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1770 lines
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1770 lines
60 KiB
\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 parameters that can possibly be |
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derived automatically. You usually only have to specify the target |
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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 grab video and audio from devices given that you specify the input |
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format and device. |
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@example |
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ffmpeg -f audio_device -i /dev/dsp -f video4linux2 -i /dev/video0 /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 with any TV viewer such as xawtv |
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(@url{http://bytesex.org/xawtv/}) by Gerd Knorr. You also |
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have to set the audio recording levels correctly with a |
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standard mixer. |
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@section X11 grabbing |
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FFmpeg can grab the X11 display. |
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@example |
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ffmpeg -f x11grab -s cif -i :0.0 /tmp/out.mpg |
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@end example |
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0.0 is display.screen number of your X11 server, same as |
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the DISPLAY environment variable. |
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@example |
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ffmpeg -f x11grab -s cif -i :0.0+10,20 /tmp/out.mpg |
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@end example |
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0.0 is display.screen number of your X11 server, same as the DISPLAY environment |
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variable. 10 is the x-offset and 20 the y-offset for the grabbing. |
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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 use YUV files as input: |
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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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test.yuv is a file containing raw YUV planar data. Each frame is composed |
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of the Y plane followed by the U and V planes at 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 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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Converts 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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Converts a.wav to MPEG audio at 22050Hz sample rate. |
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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 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0 |
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@end example |
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Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map |
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file:index' specifies 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 800k -g 300 -bf 2 -acodec mp3 -ab 128k snatch.avi |
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@end example |
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This is a typical DVD ripping example; the input is a VOB file, the |
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output 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, and |
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GOP size is 300 which means one intra frame every 10 seconds for 29.97fps |
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input video. Furthermore, the audio stream is MP3-encoded so you need |
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to enable LAME support by passing @code{--enable-mp3lame} to configure. |
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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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As a general rule, options are applied to the next specified |
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file. Therefore, order is important, and you can have the same |
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option on the command line multiple times. Each occurrence is |
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then applied to the next input or output file. |
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* To set the video bitrate of the output file to 64kbit/s: |
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@example |
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ffmpeg -i input.avi -b 64k output.avi |
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@end example |
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* To force the frame rate of the input and output file to 24 fps: |
