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157 lines
4.4 KiB
Plaintext
157 lines
4.4 KiB
Plaintext
@chapter Output Devices
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@c man begin OUTPUT DEVICES
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Output devices are configured elements in FFmpeg which allow to write
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multimedia data to an output device attached to your system.
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When you configure your FFmpeg build, all the supported output devices
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are enabled by default. You can list all available ones using the
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configure option "--list-outdevs".
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You can disable all the output devices using the configure option
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"--disable-outdevs", and selectively enable an output device using the
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option "--enable-outdev=@var{OUTDEV}", or you can disable a particular
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input device using the option "--disable-outdev=@var{OUTDEV}".
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The option "-formats" of the ff* tools will display the list of
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enabled output devices (amongst the muxers).
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A description of the currently available output devices follows.
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@section alsa
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ALSA (Advanced Linux Sound Architecture) output device.
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@section caca
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CACA output device.
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This output device allows to show a video stream in CACA window.
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Only one CACA window is allowed per application, so you can
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have only one instance of this output device in an application.
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To enable this output device you need to configure FFmpeg with
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@code{--enable-libcaca}.
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libcaca is a graphics library that outputs text instead of pixels.
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For more information about libcaca, check:
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@url{http://caca.zoy.org/wiki/libcaca}
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@subsection Options
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@table @option
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@item window_title
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Set the CACA window title, if not specified default to the filename
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specified for the output device.
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@item window_size
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Set the CACA window size, can be a string of the form
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@var{width}x@var{height} or a video size abbreviation.
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If not specified it defaults to the size of the input video.
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@item driver
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Set display driver.
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@item algorithm
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Set dithering algorithm. Dithering is necessary
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because the picture being rendered has usually far more colours than
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the available palette.
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The accepted values are listed with @code{-list_dither algorithms}.
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@item antialias
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Set antialias method. Antialiasing smoothens the rendered
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image and avoids the commonly seen staircase effect.
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The accepted values are listed with @code{-list_dither antialiases}.
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@item charset
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Set which characters are going to be used when rendering text.
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The accepted values are listed with @code{-list_dither charsets}.
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@item color
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Set color to be used when rendering text.
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The accepted values are listed with @code{-list_dither colors}.
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@item list_drivers
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If set to @option{true}, print a list of available drivers and exit.
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@item list_dither
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List available dither options related to the argument.
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The argument must be one of @code{algorithms}, @code{antialiases},
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@code{charsets}, @code{colors}.
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@end table
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@subsection Examples
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@itemize
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@item
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The following command shows the @command{ffmpeg} output is an
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CACA window, forcing its size to 80x25:
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@example
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ffmpeg -i INPUT -vcodec rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
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@end example
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@item
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Show the list of available drivers and exit:
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@example
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ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
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@end example
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@item
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Show the list of available dither colors and exit:
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@example
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ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
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@end example
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@end itemize
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@section oss
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OSS (Open Sound System) output device.
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@section sdl
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SDL (Simple DirectMedia Layer) output device.
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This output device allows to show a video stream in an SDL
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window. Only one SDL window is allowed per application, so you can
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have only one instance of this output device in an application.
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To enable this output device you need libsdl installed on your system
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when configuring your build.
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For more information about SDL, check:
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@url{http://www.libsdl.org/}
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@subsection Options
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@table @option
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@item window_title
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Set the SDL window title, if not specified default to the filename
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specified for the output device.
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@item icon_title
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Set the name of the iconified SDL window, if not specified it is set
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to the same value of @var{window_title}.
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@item window_size
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Set the SDL window size, can be a string of the form
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@var{width}x@var{height} or a video size abbreviation.
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If not specified it defaults to the size of the input video,
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downscaled according to the aspect ratio.
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@end table
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@subsection Examples
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The following command shows the @command{ffmpeg} output is an
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SDL window, forcing its size to the qcif format:
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@example
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ffmpeg -i INPUT -vcodec rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL output"
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@end example
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@section sndio
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sndio audio output device.
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@c man end OUTPUT DEVICES
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