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\input texinfo @c -*- texinfo -*-
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@settitle FFmpeg Documentation
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@titlepage
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@sp 7
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@center @titlefont{FFmpeg Documentation}
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@sp 3
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@end titlepage
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@chapter Introduction
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FFmpeg is a very fast video and audio converter. It can also grab from
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a live audio/video source.
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The command line interface is designed to be intuitive, in the sense
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that ffmpeg tries to figure out all the parameters, when
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possible. You have usually to give only the target bitrate you want.
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FFmpeg can also convert from any sample rate to any other, and resize
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video on the fly with a high quality polyphase filter.
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@chapter Quick Start
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@c man begin EXAMPLES
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@section Video and Audio grabbing
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FFmpeg can use a video4linux compatible video source and any Open Sound
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System audio source:
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@example
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ffmpeg /tmp/out.mpg 
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@end example
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Note that you must activate the right video source and channel before
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launching ffmpeg. You can use any TV viewer such as xawtv
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(@url{http://bytesex.org/xawtv/}) by Gerd Knorr which I find very
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good. You must also set correctly the audio recording levels with a
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standard mixer.
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@section Video and Audio file format conversion
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* ffmpeg can use any supported file format and protocol as input: 
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Examples:
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* You can input from YUV files:
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@example
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ffmpeg -i /tmp/test%d.Y /tmp/out.mpg 
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@end example
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It will use the files: 
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@example
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/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
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/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
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@end example
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The Y files use twice the resolution of the U and V files. They are
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raw files, without header. They can be generated by all decent video
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decoders. You must specify the size of the image with the @option{-s} option
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if ffmpeg cannot guess it.
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* You can input from a RAW YUV420P file:
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@example
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ffmpeg -i /tmp/test.yuv /tmp/out.avi
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@end example
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The RAW YUV420P is a file containing RAW YUV planar, for each frame first
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come the Y plane followed by U and V planes, which are half vertical and
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horizontal resolution.
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* You can output to a RAW YUV420P file:
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@example
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ffmpeg -i mydivx.avi -o hugefile.yuv
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@end example
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* You can set several input files and output files:
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@example
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ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
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@end example
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Convert the audio file a.wav and the raw yuv video file a.yuv
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to mpeg file a.mpg
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* You can also do audio and video conversions at the same time:
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@example
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ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
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@end example
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Convert the sample rate of a.wav to 22050 Hz and encode it to MPEG audio.
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* You can encode to several formats at the same time and define a
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mapping from input stream to output streams:
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@example
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ffmpeg -i /tmp/a.wav -ab 64 /tmp/a.mp2 -ab 128 /tmp/b.mp2 -map 0:0 -map 0:0
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@end example
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Convert a.wav to a.mp2 at 64 kbits and b.mp2 at 128 kbits. '-map
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file:index' specify which input stream is used for each output
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stream, in the order of the definition of output streams.
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* You can transcode decrypted VOBs
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@example
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ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800 -g 300 -bf 2 -acodec mp3 -ab 128 snatch.avi
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@end example
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This is a typical DVD ripper example, input from a VOB file, output
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to an AVI file with MPEG-4 video and MP3 audio, note that in this
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command we use B frames so the MPEG-4 stream is DivX5 compatible, GOP
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size is 300 that means an INTRA frame every 10 seconds for 29.97 fps
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input video.  Also the audio stream is MP3 encoded so you need LAME
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support which is enabled using @code{--enable-mp3lame} when
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configuring.  The mapping is particularly useful for DVD transcoding
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to get the desired audio language.
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NOTE: to see the supported input formats, use @code{ffmpeg -formats}.
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@c man end
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@chapter Invocation
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@section Syntax
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The generic syntax is:
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@example 
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@c man begin SYNOPSIS
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ffmpeg [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
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@c man end
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@end example
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@c man begin DESCRIPTION
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If no input file is given, audio/video grabbing is done.
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As a general rule, options are applied to the next specified
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file. For example, if you give the @option{-b 64} option, it sets the video
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bitrate of the next file. Format option may be needed for raw input
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files.
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By default, ffmpeg tries to convert as losslessly as possible: it
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uses the same audio and video parameter for the outputs as the one
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specified for the inputs.
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@c man end
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@c man begin OPTIONS
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@section Main options
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@table @option
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@item -L
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show license
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@item -h
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show help
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@item -formats
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show available formats, codecs, protocols, ...
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@item -f fmt              
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force format
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@item -i filename         
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input file name
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@item -y                  
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overwrite output files
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@item -t duration         
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set the recording time in seconds. @code{hh:mm:ss[.xxx]} syntax is also
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supported.
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@item -ss position
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seek to given time position. @code{hh:mm:ss[.xxx]} syntax is also
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supported.
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@item -title string       
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set the title
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@item -author string      
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set the author
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@item -copyright string   