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@example |
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ffmpeg -r 24 -i input.avi output.avi |
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@end example |
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* To force the frame rate of the output file to 24 fps: |
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@example |
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ffmpeg -i input.avi -r 24 output.avi |
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@end example |
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* To force the frame rate of input file to 1 fps and the output file to 24 fps: |
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@example |
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ffmpeg -r 1 -i input.avi -r 24 output.avi |
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@end example |
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The format option may be needed for raw input 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 parameters 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 -version |
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Show version. |
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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 filename |
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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. |
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@code{hh:mm:ss[.xxx]} syntax is also supported. |
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@item -fs limit_size |
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Set the file size limit. |
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@item -ss position |
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Seek to given time position in seconds. |
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@code{hh:mm:ss[.xxx]} syntax is also supported. |
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@item -itsoffset offset |
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Set the input time offset in seconds. |
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@code{[-]hh:mm:ss[.xxx]} syntax is also supported. |
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This option affects all the input files that follow it. |
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The offset is added to the timestamps of the input files. |
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Specifying a positive offset means that the corresponding |
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streams are delayed by 'offset' seconds. |
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@item -title string |
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Set the title. |
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@item -timestamp time |
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Set the timestamp. |
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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 -album string |
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Set the album. |
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@item -track number |
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Set the track. |
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@item -year number |
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Set the year. |
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@item -v verbose |
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Control amount of logging. |
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@item -target type |
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Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd", |
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"ntsc-svcd", ... ). All the format options (bitrate, codecs, |
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buffer sizes) are then set automatically. 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 |
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they do not conflict with the 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 -dframes number |
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Set the number of data frames to record. |
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@item -scodec codec |
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Force subtitle codec ('copy' to copy stream). |
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@item -newsubtitle |
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Add a new subtitle stream to the current output stream. |
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@item -slang code |
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Set the ISO 639 language code (3 letters) of the current subtitle stream. |
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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 bit/s (default = 200 kb/s). |
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@item -vframes number |
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Set the number of video frames to record. |
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@item -r fps |
