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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" or "dvd"). 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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@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
587
@item For streaming at very low bit rate application, use a low frame rate
588 e99c4e10 Fabrice Bellard
and a small gop size. This is especially true for real video where
589
the Linux player does not seem to be very fast, so it can miss
590
frames. An example is:
591 9181577c Fabrice Bellard
592
@example
593 e99c4e10 Fabrice Bellard
ffmpeg -g 3 -r 3 -t 10 -b 50 -s qcif -f rv10 /tmp/b.rm
594 9181577c Fabrice Bellard
@end example
595
596
@item  The parameter 'q' which is displayed while encoding is the current
597 e99c4e10 Fabrice Bellard
quantizer. The value of 1 indicates that a very good quality could
598
be achieved. The value of 31 indicates the worst quality. If q=31
599
too often, it means that the encoder cannot compress enough to meet
600
your bit rate. You must either increase the bit rate, decrease the
601
frame rate or decrease the frame size.
602 9181577c Fabrice Bellard
603
@item If your computer is not fast enough, you can speed up the
604 e99c4e10 Fabrice Bellard
compression at the expense of the compression ratio. You can use
605
'-me zero' to speed up motion estimation, and '-intra' to disable
606
completely motion estimation (you have only I frames, which means it
607
is about as good as JPEG compression).
608 9181577c Fabrice Bellard
609
@item To have very low bitrates in audio, reduce the sampling frequency
610 e99c4e10 Fabrice Bellard
(down to 22050 kHz for mpeg audio, 22050 or 11025 for ac3).
611 9181577c Fabrice Bellard
612
@item To have a constant quality (but a variable bitrate), use the option
613 e99c4e10 Fabrice Bellard
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
614
quality).
615 9181577c Fabrice Bellard
616
@item When converting video files, you can use the '-sameq' option which
617 e99c4e10 Fabrice Bellard
uses in the encoder the same quality factor than in the decoder. It
618
allows to be almost lossless in encoding.
619 9181577c Fabrice Bellard
620
@end itemize
621
622
@chapter Supported File Formats and Codecs
623
624
You can use the @code{-formats} option to have an exhaustive list.
625
626
@section File Formats
627
628 6bf40f39 Philip Gladstone
FFmpeg supports the following file formats through the @code{libavformat}
629 0699d2fe Fabrice Bellard
library:
630 9181577c Fabrice Bellard
631
@multitable @columnfractions .4 .1 .1
632
@item Supported File Format @tab Encoding @tab Decoding @tab Comments
633
@item MPEG audio @tab X @tab X
634
@item MPEG1 systems @tab X  @tab  X 
635
@tab muxed audio and video
636
@item MPEG2 PS @tab X  @tab  X 
637
@tab also known as @code{VOB} file
638
@item MPEG2 TS @tab    @tab  X 
639
@tab also known as DVB Transport Stream
640
@item ASF@tab X @tab X 
641
@item AVI@tab X @tab X 
642
@item WAV@tab X @tab X 
643
@item Macromedia Flash@tab X @tab X
644
@tab Only embedded audio is decoded
645 2eb5d024 Fabrice Bellard