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set the copyright
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@item -comment string     
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set the comment
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@item -target type
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specify target file type ("vcd", "svcd", "dvd", "dv", "pal-vcd", "ntsc-svcd", ... ). All the format
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options (bitrate, codecs, buffer sizes) are automatically set by this
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option. You can just type:
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@example
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ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
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@end example
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Nevertheless you can specify additional options as long as you know they do not compromise the
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standard, as in:
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@example
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ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
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@end example
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@item -hq
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activate high quality settings
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@item -itsoffset offset
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set the input time offset in seconds. @code{[-]hh:mm:ss[.xxx]} syntax
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is also supported.  This option affects all the input files that
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follow it.  The offset is added to the input files' timestamps;
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specifying a positive offset means that the corresponding streams are
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delayed by 'offset' seconds.
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@end table
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@section Video Options
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@table @option
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@item -b bitrate
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set the video bitrate in kbit/s (default = 200 kb/s)
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@item -r fps           
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set frame rate (default = 25)
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@item -s size             
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set frame size. The format is @samp{WxH} (default 160x128).  The
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following abbreviations are recognized:
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@table @samp
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@item sqcif
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128x96
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@item qcif
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176x144
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@item cif
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352x288
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@item 4cif
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704x576
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@end table
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@item -aspect aspect
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set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
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@item -croptop size
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set top crop band size (in pixels)
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@item -cropbottom size
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set bottom crop band size (in pixels)
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@item -cropleft size
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set left crop band size (in pixels)
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@item -cropright size
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set right crop band size (in pixels)
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@item -padtop size
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set top pad band size (in pixels)
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@item -padbottom size
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set bottom pad band size (in pixels)
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@item -padleft size
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set left pad band size (in pixels)
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@item -padright size
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set right pad band size (in pixels)
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@item -padcolor (hex color)
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set color of padded bands. The value for pad color is expressed 
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as a six digit hexidecimal number where the first two digits represent red, 
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middle two digits green and last two digits blue. Defaults to 000000 (black)
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@item -vn
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disable video recording
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@item -bt tolerance       
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set video bitrate tolerance (in kbit/s)
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@item -maxrate bitrate
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set max video bitrate tolerance (in kbit/s)
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@item -minrate bitrate
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set min video bitrate tolerance (in kbit/s)
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@item -bufsize size
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set ratecontrol buffere size (in kbit)
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@item -vcodec codec       
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force video codec to @var{codec}. Use the @code{copy} special value to
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tell that the raw codec data must be copied as is.
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@item -sameq
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use same video quality as source (implies VBR)
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@item -pass n  
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select the pass number (1 or 2). It is useful to do two pass
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encoding. The statistics of the video are recorded in the first pass and
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the video at the exact requested bit rate is generated in the second
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pass.
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@item -passlogfile file   
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select two pass log file name to @var{file}.
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@end table
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@section Advanced Video Options
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@table @option
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@item -g gop_size         
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set the group of picture size
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@item -intra              
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use only intra frames
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@item -qscale q           
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use fixed video quantiser scale (VBR)
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@item -qmin q             
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min video quantiser scale (VBR)
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@item -qmax q             
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max video quantiser scale (VBR)
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@item -qdiff q            
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max difference between the quantiser scale (VBR)
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@item -qblur blur         
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video quantiser scale blur (VBR)
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@item -qcomp compression  
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video quantiser scale compression (VBR)
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@item -rc_init_cplx complexity
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initial complexity for 1-pass encoding
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@item -b_qfactor factor
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qp factor between p and b frames
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@item -i_qfactor factor
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qp factor between p and i frames
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@item -b_qoffset offset
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qp offset between p and b frames
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@item -i_qoffset offset
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qp offset between p and i frames
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@item -rc_eq equation
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set rate control equation (@pxref{FFmpeg formula
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evaluator}). Default is @code{tex^qComp}.
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@item -rc_override override
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rate control override for specific intervals
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@item -me method
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set motion estimation method to @var{method}. Available methods are
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(from lower to best quality):
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@table @samp
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@item zero
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Try just the (0, 0) vector.
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@item phods
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@item log
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@item x1
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@item epzs
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(default method)
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@item full
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exhaustive search (slow and marginally better than epzs)
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@end table
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@item -dct_algo algo
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set dct algorithm to @var{algo}. Available values are:
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@table @samp
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@item 0
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FF_DCT_AUTO (default)
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@item 1
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FF_DCT_FASTINT