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Set frame rate (Hz value, fraction or abbreviation), (default = 25). |
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@item -s size |
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Set frame size. The format is @samp{wxh} (ffserver default = 160x128, ffmpeg default = same as source). |
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The 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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@item qqvga |
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160x120 |
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@item qvga |
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320x240 |
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@item vga |
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640x480 |
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@item svga |
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800x600 |
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@item xga |
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1024x768 |
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@item uxga |
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1600x1200 |
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@item qxga |
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2048x1536 |
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@item sxga |
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1280x1024 |
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@item qsxga |
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2560x2048 |
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@item hsxga |
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5120x4096 |
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@item wvga |
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852x480 |
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@item wxga |
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1366x768 |
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@item wsxga |
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1600x1024 |
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@item wuxga |
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1920x1200 |
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@item woxga |
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2560x1600 |
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@item wqsxga |
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3200x2048 |
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@item wquxga |
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3840x2400 |
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@item whsxga |
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6400x4096 |
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@item whuxga |
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7680x4800 |
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@item cga |
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320x200 |
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@item ega |
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640x350 |
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@item hd480 |
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852x480 |
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@item hd720 |
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1280x720 |
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@item hd1080 |
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1920x1080 |
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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 padcolor is expressed |
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as a six digit hexadecimal number where the first two digits |
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represent red, the middle two digits green and last two digits |
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blue (default = 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 bit/s). |
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@item -maxrate bitrate |
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Set max video bitrate tolerance (in bit/s). |
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@item -minrate bitrate |
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Set min video bitrate tolerance (in bit/s). |
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@item -bufsize size |
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Set rate control buffer size (in bits). |
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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 |
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pass and the video is generated at the exact requested bitrate |
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in the second pass. |
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@item -passlogfile file |
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Set two pass logfile name to @var{file}. |
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@item -newvideo |
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Add a new video stream to the current output stream. |
