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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
@end multitable
778

    
779
@code{X} means that the encoding (resp. decoding) is supported.
780

    
781
Check at @url{http://www.mplayerhq.hu/~michael/codec-features.html} to
782
get a precise comparison of FFmpeg MPEG4 codec compared to the other
783
solutions.
784

    
785
@section Audio Codecs
786

    
787
@multitable @columnfractions .4 .1 .1 .1 .7
788
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
789
@item MPEG audio layer 2     @tab  IX  @tab  IX 
790
@item MPEG audio layer 1/3   @tab IX   @tab  IX
791
@tab MP3 encoding is supported through the external library LAME
792
@item AC3                    @tab  IX  @tab  IX
793
@tab liba52 is used internally for decoding
794
@item Vorbis                 @tab  X   @tab  X
795
@tab supported through the external library libvorbis
796
@item WMA V1/V2              @tab      @tab X
797
@item AAC                    @tab X    @tab X
798
@tab supported through the external library libfaac/libfaad
799
@item Microsoft ADPCM        @tab X    @tab X
800
@item MS IMA ADPCM           @tab X    @tab X
801
@item QT IMA ADPCM           @tab      @tab X
802
@item 4X IMA ADPCM           @tab      @tab X
803
@item G.726  ADPCM           @tab X    @tab X
804
@item Duck DK3 IMA ADPCM     @tab      @tab X
805
@tab used in some Sega Saturn console games
806
@item Duck DK4 IMA ADPCM     @tab      @tab X
807
@tab used in some Sega Saturn console games
808
@item Westwood Studios IMA ADPCM @tab      @tab X
809
@tab used in Westwood Studios games like Command and Conquer
810
@item SMJPEG IMA ADPCM       @tab      @tab X
811
@tab used in certain Loki game ports
812
@item CD-ROM XA ADPCM        @tab      @tab X
813
@item CRI ADX ADPCM          @tab X    @tab X
814
@tab used in Sega Dreamcast games
815
@item Electronic Arts ADPCM  @tab      @tab X
816
@tab used in various EA titles
817
@item Creative ADPCM         @tab      @tab X
818
@item RA144                  @tab      @tab X
819
@tab Real 14400 bit/s codec
820
@item RA288                  @tab      @tab X
821
@tab Real 28800 bit/s codec
822
@item RADnet                 @tab X    @tab IX
823
@tab Real lowbitrate AC3 codec, liba52 is used for decoding
824
@item AMR-NB                 @tab X    @tab X
825
@tab supported through an external library
826
@item AMR-WB                 @tab X    @tab X
827
@tab supported through an external library
828
@item DV audio               @tab      @tab X
829
@item Id RoQ DPCM            @tab      @tab X
830
@tab used in Quake III, Jedi Knight 2, other computer games
831
@item Interplay MVE DPCM     @tab      @tab X
832
@tab used in various Interplay computer games
833
@item Xan DPCM               @tab      @tab X
834
@tab used in Origin's Wing Commander IV AVI files
835
@item Sierra Online DPCM     @tab      @tab X
836
@tab used in Sierra Online game audio files
837
@item Apple MACE 3           @tab      @tab X
838
@item Apple MACE 6           @tab      @tab X
839
@item FLAC lossless audio    @tab      @tab X
840
@item Shorten lossless audio @tab      @tab X
841
@item Apple lossless audio   @tab      @tab X
842
@tab QuickTime fourcc 'alac'
843
@item FFmpeg Sonic           @tab X    @tab X
844
@tab Experimental lossy/lossless codec
845
@end multitable
846

    
847
@code{X} means that the encoding (resp. decoding) is supported.
848

    
849
@code{I} means that an integer only version is available too (ensures highest
850
performances on systems without hardware floating point support).
851

    
852
@chapter Platform Specific information
853

    
854
@section Linux
855

    
856
ffmpeg should be compiled with at least GCC 2.95.3. GCC 3.2 is the
857
preferred compiler now for ffmpeg. All future optimizations will depend on
858
features only found in GCC 3.2.
859

    
860
@section BSD
861

    
862
@section Windows
863

    
864
@subsection Native Windows compilation
865

    
866
@itemize
867
@item Install the current versions of MSYS and MinGW from
868
@url{http://www.mingw.org/}. You can find detailed installation
869
instructions in the download section and the FAQ.
870