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@item 2
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FF_DCT_INT
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@item 3
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FF_DCT_MMX
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@item 4
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FF_DCT_MLIB
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@item 5
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FF_DCT_ALTIVEC
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@end table
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@item -idct_algo algo
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set idct algorithm to @var{algo}. Available values are:
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@table @samp
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@item 0
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FF_IDCT_AUTO (default)
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@item 1
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FF_IDCT_INT          
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@item 2
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FF_IDCT_SIMPLE       
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@item 3
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FF_IDCT_SIMPLEMMX    
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@item 4
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FF_IDCT_LIBMPEG2MMX  
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@item 5
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FF_IDCT_PS2          
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@item 6
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FF_IDCT_MLIB         
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@item 7
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FF_IDCT_ARM          
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@item 8
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FF_IDCT_ALTIVEC      
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@item 9
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FF_IDCT_SH4          
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@item 10
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FF_IDCT_SIMPLEARM    
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@end table
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@item -er n
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set error resilience to @var{n}.
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@table @samp
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@item 1 
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FF_ER_CAREFULL (default)
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@item 2
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FF_ER_COMPLIANT
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@item 3
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FF_ER_AGGRESSIVE
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@item 4
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FF_ER_VERY_AGGRESSIVE
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@end table
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@item -ec bit_mask
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set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
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the following values:
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@table @samp
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@item 1
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FF_EC_GUESS_MVS (default=enabled)
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@item 2
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FF_EC_DEBLOCK (default=enabled)
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@end table
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@item -bf frames
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use 'frames' B frames (supported for MPEG-1, MPEG-2 and MPEG-4)
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@item -mbd mode
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macroblock decision
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@table @samp
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@item 0
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FF_MB_DECISION_SIMPLE: use mb_cmp (cannot change it yet in ffmpeg)
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@item 1
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FF_MB_DECISION_BITS: chooses the one which needs the fewest bits
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@item 2
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FF_MB_DECISION_RD: rate distoration
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@end table
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@item -4mv
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use four motion vector by macroblock (only MPEG-4)
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@item -part
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use data partitioning (only MPEG-4)
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@item -bug param
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workaround not auto detected encoder bugs
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@item -strict strictness
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how strictly to follow the standarts
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@item -aic
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enable Advanced intra coding (h263+)
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@item -umv
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enable Unlimited Motion Vector (h263+)
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@item -deinterlace
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deinterlace pictures
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@item -interlace
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force interlacing support in encoder (only MPEG-2 and MPEG-4). Use this option
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if your input file is interlaced and if you want to keep the interlaced
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format for minimum losses. The alternative is to deinterlace the input
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stream with @option{-deinterlace}, but deinterlacing introduces more
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losses.
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@item -psnr
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calculate PSNR of compressed frames
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@item -vstats
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dump video coding statistics to @file{vstats_HHMMSS.log}.
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@item -vhook module
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insert video processing @var{module}. @var{module} contains the module
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name and its parameters separated by spaces.
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@end table
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@section Audio Options
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@table @option
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@item -ar freq    
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set the audio sampling freq (default = 44100 Hz)
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@item -ab bitrate 
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set the audio bitrate in kbit/s (default = 64)
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@item -ac channels
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set the number of audio channels (default = 1)
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@item -an
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disable audio recording
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@item -acodec codec
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force audio codec to @var{codec}. Use the @code{copy} special value to
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tell that the raw codec data must be copied as is.
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@end table
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@section Audio/Video grab options
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@table @option
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@item -vd device
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set video grab device (e.g. @file{/dev/video0})
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@item -vc channel
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set video grab channel (DV1394 only)
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@item -tvstd standard
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set television standard (NTSC, PAL (SECAM))
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@item -dv1394
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set DV1394 grab
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@item -ad device
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set audio device (e.g. @file{/dev/dsp})
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@end table
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@section Advanced options
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@table @option
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@item -map file:stream    
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set input stream mapping
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@item -debug
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print specific debug info
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@item -benchmark          
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add timings for benchmarking
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@item -hex                
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dump each input packet
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@item -bitexact
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only use bit exact algorithms (for codec testing)
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@item -ps size
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set packet size in bits
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@item -re
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read input at native frame rate. Mainly used to simulate a grab device.
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@item -loop
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loop over the input stream. Currently it works only for image
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streams. This option is used for ffserver automatic testing.
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@end table
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@node FFmpeg formula evaluator
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@section FFmpeg formula evaluator
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When evaluating a rate control string, FFmpeg uses an internal formula
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evaluator. 
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The following binary operators are available: @code{+}, @code{-},
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@code{*}, @code{/}, @code{^}.
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The following unary operators are available: @code{+}, @code{-},
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@code{(...)}.