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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 -pix_fmt format |
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Set pixel format. |
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@item -g gop_size |
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Set the group of pictures size. |
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@item -intra |
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Use only intra frames. |
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@item -vdt n |
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Discard threshold. |
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@item -qscale q |
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Use fixed video quantizer scale (VBR). |
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@item -qmin q |
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minimum video quantizer scale (VBR) |
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@item -qmax q |
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maximum video quantizer scale (VBR) |
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@item -qdiff q |
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maximum difference between the quantizer scales (VBR) |
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@item -qblur blur |
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video quantizer scale blur (VBR) |
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@item -qcomp compression |
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video quantizer scale compression (VBR) |
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@item -lmin lambda |
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minimum video lagrange factor (VBR) |
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@item -lmax lambda |
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max video lagrange factor (VBR) |
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@item -mblmin lambda |
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minimum macroblock quantizer scale (VBR) |
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@item -mblmax lambda |
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maximum macroblock quantizer scale (VBR) |
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These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units, |
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but you may use the QP2LAMBDA constant to easily convert from 'q' units: |
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@example |
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ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext |
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@end example |
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@item -rc_init_cplx complexity |
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initial complexity for single 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 = @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}. |
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Available methods are (from lowest 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_CAREFUL (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: Choose the one which needs the fewest bits. |
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@item 2 |
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FF_MB_DECISION_RD: rate distortion |
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@end table |
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@item -4mv |
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Use four motion vector by macroblock (MPEG-4 only). |
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@item -part |
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Use data partitioning (MPEG-4 only). |
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@item -bug param |
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Work around encoder bugs that are not auto-detected. |
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@item -strict strictness |
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How strictly to follow the standards. |
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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 -ilme |
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Force interlacing support in encoder (MPEG-2 and MPEG-4 only). |
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Use this option if your input file is interlaced and you want |
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to keep the interlaced format for minimum losses. |
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The alternative is to deinterlace the input stream with |
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@option{-deinterlace}, but deinterlacing introduces 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 -vstats_file file |
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Dump video coding statistics to @var{file}. |
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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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@item -top n |