@item FLV              @tab  X @tab X
646
@tab Macromedia Flash video files
647 9181577c Fabrice Bellard
@item Real Audio and Video @tab X @tab X 
648
@item Raw AC3 @tab X  @tab  X 
649
@item Raw MJPEG @tab X  @tab  X 
650
@item Raw MPEG video @tab X  @tab  X 
651
@item Raw PCM8/16 bits, mulaw/Alaw@tab X  @tab  X 
652 42cad81a Mike Melanson
@item Raw CRI ADX audio @tab X  @tab  X 
653 9181577c Fabrice Bellard
@item SUN AU format @tab X  @tab  X 
654 7fe4c823 Alex Beregszaszi
@item NUT @tab X @tab X @tab NUT Open Container Format
655 8a5483e7 Mike Melanson
@item Quicktime        @tab X @tab  X 
656
@item MPEG4            @tab X @tab  X 
657 9181577c Fabrice Bellard
@tab MPEG4 is a variant of Quicktime
658 0699d2fe Fabrice Bellard
@item Raw MPEG4 video  @tab  X @tab  X 
659 4fa1c4fa Roman Shaposhnik
@item DV               @tab  X @tab  X
660 701b603d Mike Melanson
@item 4xm              @tab    @tab X
661
@tab 4X Technologies format, used in some games
662 4d3b1f8d Mike Melanson
@item Playstation STR  @tab    @tab X
663
@item Id RoQ           @tab    @tab X
664
@tab used in Quake III, Jedi Knight 2, other computer games
665
@item Interplay MVE    @tab    @tab X
666
@tab format used in various Interplay computer games
667 b17e9c99 Mike Melanson
@item WC3 Movie        @tab    @tab X
668
@tab multimedia format used in Origin's Wing Commander III computer game
669 2fdf638b Mike Melanson
@item Sega FILM/CPK    @tab    @tab X
670
@tab used in many Sega Saturn console games
671
@item Westwood Studios VQA/AUD  @tab    @tab X
672
@tab Multimedia formats used in Westwood Studios games
673 4120a53a Mike Melanson
@item Id Cinematic (.cin) @tab    @tab X
674
@tab Used in Quake II
675 42cad81a Mike Melanson
@item FLIC format      @tab    @tab X
676
@tab .fli/.flc files
677 da00f30e Mike Melanson
@item Sierra VMD       @tab    @tab X
678
@tab used in Sierra CD-ROM games
679 38088adf Mike Melanson
@item Matroska         @tab    @tab X
680 9181577c Fabrice Bellard
@end multitable
681
682
@code{X} means that the encoding (resp. decoding) is supported.
683
684 0699d2fe Fabrice Bellard
@section Image Formats
685
686
FFmpeg can read and write images for each frame of a video sequence. The
687
following image formats are supported:
688
689
@multitable @columnfractions .4 .1 .1
690
@item Supported Image Format @tab Encoding @tab Decoding @tab Comments
691
@item PGM, PPM     @tab X @tab X 
692 2eb5d024 Fabrice Bellard
@item PAM          @tab X @tab X @tab PAM is a PNM extension with alpha support
693
@item PGMYUV       @tab X @tab X @tab PGM with U and V components in YUV 4:2:0
694 0699d2fe Fabrice Bellard
@item JPEG         @tab X @tab X @tab Progressive JPEG is not supported
695
@item .Y.U.V       @tab X @tab X @tab One raw file per component
696 2eb5d024 Fabrice Bellard
@item Animated GIF @tab X @tab X @tab Only uncompressed GIFs are generated
697
@item PNG          @tab X @tab X @tab 2 bit and 4 bit/pixel not supported yet
698 6a91ec51 Mike Melanson
@item SGI          @tab X @tab X @tab SGI RGB image format
699 0699d2fe Fabrice Bellard
@end multitable
700
701
@code{X} means that the encoding (resp. decoding) is supported.