    
871
@item If you want to test the FFmpeg Simple Media Player, also download 
872
the MinGW development library of SDL 1.2.x
873
(@file{SDL-devel-1.2.x-mingw32.tar.gz}) from
874
@url{http://www.libsdl.org}. Unpack it in a temporary place, and
875
unpack the archive @file{i386-mingw32msvc.tar.gz} in the MinGW tool
876
directory. Edit the @file{sdl-config} script so that it gives the
877
correct SDL directory when invoked.
878

    
879
@item Extract the current version of FFmpeg (the latest release version or the current CVS snapshot whichever is recommended).
880
 
881
@item Start the MSYS shell (file @file{msys.bat}).
882

    
883
@item Change to the FFMPEG directory and follow
884
 the instructions of how to compile ffmpeg (file
885
@file{INSTALL}). Usually, launching @file{./configure} and @file{make}
886
suffices. If you have problems using SDL, verify that
887
@file{sdl-config} can be launched from the MSYS command line.
888

    
889
@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 
890
@file{ffplay}.
891

    
892
@end itemize
893

    
894
Notes: 
895
@itemize
896

    
897
@item The target @file{make wininstaller} can be used to create a
898
Nullsoft based Windows installer for FFmpeg and FFplay. @file{SDL.dll}
899
must be copied in the ffmpeg directory in order to build the
900
installer.
901

    
902
@item By using @code{./configure --enable-shared} when configuring ffmpeg, 
903
you can build @file{avcodec.dll} and @file{avformat.dll}. With
904
@code{make install} you install the FFmpeg DLLs and the associated
905
headers in @file{Program Files/FFmpeg}. 
906

    
907
@item Visual C++ compatibility: if you used @code{./configure --enable-shared} 
908
when configuring FFmpeg, then FFmpeg tries to use the Microsoft Visual
909
C++ @code{lib} tool to build @code{avcodec.lib} and
910
@code{avformat.lib}. With these libraries, you can link your Visual C++
911
code directly with the FFmpeg DLLs.
912

    
913
@end itemize
914

    
915
@subsection Cross compilation for Windows with Linux
916

    
917
You must use the MinGW cross compilation tools available at
918
@url{http://www.mingw.org/}.
919

    
920
Then configure ffmpeg with the following options:
921
@example
922
./configure --enable-mingw32 --cross-prefix=i386-mingw32msvc-
923
@end example
924
(you can change the cross-prefix according to the prefix choosen for the
925
MinGW tools).
926

    
927
Then you can easily test ffmpeg with wine
928
(@url{http://www.winehq.com/}).
929

    
930
@section MacOS X
931

    
932
@section BeOS
933

    
934
The configure script should guess the configuration itself.
935
Networking support is currently not finished.
936
errno issues fixed by Andrew Bachmann.
937

    
938
Old stuff:
939

    
940
Fran?ois Revol - revol at free dot fr - April 2002
941

    
942
The configure script should guess the configuration itself, 
943
however I still didn't tested building on net_server version of BeOS.
944

    
945
ffserver is broken (needs poll() implementation).
946

    
947
There is still issues with errno codes, which are negative in BeOs, and
948
that ffmpeg negates when returning. This ends up turning errors into 
949
valid results, then crashes.
950
(To be fixed)
951

    
952
@chapter Developers Guide
953

    
954
@section API
955
@itemize
956
@item libavcodec is the library containing the codecs (both encoding and
957
  decoding). See @file{libavcodec/apiexample.c} to see how to use it.
958

    
959
@item libavformat is the library containing the file formats handling (mux and
960
  demux code for several formats). See @file{ffplay.c} to use it in a
961
player. See @file{output_example.c} to use it to generate audio or video
962
streams.
963

    
964
@end itemize
965

    
966
@section Integrating libavcodec or libavformat in your program
967

    
968
You can integrate all the source code of the libraries to link them
969
statically to avoid any version problem. All you need is to provide a
970
'config.mak' and a 'config.h' in the parent directory. See the defines
971
generated by ./configure to understand what is needed.
972

    
973
You can use libavcodec or libavformat in your commercial program, but
974
@emph{any patch you make must be published}. The best way to proceed is
975
to send your patches to the ffmpeg mailing list.
976

    
977
@node Coding Rules
978
@section Coding Rules
979

    
980
ffmpeg is programmed in the ISO C90 language with a few additional
981
features from ISO C99, namely:
982
@itemize @bullet
983
@item
984
the @samp{inline} keyword;
985
@item
986
@samp{//} comments;
987
@item
988
designated struct initializers (@samp{struct s x = @{ .i = 17 @};})
989
@item
990
compound literals (@samp{x = (struct s) @{ 17, 23 @};})
991
@end itemize
992