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top=1/bottom=0/auto=-1 field first |
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@item -dc precision |
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Intra_dc_precision. |
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@item -vtag fourcc/tag |
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Force video tag/fourcc. |
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@item -qphist |
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Show QP histogram. |
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@item -vbsf bitstream filter |
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Bitstream filters available are "dump_extra", "remove_extra", "noise". |
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@end table |
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@section Audio Options |
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@table @option |
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@item -aframes number |
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Set the number of audio frames to record. |
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@item -ar freq |
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Set the audio sampling frequency (default = 44100 Hz). |
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@item -ab bitrate |
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Set the audio bitrate in bit/s (default = 64k). |
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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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specify that the raw codec data must be copied as is. |
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@item -newaudio |
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Add a new audio track to the output file. If you want to specify parameters, |
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do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..). |
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Mapping will be done automatically, if the number of output streams is equal to |
|
the number of input streams, else it will pick the first one that matches. You |
|
can override the mapping using @code{-map} as usual. |
|
|
|
Example: |
|
@example |
|
ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio |
|
@end example |
|
@item -alang code |
|
Set the ISO 639 language code (3 letters) of the current audio stream. |
|
@end table |
|
|
|
@section Advanced Audio options: |
|
|
|
@table @option |
|
@item -atag fourcc/tag |
|
Force audio tag/fourcc. |
|
@item -absf bitstream filter |
|
Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp". |
|
@end table |
|
|
|
@section Subtitle options: |
|
|
|
@table @option |
|
@item -scodec codec |
|
Force subtitle codec ('copy' to copy stream). |
|
@item -newsubtitle |
|
Add a new subtitle stream to the current output stream. |
|
@item -slang code |
|
Set the ISO 639 language code (3 letters) of the current subtitle stream. |
|
@end table |
|
|
|
@section Audio/Video grab options |
|
|
|
@table @option |
|
@item -vc channel |
|
Set video grab channel (DV1394 only). |
|
@item -tvstd standard |
|
Set television standard (NTSC, PAL (SECAM)). |
|
@item -isync |
|
Synchronize read on input. |
|
@end table |
|
|
|
@section Advanced options |
|
|
|
@table @option |
|
@item -map input stream id[:input stream id] |
|
Set stream mapping from input streams to output streams. |
|
Just enumerate the input streams in the order you want them in the output. |
|
[input stream id] sets the (input) stream to sync against. |
|
@item -map_meta_data outfile:infile |
|
Set meta data information of outfile from infile. |
|
@item -debug |
|
Print specific debug info. |
|
@item -benchmark |
|
Add timings for benchmarking. |
|
@item -dump |
|
Dump each input packet. |
|
@item -hex |
|
When dumping packets, also dump the payload. |
|
@item -bitexact |
|
Only use bit exact algorithms (for codec testing). |
|
@item -ps size |
|
Set packet size in bits. |
|
@item -re |
|
Read input at native frame rate. Mainly used to simulate a grab device. |
|
@item -loop_input |
|
Loop over the input stream. Currently it works only for image |
|
streams. This option is used for automatic FFserver testing. |
|
@item -loop_output number_of_times |
|
Repeatedly loop output for formats that support looping such as animated GIF |
|
(0 will loop the output infinitely). |
|
@item -threads count |
|
Thread count. |
|
@item -vsync parameter |
|
Video sync method. Video will be stretched/squeezed to match the timestamps, |
|
it is done by duplicating and dropping frames. With -map you can select from |
|
which stream the timestamps should be taken. You can leave either video or |
|
audio unchanged and sync the remaining stream(s) to the unchanged one. |
|
@item -async samples_per_second |
|
Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps, |
|
the parameter is the maximum samples per second by which the audio is changed. |
|
-async 1 is a special case where only the start of the audio stream is corrected |
|
without any later correction. |
|
@end table |
|
|
|
@node FFmpeg formula evaluator |
|
@section FFmpeg formula evaluator |
|
|
|
When evaluating a rate control string, FFmpeg uses an internal formula |