702
703 9181577c Fabrice Bellard
@section Video Codecs
704
705
@multitable @columnfractions .4 .1 .1 .7
706
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
707 4745b5bf Fabrice Bellard
@item MPEG1 video            @tab  X  @tab  X
708 50f52fcd Fabrice Bellard
@item MPEG2 video            @tab  X  @tab  X 
709 9181577c Fabrice Bellard
@item MPEG4                  @tab  X  @tab  X @tab Also known as DIVX4/5
710
@item MSMPEG4 V1             @tab  X  @tab  X
711
@item MSMPEG4 V2             @tab  X  @tab  X
712
@item MSMPEG4 V3             @tab  X  @tab  X @tab Also known as DIVX3
713
@item WMV7                   @tab  X  @tab  X
714 701b603d Mike Melanson
@item WMV8                   @tab  X  @tab  X @tab Not completely working
715 9181577c Fabrice Bellard
@item H263(+)                @tab  X  @tab  X @tab Also known as Real Video 1.0
716
@item MJPEG                  @tab  X  @tab  X 
717 d6896c49 Alex Beregszaszi
@item Lossless MJPEG         @tab  X  @tab  X
718
@item Apple MJPEG-B          @tab     @tab  X
719
@item Sunplus MJPEG          @tab     @tab  X @tab fourcc: SP5X
720 4fa1c4fa Roman Shaposhnik
@item DV                     @tab  X  @tab  X 
721 4745b5bf Fabrice Bellard
@item Huff YUV               @tab  X  @tab  X
722 d6896c49 Alex Beregszaszi
@item FFmpeg Video 1         @tab  X  @tab  X @tab Lossless codec (fourcc: FFV1)
723 701b603d Mike Melanson
@item Asus v1                @tab  X  @tab  X @tab fourcc: ASV1
724 4d3b1f8d Mike Melanson
@item Asus v2                @tab  X  @tab  X @tab fourcc: ASV2
725 701b603d Mike Melanson
@item Creative YUV           @tab     @tab  X @tab fourcc: CYUV
726
@item H.264                  @tab     @tab  X
727 d2bfadc0 Mike Melanson
@item Sorenson Video 1       @tab  X  @tab  X @tab fourcc: SVQ1
728 701b603d Mike Melanson
@item Sorenson Video 3       @tab     @tab  X @tab fourcc: SVQ3
729
@item On2 VP3                @tab     @tab  X @tab still experimental
730 d6896c49 Alex Beregszaszi
@item Theora                 @tab     @tab  X @tab still experimental
731 701b603d Mike Melanson
@item Intel Indeo 3          @tab     @tab  X @tab only works on i386 right now
732 2eb5d024 Fabrice Bellard
@item FLV                    @tab  X  @tab  X @tab Flash H263 variant
733 4d3b1f8d Mike Melanson
@item ATI VCR1               @tab     @tab  X @tab fourcc: VCR1
734 7fe4c823 Alex Beregszaszi
@item ATI VCR2               @tab     @tab  X @tab fourcc: VCR2
735 4d3b1f8d Mike Melanson
@item Cirrus Logic AccuPak   @tab     @tab  X @tab fourcc: CLJR
736
@item 4X Video               @tab     @tab  X @tab used in certain computer games
737
@item Sony Playstation MDEC  @tab     @tab  X 
738
@item Id RoQ                 @tab     @tab  X @tab used in Quake III, Jedi Knight 2, other computer games
739 b17e9c99 Mike Melanson
@item Xan/WC3                @tab     @tab  X @tab used in Wing Commander III .MVE files
740 186447f8 Mike Melanson
@item Interplay Video        @tab     @tab  X @tab used in Interplay .MVE files
741 070ed1bc Mike Melanson
@item Apple Animation        @tab     @tab  X @tab fourcc: 'rle '
742 42cad81a Mike Melanson
@item Apple Graphics         @tab     @tab  X @tab fourcc: 'smc '
743 2fdf638b Mike Melanson
@item Apple Video            @tab     @tab  X @tab fourcc: rpza
744
@item Cinepak                @tab     @tab  X
745
@item Microsoft RLE          @tab     @tab  X
746
@item Microsoft Video-1      @tab     @tab  X
747 4120a53a Mike Melanson
@item Westwood VQA           @tab     @tab  X
748
@item Id Cinematic Video     @tab     @tab  X @tab used in Quake II
749 1dc1ed99 Roberto Togni
@item Planar RGB             @tab     @tab  X @tab fourcc: 8BPS
750 42cad81a Mike Melanson
@item FLIC video             @tab     @tab  X
751 9a4117d5 Mike Melanson
@item Duck TrueMotion v1     @tab     @tab  X @tab fourcc: DUCK
752 da00f30e Mike Melanson
@item VMD Video              @tab     @tab  X @tab used in Sierra VMD files
753 a273bbfb Roberto Togni
@item MSZH                   @tab     @tab  X @tab Part of LCL
754
@item ZLIB                   @tab  X  @tab  X @tab Part of LCL, encoder experimental
755 9181577c Fabrice Bellard
@end multitable
756
757
@code{X} means that the encoding (resp. decoding) is supported.