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The following functions are available:
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@table @var
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@item sinh(x)
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@item cosh(x)
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@item tanh(x)
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@item sin(x)
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@item cos(x)
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@item tan(x)
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@item exp(x)
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@item log(x)
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@item squish(x)
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@item gauss(x)
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@item abs(x)
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@item max(x, y)
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@item min(x, y)
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@item gt(x, y)
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@item lt(x, y)
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@item eq(x, y)
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@item bits2qp(bits)
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@item qp2bits(qp)
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@end table
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The following constants are available:
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@table @var
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@item PI
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@item E
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@item iTex
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@item pTex
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@item tex
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@item mv
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@item fCode
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@item iCount
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@item mcVar
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@item var
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@item isI
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@item isP
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@item isB
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@item avgQP
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@item qComp
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@item avgIITex
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@item avgPITex
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@item avgPPTex
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@item avgBPTex
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@item avgTex
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@end table
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@c man end
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@ignore
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@setfilename ffmpeg
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@settitle FFmpeg video converter
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@c man begin SEEALSO
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ffserver(1), ffplay(1) and the html documentation of @file{ffmpeg}.
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@c man end
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@c man begin AUTHOR
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Fabrice Bellard
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@c man end
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@end ignore
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@section Protocols
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The filename can be @file{-} to read from the standard input or to write
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to the standard output.
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ffmpeg handles also many protocols specified with the URL syntax.
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Use 'ffmpeg -formats' to have a list of the supported protocols.
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The protocol @code{http:} is currently used only to communicate with
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ffserver (see the ffserver documentation). When ffmpeg will be a
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video player it will also be used for streaming :-)
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@chapter Tips
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@itemize
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@item For streaming at very low bit rate application, use a low frame rate
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and a small gop size. This is especially true for real video where
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the Linux player does not seem to be very fast, so it can miss
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frames. An example is:
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@example
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ffmpeg -g 3 -r 3 -t 10 -b 50 -s qcif -f rv10 /tmp/b.rm
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@end example
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@item  The parameter 'q' which is displayed while encoding is the current
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quantizer. The value of 1 indicates that a very good quality could
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be achieved. The value of 31 indicates the worst quality. If q=31
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too often, it means that the encoder cannot compress enough to meet
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your bit rate. You must either increase the bit rate, decrease the
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frame rate or decrease the frame size.
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@item If your computer is not fast enough, you can speed up the
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compression at the expense of the compression ratio. You can use
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'-me zero' to speed up motion estimation, and '-intra' to disable
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completely motion estimation (you have only I frames, which means it
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is about as good as JPEG compression).
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@item To have very low bitrates in audio, reduce the sampling frequency
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(down to 22050 kHz for mpeg audio, 22050 or 11025 for ac3).
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@item To have a constant quality (but a variable bitrate), use the option
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'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
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quality).
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@item When converting video files, you can use the '-sameq' option which
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uses in the encoder the same quality factor than in the decoder. It
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allows to be almost lossless in encoding.
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@end itemize
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@chapter Supported File Formats and Codecs
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You can use the @code{-formats} option to have an exhaustive list.
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@section File Formats
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FFmpeg supports the following file formats through the @code{libavformat}
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library:
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@multitable @columnfractions .4 .1 .1
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@item Supported File Format @tab Encoding @tab Decoding @tab Comments
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@item MPEG audio @tab X @tab X
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@item MPEG1 systems @tab X  @tab  X 
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@tab muxed audio and video
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@item MPEG2 PS @tab X  @tab  X 
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@tab also known as @code{VOB} file
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@item MPEG2 TS @tab    @tab  X 
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@tab also known as DVB Transport Stream
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@item ASF@tab X @tab X 
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@item AVI@tab X @tab X 
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@item WAV@tab X @tab X 
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@item Macromedia Flash@tab X @tab X
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@tab Only embedded audio is decoded
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@item FLV              @tab  X @tab X
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@tab Macromedia Flash video files
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@item Real Audio and Video @tab X @tab X 
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@item Raw AC3 @tab X  @tab  X 
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@item Raw MJPEG @tab X  @tab  X 
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@item Raw MPEG video @tab X  @tab  X 
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@item Raw PCM8/16 bits, mulaw/Alaw@tab X  @tab  X 
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@item Raw CRI ADX audio @tab X  @tab  X 
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@item Raw Shorten audio @tab    @tab  X 
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@item SUN AU format @tab X  @tab  X 
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@item NUT @tab X @tab X @tab NUT Open Container Format
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@item Quicktime        @tab X @tab  X 
664
@item MPEG4            @tab X @tab  X 
665
@tab MPEG4 is a variant of Quicktime
666
@item Raw MPEG4 video  @tab  X @tab  X 
667
@item DV               @tab  X @tab  X
668
@item 4xm              @tab    @tab X
669
@tab 4X Technologies format, used in some games
670
@item Playstation STR  @tab    @tab X
671
@item Id RoQ           @tab    @tab X
672
@tab used in Quake III, Jedi Knight 2, other computer games
673
@item Interplay MVE    @tab    @tab X
674
@tab format used in various Interplay computer games
675
@item WC3 Movie        @tab    @tab X
676
@tab multimedia format used in Origin's Wing Commander III computer game
677
@item Sega FILM/CPK    @tab    @tab X
678
@tab used in many Sega Saturn console games
679
@item Westwood Studios VQA/AUD  @tab    @tab X
680
@tab Multimedia formats used in Westwood Studios games
681
@item Id Cinematic (.cin) @tab    @tab X
682
@tab Used in Quake II
683
@item FLIC format      @tab    @tab X
684
@tab .fli/.flc files
685
@item Sierra VMD       @tab    @tab X
686
@tab used in Sierra CD-ROM games
687
@item Sierra Online    @tab    @tab X
688
@tab .sol files used in Sierra Online games
689
@item Matroska         @tab    @tab X
690
@item Electronic Arts Multimedia    @tab    @tab X
691
@tab used in various EA games; files have extensions like WVE and UV2
692
@item Nullsoft Video (NSV) format @tab    @tab X
693
@end multitable
694