|
evaluator. |
|
|
|
The following binary operators are available: @code{+}, @code{-}, |
|
@code{*}, @code{/}, @code{^}. |
|
|
|
The following unary operators are available: @code{+}, @code{-}, |
|
@code{(...)}. |
|
|
|
The following functions are available: |
|
@table @var |
|
@item sinh(x) |
|
@item cosh(x) |
|
@item tanh(x) |
|
@item sin(x) |
|
@item cos(x) |
|
@item tan(x) |
|
@item exp(x) |
|
@item log(x) |
|
@item squish(x) |
|
@item gauss(x) |
|
@item abs(x) |
|
@item max(x, y) |
|
@item min(x, y) |
|
@item gt(x, y) |
|
@item lt(x, y) |
|
@item eq(x, y) |
|
@item bits2qp(bits) |
|
@item qp2bits(qp) |
|
@end table |
|
|
|
The following constants are available: |
|
@table @var |
|
@item PI |
|
@item E |
|
@item iTex |
|
@item pTex |
|
@item tex |
|
@item mv |
|
@item fCode |
|
@item iCount |
|
@item mcVar |
|
@item var |
|
@item isI |
|
@item isP |
|
@item isB |
|
@item avgQP |
|
@item qComp |
|
@item avgIITex |
|
@item avgPITex |
|
@item avgPPTex |
|
@item avgBPTex |
|
@item avgTex |
|
@end table |
|
|
|
@c man end |
|
|
|
@ignore |
|
|
|
@setfilename ffmpeg |
|
@settitle FFmpeg video converter |
|
|
|
@c man begin SEEALSO |
|
ffserver(1), ffplay(1) and the HTML documentation of @file{ffmpeg}. |
|
@c man end |
|
|
|
@c man begin AUTHOR |
|
Fabrice Bellard |
|
@c man end |
|
|
|
@end ignore |
|
|
|
@section Protocols |
|
|
|
The filename can be @file{-} to read from standard input or to write |
|
to standard output. |
|
|
|
FFmpeg also handles many protocols specified with an URL syntax. |
|
|
|
Use 'ffmpeg -formats' to see a list of the supported protocols. |
|
|
|
The protocol @code{http:} is currently used only to communicate with |
|
FFserver (see the FFserver documentation). When FFmpeg will be a |
|
video player it will also be used for streaming :-) |
|
|
|
@chapter Tips |
|
|
|
@itemize |
|
@item For streaming at very low bitrate application, use a low frame rate |
|
and a small GOP size. This is especially true for RealVideo where |
|
the Linux player does not seem to be very fast, so it can miss |
|
frames. An example is: |
|
|
|
@example |
|
ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm |
|
@end example |
|
|
|
@item The parameter 'q' which is displayed while encoding is the current |
|
quantizer. The value 1 indicates that a very good quality could |
|
be achieved. The value 31 indicates the worst quality. If q=31 appears |
|
too often, it means that the encoder cannot compress enough to meet |
|
your bitrate. You must either increase the bitrate, decrease the |
|
frame rate or decrease the frame size. |
|
|
|
@item If your computer is not fast enough, you can speed up the |
|
compression at the expense of the compression ratio. You can use |
|
'-me zero' to speed up motion estimation, and '-intra' to disable |
|
motion estimation completely (you have only I-frames, which means it |
|
is about as good as JPEG compression). |
|
|
|
@item To have very low audio bitrates, reduce the sampling frequency |
|
(down to 22050 kHz for MPEG audio, 22050 or 11025 for AC3). |
|
|
|
@item To have a constant quality (but a variable bitrate), use the option |
|
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst |
|
quality). |
|
|
|
@item When converting video files, you can use the '-sameq' option which |
|
uses the same quality factor in the encoder as in the decoder. |
|
It allows almost lossless encoding. |
|
|
|
@end itemize |
|
|
|
|
|
@chapter external libraries |
|
|
|
FFmpeg can be hooked up with a number of external libraries to add support |
|
for more formats. None of them are used by default, their use has to be |
|
explicitly requested by passing the appropriate flags to @file{./configure}. |
|
|
|
@section AMR |
|
|
|
AMR comes in two different flavors, WB and NB. FFmpeg can make use of the |
|
AMR WB (floating-point mode) and the AMR NB (floating-point mode) reference |
|
decoders and encoders. |
|
|
|
Go to @url{http://www.penguin.cz/~utx/amr} and follow the instructions for |
|
installing the libraries. Then pass @code{--enable-amr-nb} and/or |
|
@code{--enable-amr-wb} to configure to enable the libraries. |
|
|
|
|
|
@chapter Supported File Formats and Codecs |
|
|
|
You can use the @code{-formats} option to have an exhaustive list. |
|
|
|
@section File Formats |
|
|
|
FFmpeg supports the following file formats through the @code{libavformat} |
|
library: |
|
|
|
@multitable @columnfractions .4 .1 .1 .4 |
|
@item Supported File Format @tab Encoding @tab Decoding @tab Comments |
|
@item MPEG audio @tab X @tab X |
|
@item MPEG-1 systems @tab X @tab X |
|
@tab muxed audio and video |
|
@item MPEG-2 PS @tab X @tab X |
|
@tab also known as @code{VOB} file |
|
@item MPEG-2 TS @tab @tab X |
|
@tab also known as DVB Transport Stream |
|
@item ASF@tab X @tab X |
|
@item AVI@tab X @tab X |
|
@item WAV@tab X @tab X |
|
@item Macromedia Flash@tab X @tab X |
|
@tab Only embedded audio is decoded. |
|
@item FLV @tab X @tab X |
|
@tab Macromedia Flash video files |
|
@item Real Audio and Video @tab X @tab X |
|
@item Raw AC3 @tab X @tab X |
|
@item Raw MJPEG @tab X @tab X |
|
@item Raw MPEG video @tab X @tab X |
|
@item Raw PCM8/16 bits, mulaw/Alaw@tab X @tab X |
|
@item Raw CRI ADX audio @tab X @tab X |
|
@item Raw Shorten audio @tab @tab X |
|