    
993
These features are supported by all compilers we care about, so we won't
994
accept patches to remove their use unless they absolutely don't impair
995
clarity and performance.
996

    
997
All code must compile with gcc 2.95 and gcc 3.3. Currently, ffmpeg also
998
compiles with several other compilers, such as the Compaq ccc compiler
999
or Sun Studio 9, and we would like to keep it that way unless it would
1000
be exceedingly involved. To ensure compatibility, please don't use any
1001
additional C99 features or gcc extensions. Watch out especially for:
1002
@itemize @bullet
1003
@item
1004
mixing statements and declarations;
1005
@item
1006
@samp{long long} (use @samp{int64_t} instead);
1007
@item
1008
@samp{__attribute__} not protected by @samp{#ifdef __GNUC__} or similar;
1009
@item
1010
gcc statement expressions (@samp{(x = (@{ int y = 4; y; @})}).
1011
@end itemize
1012

    
1013
Indent size is 4. The TAB character should not be used.
1014
The presentation is the one specified by 'indent -i4 -kr'.
1015

    
1016
Main priority in ffmpeg is simplicity and small code size (=less
1017
bugs).
1018

    
1019
Comments: use the JavaDoc/Doxygen 
1020
format (see examples below) so that a documentation
1021
can be generated automatically. All non trivial functions should have a comment
1022
above it explaining what the function does, even if its just one sentance.
1023
All Structures and their member variables should be documented too.
1024
@example
1025
/**
1026
?* @@file mpeg.c
1027
?* mpeg codec.
1028
?* @@author ...
1029
?*/
1030

    
1031
/**
1032
?* Summary sentance.
1033
?* more text ...
1034
?* ...
1035
?*/
1036
typedef struct Foobar@{
1037
? ? int var1; /**< var1 description */
1038
? ? int var2; ///< var2 description
1039
? ? /** var3 description */
1040
? ? int var3;
1041
@} Foobar;
1042

    
1043
/**
1044
?* Summary sentance.
1045
?* more text ...
1046
?* ...
1047
?* @@param my_parameter description of my_parameter
1048
?* @@return return value description
1049
?*/
1050
int myfunc(int my_parameter)
1051
...
1052
@end example
1053

    
1054
fprintf and printf are forbidden in libavformat and libavcodec, 
1055
please use av_log() instead.
1056

    
1057
@node CVS Policy
1058
@section CVS Policy
1059

    
1060
@enumerate
1061
@item 
1062
   You must not commit code which breaks FFmpeg! (Meaning unfinished but
1063
   enabled code which breaks compilation or compiles but does not work. Or 
1064
   breaks the regression tests)
1065
   You can commit unfinished stuff (for testing etc), but it must be disabled
1066
   (#ifdef etc) by default so it does not interfere with other developers'
1067
   work.
1068
@item 
1069
   You don't have to over-test things. If it works for you, and you think it
1070
   should work for others, too, then commit. If your code has problems
1071
   (portability, exploits compiler bugs, unusual environment etc) they will be
1072
   reported and eventually fixed.
1073
@item 
1074
   Do not commit unrelated changes together, split them into self-contained
1075
   pieces.
1076
@item
1077
   Do not change behavior of the program (renaming options etc) without
1078
   first discussing it on the ffmpeg-dev mailing list. Do not remove
1079
   functionality from the code. Just improve!
1080
   
1081
   Note: Redundant code can be removed
1082
@item
1083
   Do not commit changes to the build system (Makefiles, configure script)
1084
   which change behaviour, defaults etc, without asking first. The same
1085
   applies to compiler warning fixes, trivial looking fixes and to code
1086
   maintained by other developers. We usually have a reason for doing things
1087
   the way we do. Send your changes as patches to the ffmpeg-dev mailing
1088
   list, and if the code maintainers say OK, you may commit. This does not
1089
   apply to files you wrote and/or maintain.
1090
@item
1091
   We refuse source indentation and other cosmetic changes if they are mixed
1092
   with functional changes, such commits will be rejected and removed. Every
1093
   developer has his own indentation style, you should not change it. Of course
1094
   if you (re)write something, you can use your own style, even though we would
1095
   prefer if the indention throughout ffmpeg would be consistant (Many projects
1096
   force a given indentation style - we don't.) If you really need to make
1097
   indentation changes (try to avoid this), separate them strictly from real
1098
   changes.
1099

