Decode and display the input video to multiple X11 windows:
|
|
|
|
ffmpeg -i INPUT -f xv normal -vf negate -f xv negated
|
|
|
|
|
|
=back
|
|
|
|
|
|
|
|
|
|
=head1 SEE ALSO
|
|
|
|
|
|
|
|
ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavdevice(3)
|
|
|
|
|
|
=head1 AUTHORS
|
|
|
|
|
|
The FFmpeg developers.
|
|
|
|
For details about the authorship, see the Git history of the project
|
|
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
|
|
B<git log> in the FFmpeg source directory, or browsing the
|
|
online repository at E<lt>B<http://source.ffmpeg.org>E<gt>.
|
|
|
|
Maintainers for the specific components are listed in the file
|
|
F<MAINTAINERS> in the source code tree.
|
|
|
|
|
|
|