@item SUN AU format @tab X @tab X |
|
@item NUT @tab X @tab X @tab NUT Open Container Format |
|
@item QuickTime @tab X @tab X |
|
@item MPEG-4 @tab X @tab X |
|
@tab MPEG-4 is a variant of QuickTime. |
|
@item Raw MPEG4 video @tab X @tab X |
|
@item DV @tab X @tab X |
|
@item 4xm @tab @tab X |
|
@tab 4X Technologies format, used in some games. |
|
@item Playstation STR @tab @tab X |
|
@item Id RoQ @tab @tab X |
|
@tab Used in Quake III, Jedi Knight 2, other computer games. |
|
@item Interplay MVE @tab @tab X |
|
@tab Format used in various Interplay computer games. |
|
@item WC3 Movie @tab @tab X |
|
@tab Multimedia format used in Origin's Wing Commander III computer game. |
|
@item Sega FILM/CPK @tab @tab X |
|
@tab Used in many Sega Saturn console games. |
|
@item Westwood Studios VQA/AUD @tab @tab X |
|
@tab Multimedia formats used in Westwood Studios games. |
|
@item Id Cinematic (.cin) @tab @tab X |
|
@tab Used in Quake II. |
|
@item FLIC format @tab @tab X |
|
@tab .fli/.flc files |
|
@item Sierra VMD @tab @tab X |
|
@tab Used in Sierra CD-ROM games. |
|
@item Sierra Online @tab @tab X |
|
@tab .sol files used in Sierra Online games. |
|
@item Matroska @tab @tab X |
|
@item Electronic Arts Multimedia @tab @tab X |
|
@tab Used in various EA games; files have extensions like WVE and UV2. |
|
@item Nullsoft Video (NSV) format @tab @tab X |
|
@item ADTS AAC audio @tab X @tab X |
|
@item Creative VOC @tab X @tab X @tab Created for the Sound Blaster Pro. |
|
@item American Laser Games MM @tab @tab X |
|
@tab Multimedia format used in games like Mad Dog McCree |
|
@item AVS @tab @tab X |
|
@tab Multimedia format used by the Creature Shock game. |
|
@item Smacker @tab @tab X |
|
@tab Multimedia format used by many games. |
|
@item GXF @tab X @tab X |
|
@tab General eXchange Format SMPTE 360M, used by Thomson Grass Valley playout servers. |
|
@item CIN @tab @tab X |
|
@tab Multimedia format used by Delphine Software games. |
|
@item MXF @tab @tab X |
|
@tab Material eXchange Format SMPTE 377M, used by D-Cinema, broadcast industry. |
|
@item SEQ @tab @tab X |
|
@tab Tiertex .seq files used in the DOS CDROM version of the game Flashback. |
|
@item DXA @tab @tab X |
|
@tab This format is used in non-Windows version of Feeble Files game and |
|
different game cutscenes repacked for use with ScummVM. |
|
@item THP @tab @tab X |
|
@tab Used on the Nintendo GameCube. |
|
@item C93 @tab @tab X |
|
@tab Used in the game Cyberia from Interplay. |
|
@item Bethsoft VID @tab @tab X |
|
@tab Used in some games from Bethesda Softworks. |
|
@item CRYO APC @tab @tab X |
|
@tab Audio format used in some games by CRYO Interactive Entertainment. |
|
@end multitable |
|
|
|
@code{X} means that encoding (resp. decoding) is supported. |
|
|
|
@section Image Formats |
|
|
|
FFmpeg can read and write images for each frame of a video sequence. The |
|
following image formats are supported: |
|
|
|
@multitable @columnfractions .4 .1 .1 .4 |
|
@item Supported Image Format @tab Encoding @tab Decoding @tab Comments |
|
@item PGM, PPM @tab X @tab X |
|
@item PAM @tab X @tab X @tab PAM is a PNM extension with alpha support. |
|
@item PGMYUV @tab X @tab X @tab PGM with U and V components in YUV 4:2:0 |
|
@item JPEG @tab X @tab X @tab Progressive JPEG is not supported. |
|
@item .Y.U.V @tab X @tab X @tab one raw file per component |
|
@item animated GIF @tab X @tab X @tab Only uncompressed GIFs are generated. |
|
@item PNG @tab X @tab X @tab 2 bit and 4 bit/pixel not supported yet. |
|
@item Targa @tab @tab X @tab Targa (.TGA) image format. |
|
@item TIFF @tab X @tab X @tab YUV, JPEG and some extension is not supported yet. |
|
@item SGI @tab X @tab X @tab SGI RGB image format |
|
@end multitable |
|
|
|
@code{X} means that encoding (resp. decoding) is supported. |
|
|
|
@section Video Codecs |
|
|
|
@multitable @columnfractions .4 .1 .1 .4 |
|
@item Supported Codec @tab Encoding @tab Decoding @tab Comments |
|
@item MPEG-1 video @tab X @tab X |
|
@item MPEG-2 video @tab X @tab X |
|
@item MPEG-4 @tab X @tab X |
|
@item MSMPEG4 V1 @tab X @tab X |
|
@item MSMPEG4 V2 @tab X @tab X |
|
@item MSMPEG4 V3 @tab X @tab X |
|
@item WMV7 @tab X @tab X |
|
@item WMV8 @tab X @tab X @tab not completely working |
|
@item WMV9 @tab @tab X @tab not completely working |
|
@item VC1 @tab @tab X |
|
@item H.261 @tab X @tab X |
|
@item H.263(+) @tab X @tab X @tab also known as RealVideo 1.0 |
|
@item H.264 @tab @tab X |
|
@item RealVideo 1.0 @tab X @tab X |
|
@item RealVideo 2.0 @tab X @tab X |
|
@item MJPEG @tab X @tab X |
|
@item lossless MJPEG @tab X @tab X |
|
@item JPEG-LS @tab X @tab X @tab fourcc: MJLS, lossless and near-lossless is supported |
|
@item Apple MJPEG-B @tab @tab X |
|
@item Sunplus MJPEG @tab @tab X @tab fourcc: SP5X |
|
@item DV @tab X @tab X |
|
@item HuffYUV @tab X @tab X |
|
@item FFmpeg Video 1 @tab X @tab X @tab experimental lossless codec (fourcc: FFV1) |
|
@item FFmpeg Snow @tab X @tab X @tab experimental wavelet codec (fourcc: SNOW) |
|
@item Asus v1 @tab X @tab X @tab fourcc: ASV1 |
|
@item Asus v2 @tab X @tab X @tab fourcc: ASV2 |
|
@item Creative YUV @tab @tab X @tab fourcc: CYUV |
|
@item Sorenson Video 1 @tab X @tab X @tab fourcc: SVQ1 |
|
@item Sorenson Video 3 @tab @tab X @tab fourcc: SVQ3 |
|