    
695
@code{X} means that the encoding (resp. decoding) is supported.
696

    
697
@section Image Formats
698

    
699
FFmpeg can read and write images for each frame of a video sequence. The
700
following image formats are supported:
701

    
702
@multitable @columnfractions .4 .1 .1
703
@item Supported Image Format @tab Encoding @tab Decoding @tab Comments
704
@item PGM, PPM     @tab X @tab X 
705
@item PAM          @tab X @tab X @tab PAM is a PNM extension with alpha support
706
@item PGMYUV       @tab X @tab X @tab PGM with U and V components in YUV 4:2:0
707
@item JPEG         @tab X @tab X @tab Progressive JPEG is not supported
708
@item .Y.U.V       @tab X @tab X @tab One raw file per component
709
@item Animated GIF @tab X @tab X @tab Only uncompressed GIFs are generated
710
@item PNG          @tab X @tab X @tab 2 bit and 4 bit/pixel not supported yet
711
@item SGI          @tab X @tab X @tab SGI RGB image format
712
@end multitable
713

    
714
@code{X} means that the encoding (resp. decoding) is supported.
715

    
716
@section Video Codecs
717

    
718
@multitable @columnfractions .4 .1 .1 .7
719
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
720
@item MPEG1 video            @tab  X  @tab  X
721
@item MPEG2 video            @tab  X  @tab  X 
722
@item MPEG4                  @tab  X  @tab  X @tab Also known as DIVX4/5
723
@item MSMPEG4 V1             @tab  X  @tab  X
724
@item MSMPEG4 V2             @tab  X  @tab  X
725
@item MSMPEG4 V3             @tab  X  @tab  X @tab Also known as DIVX3
726
@item WMV7                   @tab  X  @tab  X
727
@item WMV8                   @tab  X  @tab  X @tab Not completely working
728
@item H.261                  @tab  X  @tab  X
729
@item H.263(+)               @tab  X  @tab  X @tab Also known as Real Video 1.0
730
@item H.264                  @tab     @tab  X
731
@item MJPEG                  @tab  X  @tab  X 
732
@item Lossless MJPEG         @tab  X  @tab  X
733
@item Apple MJPEG-B          @tab     @tab  X
734
@item Sunplus MJPEG          @tab     @tab  X @tab fourcc: SP5X
735
@item DV                     @tab  X  @tab  X 
736
@item Huff YUV               @tab  X  @tab  X
737
@item FFmpeg Video 1         @tab  X  @tab  X @tab Experimental lossless codec (fourcc: FFV1)
738
@item FFmpeg Snow            @tab  X  @tab  X @tab Experimental wavelet codec (fourcc: SNOW)
739
@item Asus v1                @tab  X  @tab  X @tab fourcc: ASV1
740
@item Asus v2                @tab  X  @tab  X @tab fourcc: ASV2
741
@item Creative YUV           @tab     @tab  X @tab fourcc: CYUV
742
@item Sorenson Video 1       @tab  X  @tab  X @tab fourcc: SVQ1
743
@item Sorenson Video 3       @tab     @tab  X @tab fourcc: SVQ3
744
@item On2 VP3                @tab     @tab  X @tab still experimental
745
@item Theora                 @tab     @tab  X @tab still experimental
746
@item Intel Indeo 3          @tab     @tab  X
747
@item FLV                    @tab  X  @tab  X @tab Sorenson H.263 used in Flash
748
@item ATI VCR1               @tab     @tab  X @tab fourcc: VCR1
749
@item ATI VCR2               @tab     @tab  X @tab fourcc: VCR2
750
@item Cirrus Logic AccuPak   @tab     @tab  X @tab fourcc: CLJR
751
@item 4X Video               @tab     @tab  X @tab used in certain computer games
752
@item Sony Playstation MDEC  @tab     @tab  X 
753
@item Id RoQ                 @tab     @tab  X @tab used in Quake III, Jedi Knight 2, other computer games
754
@item Xan/WC3                @tab     @tab  X @tab used in Wing Commander III .MVE files
755
@item Interplay Video        @tab     @tab  X @tab used in Interplay .MVE files
756
@item Apple Animation        @tab     @tab  X @tab fourcc: 'rle '
757
@item Apple Graphics         @tab     @tab  X @tab fourcc: 'smc '
758
@item Apple Video            @tab     @tab  X @tab fourcc: rpza
759
@item Apple QuickDraw        @tab     @tab  X @tab fourcc: qdrw
760
@item Cinepak                @tab     @tab  X
761
@item Microsoft RLE          @tab     @tab  X
762
@item Microsoft Video-1      @tab     @tab  X
763
@item Westwood VQA           @tab     @tab  X
764
@item Id Cinematic Video     @tab     @tab  X @tab used in Quake II
765
@item Planar RGB             @tab     @tab  X @tab fourcc: 8BPS
766
@item FLIC video             @tab     @tab  X
767
@item Duck TrueMotion v1     @tab     @tab  X @tab fourcc: DUCK
768
@item VMD Video              @tab     @tab  X @tab used in Sierra VMD files
769
@item MSZH                   @tab     @tab  X @tab Part of LCL
770
@item ZLIB                   @tab  X  @tab  X @tab Part of LCL, encoder experimental
771
@item TechSmith Camtasia     @tab     @tab  X @tab fourcc: TSCC
772
@item IBM Ultimotion         @tab     @tab  X @tab fourcc: ULTI
773
@item Miro VideoXL           @tab     @tab  X @tab fourcc: VIXL
774
@item QPEG                   @tab     @tab  X @tab fourccs: QPEG, Q1.0, Q1.1
775
@item LOCO                   @tab     @tab  X @tab 
776
@item Winnov WNV1            @tab     @tab  X @tab 
777
@item Autodesk Animator Studio Codec  @tab     @tab  X @tab fourcc: AASC
778
@end multitable
779

    
780
@code{X} means that the encoding (resp. decoding) is supported.
781

    
782
Check at @url{http://www.mplayerhq.hu/~michael/codec-features.html} to
783
get a precise comparison of FFmpeg MPEG4 codec compared to the other
784
solutions.
785