758
759 60837265 Fabrice Bellard
Check at @url{http://www.mplayerhq.hu/~michael/codec-features.html} to
760
get a precise comparison of FFmpeg MPEG4 codec compared to the other
761
solutions.
762
763 9181577c Fabrice Bellard
@section Audio Codecs
764
765
@multitable @columnfractions .4 .1 .1 .1 .7
766
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
767
@item MPEG audio layer 2     @tab  IX  @tab  IX 
768
@item MPEG audio layer 1/3   @tab IX   @tab  IX
769 6bf40f39 Philip Gladstone
@tab MP3 encoding is supported through the external library LAME
770 37776c3b Benjamin Larsson
@item AC3                    @tab  IX  @tab  IX
771 2eb5d024 Fabrice Bellard
@tab liba52 is used internally for decoding
772 34d7008d Philip Gladstone
@item Vorbis                 @tab  X   @tab  X
773 2eb5d024 Fabrice Bellard
@tab supported through the external library libvorbis
774 4745b5bf Fabrice Bellard
@item WMA V1/V2              @tab      @tab X
775 f6fa7a6c Benjamin Larsson
@item AAC                    @tab X    @tab X
776
@tab supported through the external library libfaac/libfaad
777 d4c3c5a6 Michael Niedermayer
@item Microsoft ADPCM        @tab X    @tab X
778 4d3b1f8d Mike Melanson
@item MS IMA ADPCM           @tab X    @tab X
779
@item QT IMA ADPCM           @tab      @tab X
780
@item 4X IMA ADPCM           @tab      @tab X
781 d4e437df Roman Shaposhnik
@item G.726  ADPCM           @tab X    @tab X
782 b17e9c99 Mike Melanson
@item Duck DK3 IMA ADPCM     @tab      @tab X
783
@tab used in some Sega Saturn console games
784
@item Duck DK4 IMA ADPCM     @tab      @tab X
785
@tab used in some Sega Saturn console games
786 2fdf638b Mike Melanson
@item Westwood Studios IMA ADPCM @tab      @tab X
787 42cad81a Mike Melanson
@tab used in Westwood Studios games like Command and Conquer
788 7d8379f2 Mike Melanson
@item SMJPEG IMA ADPCM       @tab      @tab X
789
@tab used in certain Loki game ports
790 42cad81a Mike Melanson
@item CD-ROM XA ADPCM        @tab      @tab X
791
@item CRI ADX ADPCM          @tab X    @tab X
792
@tab used in Sega Dreamcast games
793 7d8379f2 Mike Melanson
@item Electronic Arts ADPCM  @tab      @tab X
794
@tab used in various EA titles
795 2eb5d024 Fabrice Bellard
@item RA144                  @tab      @tab X
796
@tab Real 14400 bit/s codec
797
@item RA288                  @tab      @tab X
798
@tab Real 28800 bit/s codec
799 37776c3b Benjamin Larsson
@item RADnet                 @tab X    @tab IX
800
@tab Real lowbitrate AC3 codec, liba52 is used for decoding
801 2eb5d024 Fabrice Bellard
@item AMR-NB                 @tab X    @tab X
802
@tab supported through an external library
803 d663a1fd Michael Niedermayer
@item AMR-WB                 @tab X    @tab X
804
@tab supported through an external library
805 2eb5d024 Fabrice Bellard
@item DV audio               @tab      @tab X
806 4d3b1f8d Mike Melanson
@item Id RoQ DPCM            @tab      @tab X
807
@tab used in Quake III, Jedi Knight 2, other computer games
808
@item Interplay MVE DPCM     @tab      @tab X
809
@tab used in various Interplay computer games
810 b17e9c99 Mike Melanson
@item Xan DPCM               @tab      @tab X
811
@tab used in Origin's Wing Commander IV AVI files
812 d6896c49 Alex Beregszaszi
@item Apple MACE 3           @tab      @tab X
813
@item Apple MACE 6           @tab      @tab X
814 f8d58f4d Alex Beregszaszi
@item FLAC                   @tab      @tab X
815 9181577c Fabrice Bellard
@end multitable
816
817
@code{X} means that the encoding (resp. decoding) is supported.