    
1100
   NOTE: If you had to put if()@{ .. @} over a large (> 5 lines) chunk of code,
1101
   then either do NOT change the indentation of the inner part within (don't 
1102
   move it to the right)! or do so in a seperate commit
1103
@item
1104
   Always fill out the commit log message. Describe in a few lines what you
1105
   changed and why. You can refer to mailing list postings if you fix a
1106
   particular bug. Comments such as "fixed!" or "Changed it." are unacceptable.
1107
@item
1108
   If you apply a patch by someone else, include the name and email address in
1109
   the CVS log message. Since the ffmpeg-cvslog mailing list is publicly
1110
   archived you should add some spam protection to the email address. Send an
1111
   answer to ffmpeg-dev (or wherever you got the patch from) saying that
1112
   you applied the patch.
1113
@item
1114
   Do NOT commit to code actively maintained by others without permission. Send
1115
   a patch to ffmpeg-dev instead.
1116
@item
1117
    Subscribe to the ffmpeg-cvslog mailing list. The diffs of all CVS commits
1118
    are sent there and reviewed by all the other developers. Bugs and possible
1119
    improvements or general questions regarding commits are discussed there. We
1120
    expect you to react if problems with your code are uncovered.
1121
@item
1122
    Update the documentation if you change behavior or add features. If you are
1123
    unsure how best to do this, send a patch to ffmpeg-dev, the documentation
1124
    maintainer(s) will review and commit your stuff.
1125
@item
1126
    Revert a commit ONLY in case of a big blunder like committing something not
1127
    intended to be committed or committing a wrong file, the wrong version of a
1128
    patch, cvs policy violation or broken code and you are going to recommit the
1129
    right thing immediately.
1130

    
1131
    Never revert changes made a long time ago or buggy code. Fix it in the
1132
    normal way instead.
1133
@item
1134
    Never write to not allocated memory, never write over the end of arrays, 
1135
    always check values read from some untrusted source before using them as index
1136
    into an array or otherwise risky things.
1137
@end enumerate
1138

    
1139
We think our rules are not too hard. If you have comments, contact us.
1140

    
1141
Note, these rules are mostly borrowed from the MPlayer project.
1142

    
1143
@subsection Renaming/moving files or content of files
1144
  You CANNOT do that. Post a request for such a change to the mailinglist
1145
  Do NOT remove & readd a file - it will kill the changelog!!!!
1146

    
1147
@section Submitting patches
1148

    
1149
First, (@pxref{Coding Rules}) above if you didn't yet.
1150

    
1151
When you submit your patch, try to send a unified diff (diff '-up'
1152
option). I cannot read other diffs :-)
1153

    
1154
Run the regression tests before submitting a patch so that you can
1155
verify that there are no big problems.
1156

    
1157
Patches should be posted as base64 encoded attachments (or any other
1158
encoding which ensures that the patch wont be trashed during 
1159
transmission) to the ffmpeg-devel mailinglist, see 
1160
@url{http://lists.sourceforge.net/lists/listinfo/ffmpeg-devel}
1161

    
1162
It also helps quite a bit if you tell us what the patch does (for example
1163
'replaces lrint by lrintf') , and why (for example '*bsd isnt c99 compliant
1164
and has no lrint()')
1165

    
1166
We reply to all patches submitted and either apply or reject with some
1167
explanation why, but sometimes we are quite busy so it can take a week or 2
1168

    
1169
@section Regression tests
1170

    
1171
Before submitting a patch (or committing with CVS), you should at least
1172
test that you did not break anything.
1173

    
1174
The regression test build a synthetic video stream and a synthetic
1175
audio stream. Then these are encoded then decoded with all codecs or
1176
formats. The CRC (or MD5) of each generated file is recorded in a
1177
result file. Then a 'diff' is launched with the reference results and
1178
the result file.
1179

    
1180
The regression test then goes on to test the ffserver code with a 
1181
limited set of streams. It is important that this step runs correctly
1182
as well.
1183

    
1184
Run 'make test' to test all the codecs and formats.
1185

    
1186
Run 'make fulltest' to test all the codecs, formats and ffserver.
1187

    
1188
[Of course, some patches may change the regression tests results. In
1189
this case, the regression tests reference results shall be modified
1190
accordingly].
1191

    
1192
@bye