    
786
@section Audio Codecs
787

    
788
@multitable @columnfractions .4 .1 .1 .1 .7
789
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
790
@item MPEG audio layer 2     @tab  IX  @tab  IX 
791
@item MPEG audio layer 1/3   @tab IX   @tab  IX
792
@tab MP3 encoding is supported through the external library LAME
793
@item AC3                    @tab  IX  @tab  IX
794
@tab liba52 is used internally for decoding
795
@item Vorbis                 @tab  X   @tab  X
796
@tab supported through the external library libvorbis
797
@item WMA V1/V2              @tab      @tab X
798
@item AAC                    @tab X    @tab X
799
@tab supported through the external library libfaac/libfaad
800
@item Microsoft ADPCM        @tab X    @tab X
801
@item MS IMA ADPCM           @tab X    @tab X
802
@item QT IMA ADPCM           @tab      @tab X
803
@item 4X IMA ADPCM           @tab      @tab X
804
@item G.726  ADPCM           @tab X    @tab X
805
@item Duck DK3 IMA ADPCM     @tab      @tab X
806
@tab used in some Sega Saturn console games
807
@item Duck DK4 IMA ADPCM     @tab      @tab X
808
@tab used in some Sega Saturn console games
809
@item Westwood Studios IMA ADPCM @tab      @tab X
810
@tab used in Westwood Studios games like Command and Conquer
811
@item SMJPEG IMA ADPCM       @tab      @tab X
812
@tab used in certain Loki game ports
813
@item CD-ROM XA ADPCM        @tab      @tab X
814
@item CRI ADX ADPCM          @tab X    @tab X
815
@tab used in Sega Dreamcast games
816
@item Electronic Arts ADPCM  @tab      @tab X
817
@tab used in various EA titles
818
@item Creative ADPCM         @tab      @tab X
819
@item RA144                  @tab      @tab X
820
@tab Real 14400 bit/s codec
821
@item RA288                  @tab      @tab X
822
@tab Real 28800 bit/s codec
823
@item RADnet                 @tab X    @tab IX
824
@tab Real lowbitrate AC3 codec, liba52 is used for decoding
825
@item AMR-NB                 @tab X    @tab X
826
@tab supported through an external library
827
@item AMR-WB                 @tab X    @tab X
828
@tab supported through an external library
829
@item DV audio               @tab      @tab X
830
@item Id RoQ DPCM            @tab      @tab X
831
@tab used in Quake III, Jedi Knight 2, other computer games
832
@item Interplay MVE DPCM     @tab      @tab X
833
@tab used in various Interplay computer games
834
@item Xan DPCM               @tab      @tab X
835
@tab used in Origin's Wing Commander IV AVI files
836
@item Sierra Online DPCM     @tab      @tab X
837
@tab used in Sierra Online game audio files
838
@item Apple MACE 3           @tab      @tab X
839
@item Apple MACE 6           @tab      @tab X
840
@item FLAC lossless audio    @tab      @tab X
841
@item Shorten lossless audio @tab      @tab X
842
@item Apple lossless audio   @tab      @tab X
843
@tab QuickTime fourcc 'alac'
844
@item FFmpeg Sonic           @tab X    @tab X
845
@tab Experimental lossy/lossless codec
846
@end multitable
847

    
848
@code{X} means that the encoding (resp. decoding) is supported.
849

    
850
@code{I} means that an integer only version is available too (ensures highest
851
performances on systems without hardware floating point support).
852

    
853
@chapter Platform Specific information
854

    
855
@section Linux
856

    
857
ffmpeg should be compiled with at least GCC 2.95.3. GCC 3.2 is the
858
preferred compiler now for ffmpeg. All future optimizations will depend on
859
features only found in GCC 3.2.
860

    
861
@section BSD
862

    
863
@section Windows
864

    
865
@subsection Native Windows compilation
866

    
867
@itemize
868
@item Install the current versions of MSYS and MinGW from
869
@url{http://www.mingw.org/}. You can find detailed installation
870
instructions in the download section and the FAQ.
871

    
872
@item If you want to test the FFmpeg Simple Media Player, also download 
873
the MinGW development library of SDL 1.2.x
874
(@file{SDL-devel-1.2.x-mingw32.tar.gz}) from
875
@url{http://www.libsdl.org}. Unpack it in a temporary place, and
876
unpack the archive @file{i386-mingw32msvc.tar.gz} in the MinGW tool
877
directory. Edit the @file{sdl-config} script so that it gives the
878
correct SDL directory when invoked.
879

    
880
@item Extract the current version of FFmpeg (the latest release version or the current CVS snapshot whichever is recommended).
881
 
882
@item Start the MSYS shell (file @file{msys.bat}).
883

    
884
@item Change to the FFMPEG directory and follow
885
 the instructions of how to compile ffmpeg (file
886
@file{INSTALL}). Usually, launching @file{./configure} and @file{make}
887
suffices. If you have problems using SDL, verify that
888
@file{sdl-config} can be launched from the MSYS command line.
889

    
890
@item You can install FFmpeg in @file{Program Files/FFmpeg} by typing @file{make install}. Don't forget to copy @file{SDL.dll} at the place you launch 
891
@file{ffplay}.
892

    
893
@end itemize
894

    
895
Notes: 
896
@itemize
897

    
898
@item The target @file{make wininstaller} can be used to create a
899
Nullsoft based Windows installer for FFmpeg and FFplay. @file{SDL.dll}
900
must be copied in the ffmpeg directory in order to build the
901
installer.
902

    
903
@item By using @code{./configure --enable-shared} when configuring ffmpeg, 
904
you can build @file{avcodec.dll} and @file{avformat.dll}. With
905
@code{make install} you install the FFmpeg DLLs and the associated
906
headers in @file{Program Files/FFmpeg}. 
907

    
908
@item Visual C++ compatibility: if you used @code{./configure --enable-shared} 
909
when configuring FFmpeg, then FFmpeg tries to use the Microsoft Visual
910
C++ @code{lib} tool to build @code{avcodec.lib} and
911
@code{avformat.lib}. With these libraries, you can link your Visual C++
912
code directly with the FFmpeg DLLs.
913

    
914
@end itemize
915

    
916
@subsection Cross compilation for Windows with Linux
917

    
918
You must use the MinGW cross compilation tools available at
919
@url{http://www.mingw.org/}.
920

    
921
Then configure ffmpeg with the following options:
922
@example
923
./configure --enable-mingw32 --cross-prefix=i386-mingw32msvc-
924
@end example
925
(you can change the cross-prefix according to the prefix choosen for the
926
MinGW tools).
927