818
819
@code{I} means that an integer only version is available too (ensures highest
820
performances on systems without hardware floating point support).
821
822 47d944d2 Fabrice Bellard
@chapter Platform Specific information
823
824
@section Linux
825
826
ffmpeg should be compiled with at least GCC 2.95.3. GCC 3.2 is the
827 6bf40f39 Philip Gladstone
preferred compiler now for ffmpeg. All future optimizations will depend on
828 47d944d2 Fabrice Bellard
features only found in GCC 3.2.
829
830
@section BSD
831
832
@section Windows
833
834 b030b284 Fabrice Bellard
@subsection Native Windows compilation
835
836
@itemize
837
@item Install the current versions of MSYS and MinGW from
838
@url{http://www.mingw.org/}. You can find detailed installation
839
instructions in the download section and the FAQ.
840
841 50f52fcd Fabrice Bellard
@item If you want to test the FFmpeg Simple Media Player, also download 
842
the MinGW development library of SDL 1.2.x
843
(@file{SDL-devel-1.2.x-mingw32.tar.gz}) from
844
@url{http://www.libsdl.org}. Unpack it in a temporary place, and
845
unpack the archive @file{i386-mingw32msvc.tar.gz} in the MinGW tool
846 988a9f9e Fabrice Bellard
directory. Edit the @file{sdl-config} script so that it gives the
847
correct SDL directory when invoked.
848 50f52fcd Fabrice Bellard
849
@item Extract the current version of FFmpeg (the latest release version or the current CVS snapshot whichever is recommended).
850 b030b284 Fabrice Bellard
 
851
@item Start the MSYS shell (file @file{msys.bat}).
852
853 50f52fcd Fabrice Bellard
@item Change to the FFMPEG directory and follow
854
 the instructions of how to compile ffmpeg (file
855
@file{INSTALL}). Usually, launching @file{./configure} and @file{make}
856
suffices. If you have problems using SDL, verify that
857
@file{sdl-config} can be launched from the MSYS command line.
858
859 988a9f9e Fabrice Bellard
@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 
860
@file{ffplay}.
861 50f52fcd Fabrice Bellard
862 b030b284 Fabrice Bellard
@end itemize
863
864 988a9f9e Fabrice Bellard
Notes: 
865
@itemize
866 50f52fcd Fabrice Bellard
867 988a9f9e Fabrice Bellard
@item The target @file{make wininstaller} can be used to create a
868
Nullsoft based Windows installer for FFmpeg and FFplay. @file{SDL.dll}
869
must be copied in the ffmpeg directory in order to build the
870
installer.
871
872
@item By using @code{./configure --enable-shared} when configuring ffmpeg, 
873
you can build @file{avcodec.dll} and @file{avformat.dll}. With
874
@code{make install} you install the FFmpeg DLLs and the associated
875
headers in @file{Program Files/FFmpeg}. 
876
877
@item Visual C++ compatibility: if you used @code{./configure --enable-shared} 
878
when configuring FFmpeg, then FFmpeg tries to use the Microsoft Visual
879
C++ @code{lib} tool to build @code{avcodec.lib} and
880
@code{avformat.lib}. With these libraries, you can link your Visual C++
881
code directly with the FFmpeg DLLs.