    
928
Then you can easily test ffmpeg with wine
929
(@url{http://www.winehq.com/}).
930

    
931
@section MacOS X
932

    
933
@section BeOS
934

    
935
The configure script should guess the configuration itself.
936
Networking support is currently not finished.
937
errno issues fixed by Andrew Bachmann.
938

    
939
Old stuff:
940

    
941
Fran?ois Revol - revol at free dot fr - April 2002
942

    
943
The configure script should guess the configuration itself, 
944
however I still didn't tested building on net_server version of BeOS.
945

    
946
ffserver is broken (needs poll() implementation).
947

    
948
There is still issues with errno codes, which are negative in BeOs, and
949
that ffmpeg negates when returning. This ends up turning errors into 
950
valid results, then crashes.
951
(To be fixed)
952

    
953
@chapter Developers Guide
954

    
955
@section API
956
@itemize
957
@item libavcodec is the library containing the codecs (both encoding and
958
  decoding). See @file{libavcodec/apiexample.c} to see how to use it.
959

    
960
@item libavformat is the library containing the file formats handling (mux and
961
  demux code for several formats). See @file{ffplay.c} to use it in a
962
player. See @file{output_example.c} to use it to generate audio or video
963
streams.
964

    
965
@end itemize
966

    
967
@section Integrating libavcodec or libavformat in your program
968

    
969
You can integrate all the source code of the libraries to link them
970
statically to avoid any version problem. All you need is to provide a
971
'config.mak' and a 'config.h' in the parent directory. See the defines
972
generated by ./configure to understand what is needed.
973

    
974
You can use libavcodec or libavformat in your commercial program, but
975
@emph{any patch you make must be published}. The best way to proceed is
976
to send your patches to the ffmpeg mailing list.
977

    
978
@node Coding Rules
979
@section Coding Rules
980

    
981
ffmpeg is programmed in the ISO C90 language with a few additional
982
features from ISO C99, namely:
983
@itemize @bullet
984
@item
985
the @samp{inline} keyword;
986
@item
987
@samp{//} comments;
988
@item
989
designated struct initializers (@samp{struct s x = @{ .i = 17 @};})
990
@item
991
compound literals (@samp{x = (struct s) @{ 17, 23 @};})
992
@end itemize
993

    
994
These features are supported by all compilers we care about, so we won't
995
accept patches to remove their use unless they absolutely don't impair
996
clarity and performance.
997

    
998
All code must compile with gcc 2.95 and gcc 3.3. Currently, ffmpeg also
999
compiles with several other compilers, such as the Compaq ccc compiler
1000
or Sun Studio 9, and we would like to keep it that way unless it would
1001
be exceedingly involved. To ensure compatibility, please don't use any
1002
additional C99 features or gcc extensions. Watch out especially for:
1003
@itemize @bullet
1004
@item
1005
mixing statements and declarations;
1006
@item
1007
@samp{long long} (use @samp{int64_t} instead);
1008
@item
1009
@samp{__attribute__} not protected by @samp{#ifdef __GNUC__} or similar;
1010
@item
1011
gcc statement expressions (@samp{(x = (@{ int y = 4; y; @})}).
1012
@end itemize
1013

    
1014
Indent size is 4. The TAB character should not be used.
1015
The presentation is the one specified by 'indent -i4 -kr'.
1016

    
1017
Main priority in ffmpeg is simplicity and small code size (=less
1018
bugs).
1019

    
1020
Comments: use the JavaDoc/Doxygen 
1021
format (see examples below) so that a documentation
1022
can be generated automatically. All non trivial functions should have a comment
1023
above it explaining what the function does, even if its just one sentance.
1024
All Structures and their member variables should be documented too.
1025
@example
1026
/**
1027
?* @@file mpeg.c
1028
?* mpeg codec.
1029
?* @@author ...
1030
?*/
1031

    
1032
/**
1033
?* Summary sentance.
1034
?* more text ...
1035
?* ...
1036
?*/
1037
typedef struct Foobar@{
1038
? ? int var1; /**< var1 description */
1039
? ? int var2; ///< var2 description
1040
? ? /** var3 description */
1041
? ? int var3;
1042
@} Foobar;
1043

    
1044
/**
1045
?* Summary sentance.
1046
?* more text ...
1047
?* ...
1048
?* @@param my_parameter description of my_parameter
1049
?* @@return return value description
1050
?*/
1051
int myfunc(int my_parameter)
1052
...
1053
@end example
1054

    
1055
fprintf and printf are forbidden in libavformat and libavcodec, 
1056
please use av_log() instead.
1057

    
1058
@node CVS Policy
1059
@section CVS Policy
1060

    
1061
@enumerate
1062
@item 
1063
   You must not commit code which breaks FFmpeg! (Meaning unfinished but
1064
   enabled code which breaks compilation or compiles but does not work. Or 
1065
   breaks the regression tests)
1066
   You can commit unfinished stuff (for testing etc), but it must be disabled
1067
   (#ifdef etc) by default so it does not interfere with other developers'
1068
   work.
1069
@item 
1070
   You don't have to over-test things. If it works for you, and you think it
1071
   should work for others, too, then commit. If your code has problems
1072
   (portability, exploits compiler bugs, unusual environment etc) they will be
1073
   reported and eventually fixed.
1074
@item 
1075
   Do not commit unrelated changes together, split them into self-contained
1076
   pieces.
1077
@item
1078
   Do not change behavior of the program (renaming options etc) without
1079
   first discussing it on the ffmpeg-dev mailing list. Do not remove
1080
   functionality from the code. Just improve!
1081
   