882
883
@end itemize
884 b030b284 Fabrice Bellard
885
@subsection Cross compilation for Windows with Linux
886
887
You must use the MinGW cross compilation tools available at
888
@url{http://www.mingw.org/}.
889
890
Then configure ffmpeg with the following options:
891
@example
892
./configure --enable-mingw32 --cross-prefix=i386-mingw32msvc-
893
@end example
894
(you can change the cross-prefix according to the prefix choosen for the
895
MinGW tools).
896
897
Then you can easily test ffmpeg with wine
898
(@url{http://www.winehq.com/}).
899
900 47d944d2 Fabrice Bellard
@section MacOS X
901
902
@section BeOS
903
904
The configure script should guess the configuration itself.
905
Networking support is currently not finished.
906
errno issues fixed by Andrew Bachmann.
907
908
Old stuff:
909
910
Fran?ois Revol - revol at free dot fr - April 2002
911
912
The configure script should guess the configuration itself, 
913
however I still didn't tested building on net_server version of BeOS.
914
915
ffserver is broken (needs poll() implementation).
916
917
There is still issues with errno codes, which are negative in BeOs, and
918
that ffmpeg negates when returning. This ends up turning errors into 
919
valid results, then crashes.
920
(To be fixed)
921
922 34d7008d Philip Gladstone
@chapter Developers Guide
923 9181577c Fabrice Bellard
924
@section API
925
@itemize
926
@item libavcodec is the library containing the codecs (both encoding and
927
  decoding). See @file{libavcodec/apiexample.c} to see how to use it.
928
929
@item libavformat is the library containing the file formats handling (mux and
930 a93b9dba Fabrice Bellard
  demux code for several formats). See @file{ffplay.c} to use it in a
931
player. See @file{output_example.c} to use it to generate audio or video
932
streams.
933
934 9181577c Fabrice Bellard
@end itemize
935
936
@section Integrating libavcodec or libavformat in your program
937
938
You can integrate all the source code of the libraries to link them
939
statically to avoid any version problem. All you need is to provide a
940
'config.mak' and a 'config.h' in the parent directory. See the defines
941
generated by ./configure to understand what is needed.
942
943
You can use libavcodec or libavformat in your commercial program, but
944
@emph{any patch you make must be published}. The best way to proceed is
945
to send your patches to the ffmpeg mailing list.
946
947 80d1c272 Michael Niedermayer
@node Coding Rules
948 9181577c Fabrice Bellard
@section Coding Rules
949
950 cb6e87c1 Falk Hüffner
ffmpeg is programmed in the ISO C90 language with a few additional
951
features from ISO C99, namely:
952
@itemize @bullet
953
@item
954
the @samp{inline} keyword;
955
@item
956
@samp{//} comments;
957
@item
958
designated struct initializers (@samp{struct s x = @{ .i = 17 @};})
959
@item
960
compound literals (@samp{x = (struct s) { 17, 23 @};})
961
@end itemize
962
963
These features are supported by all compilers we care about, so we won't
964
accept patches to remove their use unless they absolutely don't impair
965
clarity and performance.
966
967
All code must compile with gcc 2.95 and gcc 3.3. Currently, ffmpeg also
968
compiles with several other compilers, such as the Compaq ccc compiler
969
or Sun Studio 9, and we would like to keep it that way unless it would
970
be exceedingly involved. To ensure compatibility, please don't use any
971
additional C99 features or gcc extensions. Watch out especially for:
972
@itemize @bullet
973
@item
974
mixing statements and declarations;
975
@item
976
@samp{long long} (use @samp{int64_t} instead);
977
@item
978
@samp{__attribute__} not protected by @samp{#ifdef __GNUC__} or similar;
979
@item
980
gcc statement expressions (@samp{(x = (@{ int y = 4; y; @})}).