1082
   Note: Redundant code can be removed
1083
@item
1084
   Do not commit changes to the build system (Makefiles, configure script)
1085
   which change behaviour, defaults etc, without asking first. The same
1086
   applies to compiler warning fixes, trivial looking fixes and to code
1087
   maintained by other developers. We usually have a reason for doing things
1088
   the way we do. Send your changes as patches to the ffmpeg-dev mailing
1089
   list, and if the code maintainers say OK, you may commit. This does not
1090
   apply to files you wrote and/or maintain.
1091
@item
1092
   We refuse source indentation and other cosmetic changes if they are mixed
1093
   with functional changes, such commits will be rejected and removed. Every
1094
   developer has his own indentation style, you should not change it. Of course
1095
   if you (re)write something, you can use your own style, even though we would
1096
   prefer if the indention throughout ffmpeg would be consistant (Many projects
1097
   force a given indentation style - we don't.) If you really need to make
1098
   indentation changes (try to avoid this), separate them strictly from real
1099
   changes.
1100

    
1101
   NOTE: If you had to put if()@{ .. @} over a large (> 5 lines) chunk of code,
1102
   then either do NOT change the indentation of the inner part within (don't 
1103
   move it to the right)! or do so in a seperate commit
1104
@item
1105
   Always fill out the commit log message. Describe in a few lines what you
1106
   changed and why. You can refer to mailing list postings if you fix a
1107
   particular bug. Comments such as "fixed!" or "Changed it." are unacceptable.
1108
@item
1109
   If you apply a patch by someone else, include the name and email address in
1110
   the CVS log message. Since the ffmpeg-cvslog mailing list is publicly
1111
   archived you should add some spam protection to the email address. Send an
1112
   answer to ffmpeg-dev (or wherever you got the patch from) saying that
1113
   you applied the patch.
1114
@item
1115
   Do NOT commit to code actively maintained by others without permission. Send
1116
   a patch to ffmpeg-dev instead.
1117
@item
1118
    Subscribe to the ffmpeg-cvslog mailing list. The diffs of all CVS commits
1119
    are sent there and reviewed by all the other developers. Bugs and possible
1120
    improvements or general questions regarding commits are discussed there. We
1121
    expect you to react if problems with your code are uncovered.
1122
@item
1123
    Update the documentation if you change behavior or add features. If you are
1124
    unsure how best to do this, send a patch to ffmpeg-dev, the documentation
1125
    maintainer(s) will review and commit your stuff.
1126
@item
1127
    Revert a commit ONLY in case of a big blunder like committing something not
1128
    intended to be committed or committing a wrong file, the wrong version of a
1129
    patch, cvs policy violation or broken code and you are going to recommit the
1130
    right thing immediately.
1131

    
1132
    Never revert changes made a long time ago or buggy code. Fix it in the
1133
    normal way instead.
1134
@item
1135
    Never write to not allocated memory, never write over the end of arrays, 
1136
    always check values read from some untrusted source before using them as index
1137
    into an array or otherwise risky things.
1138
@end enumerate
1139

    
1140
We think our rules are not too hard. If you have comments, contact us.
1141

    
1142
Note, these rules are mostly borrowed from the MPlayer project.
1143

    
1144
@subsection Renaming/moving files or content of files
1145
  You CANNOT do that. Post a request for such a change to the mailinglist
1146
  Do NOT remove & readd a file - it will kill the changelog!!!!
1147

    
1148
@section Submitting patches
1149

    
1150
First, (@pxref{Coding Rules}) above if you didn't yet.
1151

    
1152
When you submit your patch, try to send a unified diff (diff '-up'
1153
option). I cannot read other diffs :-)
1154

    
1155
Run the regression tests before submitting a patch so that you can
1156
verify that there are no big problems.
1157

    
1158
Patches should be posted as base64 encoded attachments (or any other
1159
encoding which ensures that the patch wont be trashed during 
1160
transmission) to the ffmpeg-devel mailinglist, see 
1161
@url{http://www1.mplayerhq.hu/mailman/listinfo/ffmpeg-devel}
1162

    
1163
It also helps quite a bit if you tell us what the patch does (for example
1164
'replaces lrint by lrintf') , and why (for example '*bsd isnt c99 compliant
1165
and has no lrint()')
1166

    
1167
We reply to all patches submitted and either apply or reject with some
1168
explanation why, but sometimes we are quite busy so it can take a week or 2
1169

    
1170
@section Regression tests
1171

    
1172
Before submitting a patch (or committing with CVS), you should at least
1173
test that you did not break anything.
1174

    
1175
The regression test build a synthetic video stream and a synthetic
1176
audio stream. Then these are encoded then decoded with all codecs or
1177
formats. The CRC (or MD5) of each generated file is recorded in a
1178
result file. Then a 'diff' is launched with the reference results and
1179
the result file.
1180

    
1181
The regression test then goes on to test the ffserver code with a 
1182
limited set of streams. It is important that this step runs correctly
1183
as well.
1184

    
1185
Run 'make test' to test all the codecs and formats.
1186

    
1187
Run 'make fulltest' to test all the codecs, formats and ffserver.
1188

    
1189
[Of course, some patches may change the regression tests results. In
1190
this case, the regression tests reference results shall be modified
1191
accordingly].
1192

    
1193
@bye