981
@end itemize
982 9181577c Fabrice Bellard
983 cb6e87c1 Falk Hüffner
Indent size is 4. The TAB character should not be used.
984 9181577c Fabrice Bellard
The presentation is the one specified by 'indent -i4 -kr'.
985
986
Main priority in ffmpeg is simplicity and small code size (=less
987
bugs).
988
989 80d1c272 Michael Niedermayer
Comments: use the JavaDoc/Doxygen 
990 f4888b83 Michael Niedermayer
format (see examples below) so that a documentation
991 80d1c272 Michael Niedermayer
can be generated automatically. All non trivial functions should have a comment
992
above it explaining what the function does, even if its just one sentance.
993
All Structures and their member variables should be documented too.
994 f4888b83 Michael Niedermayer
@example
995
/**
996
?* @file mpeg.c
997
?* mpeg codec.
998
?* @author ...
999
?*/
1000
1001
/**
1002
?* Summary sentance.
1003
?* more text ...
1004
?* ...
1005
?*/
1006
typedef struct Foobar{
1007
? ? int var1; /**< var1 description */
1008
? ? int var2; ///< var2 description
1009
? ? /** var3 description */
1010
? ? int var3;
1011
} Foobar;
1012
1013
/**
1014
?* Summary sentance.
1015
?* more text ...
1016
?* ...
1017
?* @param my_parameter description of my_parameter
1018
?* @return return value description
1019
?*/
1020
int myfunc(int my_parameter)
1021
...
1022
@end example
1023 9181577c Fabrice Bellard
1024 36d9b4e8 Michael Niedermayer
fprintf and printf are forbidden in libavformat and libavcodec, 
1025
please use av_log() instead.
1026
1027 9181577c Fabrice Bellard
@section Submitting patches
1028
1029 80d1c272 Michael Niedermayer
First, (@pxref{Coding Rules}) above if you didn't yet.
1030
1031 6a6810b1 Michael Niedermayer
When you submit your patch, try to send a unified diff (diff '-up'
1032 9181577c Fabrice Bellard
option). I cannot read other diffs :-)
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Run the regression tests before submitting a patch so that you can
1035 6bf40f39 Philip Gladstone
verify that there are no big problems.
1036 9181577c Fabrice Bellard
1037
Patches should be posted as base64 encoded attachments (or any other
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encoding which ensures that the patch wont be trashed during 
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transmission) to the ffmpeg-devel mailinglist, see 
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@url{http://lists.sourceforge.net/lists/listinfo/ffmpeg-devel}
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1042 54fcf429 Michael Niedermayer
It also helps quite a bit if you tell us what the patch does (for example
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'replaces lrint by lrintf') , and why (for example '*bsd isnt c99 compliant
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and has no lrint()')
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1046 9181577c Fabrice Bellard
@section Regression tests
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1048 6bf40f39 Philip Gladstone
Before submitting a patch (or committing with CVS), you should at least
1049 9181577c Fabrice Bellard
test that you did not break anything.
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The regression test build a synthetic video stream and a synthetic
1052 6bf40f39 Philip Gladstone
audio stream. Then these are encoded then decoded with all codecs or
1053 9181577c Fabrice Bellard
formats. The CRC (or MD5) of each generated file is recorded in a
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result file. Then a 'diff' is launched with the reference results and
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the result file.
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1057 6bf40f39 Philip Gladstone
The regression test then goes on to test the ffserver code with a 
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limited set of streams. It is important that this step runs correctly
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as well.
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1061 36d9b4e8 Michael Niedermayer
Run 'make test' to test all the codecs and formats.
1062 9181577c Fabrice Bellard
1063 5ee03c86 Fabrice Bellard
Run 'make fulltest' to test all the codecs, formats and ffserver.
1064 9181577c Fabrice Bellard
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[Of course, some patches may change the regression tests results. In
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this case, the regression tests reference results shall be modified
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accordingly].
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@bye