@item On2 VP3 @tab @tab X @tab still experimental |
|
@item On2 VP5 @tab @tab X @tab fourcc: VP50 |
|
@item On2 VP6 @tab @tab X @tab fourcc: VP60,VP61,VP62 |
|
@item Theora @tab X @tab X @tab still experimental |
|
@item Intel Indeo 3 @tab @tab X |
|
@item FLV @tab X @tab X @tab Sorenson H.263 used in Flash |
|
@item Flash Screen Video @tab X @tab X @tab fourcc: FSV1 |
|
@item ATI VCR1 @tab @tab X @tab fourcc: VCR1 |
|
@item ATI VCR2 @tab @tab X @tab fourcc: VCR2 |
|
@item Cirrus Logic AccuPak @tab @tab X @tab fourcc: CLJR |
|
@item 4X Video @tab @tab X @tab Used in certain computer games. |
|
@item Sony Playstation MDEC @tab @tab X |
|
@item Id RoQ @tab @tab X @tab Used in Quake III, Jedi Knight 2, other computer games. |
|
@item Xan/WC3 @tab @tab X @tab Used in Wing Commander III .MVE files. |
|
@item Interplay Video @tab @tab X @tab Used in Interplay .MVE files. |
|
@item Apple Animation @tab @tab X @tab fourcc: 'rle ' |
|
@item Apple Graphics @tab @tab X @tab fourcc: 'smc ' |
|
@item Apple Video @tab @tab X @tab fourcc: rpza |
|
@item Apple QuickDraw @tab @tab X @tab fourcc: qdrw |
|
@item Cinepak @tab @tab X |
|
@item Microsoft RLE @tab @tab X |
|
@item Microsoft Video-1 @tab @tab X |
|
@item Westwood VQA @tab @tab X |
|
@item Id Cinematic Video @tab @tab X @tab Used in Quake II. |
|
@item Planar RGB @tab @tab X @tab fourcc: 8BPS |
|
@item FLIC video @tab @tab X |
|
@item Duck TrueMotion v1 @tab @tab X @tab fourcc: DUCK |
|
@item Duck TrueMotion v2 @tab @tab X @tab fourcc: TM20 |
|
@item VMD Video @tab @tab X @tab Used in Sierra VMD files. |
|
@item MSZH @tab @tab X @tab Part of LCL |
|
@item ZLIB @tab X @tab X @tab Part of LCL, encoder experimental |
|
@item TechSmith Camtasia @tab @tab X @tab fourcc: TSCC |
|
@item IBM Ultimotion @tab @tab X @tab fourcc: ULTI |
|
@item Miro VideoXL @tab @tab X @tab fourcc: VIXL |
|
@item QPEG @tab @tab X @tab fourccs: QPEG, Q1.0, Q1.1 |
|
@item LOCO @tab @tab X @tab |
|
@item Winnov WNV1 @tab @tab X @tab |
|
@item Autodesk Animator Studio Codec @tab @tab X @tab fourcc: AASC |
|
@item Fraps FPS1 @tab @tab X @tab |
|
@item CamStudio @tab @tab X @tab fourcc: CSCD |
|
@item American Laser Games Video @tab @tab X @tab Used in games like Mad Dog McCree |
|
@item ZMBV @tab X @tab X @tab Encoder works only on PAL8 |
|
@item AVS Video @tab @tab X @tab Video encoding used by the Creature Shock game. |
|
@item Smacker Video @tab @tab X @tab Video encoding used in Smacker. |
|
@item RTjpeg @tab @tab X @tab Video encoding used in NuppelVideo files. |
|
@item KMVC @tab @tab X @tab Codec used in Worms games. |
|
@item VMware Video @tab @tab X @tab Codec used in videos captured by VMware. |
|
@item Cin Video @tab @tab X @tab Codec used in Delphine Software games. |
|
@item Tiertex Seq Video @tab @tab X @tab Codec used in DOS CDROM FlashBack game. |
|
@item DXA Video @tab @tab X @tab Codec originally used in Feeble Files game. |
|
@item AVID DNxHD @tab @tab X @tab aka SMPTE VC3 |
|
@item C93 Video @tab @tab X @tab Codec used in Cyberia game. |
|
@item THP @tab @tab X @tab Used on the Nintendo GameCube. |
|
@item Bethsoft VID @tab @tab X @tab Used in some games from Bethesda Softworks. |
|
@end multitable |
|
|
|
@code{X} means that encoding (resp. decoding) is supported. |
|
|
|
@section Audio Codecs |
|
|
|
@multitable @columnfractions .4 .1 .1 .1 .7 |
|
@item Supported Codec @tab Encoding @tab Decoding @tab Comments |
|
@item MPEG audio layer 2 @tab IX @tab IX |
|
@item MPEG audio layer 1/3 @tab IX @tab IX |
|
@tab MP3 encoding is supported through the external library LAME. |
|
@item AC3 @tab IX @tab IX |
|
@tab liba52 is used internally for decoding. |
|
@item Vorbis @tab X @tab X |
|
@item WMA V1/V2 @tab X @tab X |
|
@item AAC @tab X @tab X |
|
@tab Supported through the external library libfaac/libfaad. |
|
@item Microsoft ADPCM @tab X @tab X |
|
@item MS IMA ADPCM @tab X @tab X |
|
@item QT IMA ADPCM @tab @tab X |
|
@item 4X IMA ADPCM @tab @tab X |
|
@item G.726 ADPCM @tab X @tab X |
|
@item Duck DK3 IMA ADPCM @tab @tab X |
|
@tab Used in some Sega Saturn console games. |
|
@item Duck DK4 IMA ADPCM @tab @tab X |
|
@tab Used in some Sega Saturn console games. |
|
@item Westwood Studios IMA ADPCM @tab @tab X |
|
@tab Used in Westwood Studios games like Command and Conquer. |
|
@item SMJPEG IMA ADPCM @tab @tab X |
|
@tab Used in certain Loki game ports. |
|
@item CD-ROM XA ADPCM @tab @tab X |
|
@item CRI ADX ADPCM @tab X @tab X |
|
@tab Used in Sega Dreamcast games. |
|
@item Electronic Arts ADPCM @tab @tab X |
|
@tab Used in various EA titles. |
|
@item Creative ADPCM @tab @tab X |
|
@tab 16 -> 4, 8 -> 4, 8 -> 3, 8 -> 2 |
|
@item THP ADPCM @tab @tab X |
|
@tab Used on the Nintendo GameCube. |
|
@item RA144 @tab @tab X |
|
@tab Real 14400 bit/s codec |
|
@item RA288 @tab @tab X |
|
@tab Real 28800 bit/s codec |
|
@item RADnet @tab X @tab IX |
|
@tab Real low bitrate AC3 codec, liba52 is used for decoding. |
|
@item AMR-NB @tab X @tab X |
|
@tab Supported through an external library. |
|
@item AMR-WB @tab X @tab X |
|
@tab Supported through an external library. |
|
@item DV audio @tab @tab X |
|
@item Id RoQ DPCM @tab X @tab X |
|
@tab Used in Quake III, Jedi Knight 2, other computer games. |
|
@item Interplay MVE DPCM @tab @tab X |
|
@tab Used in various Interplay computer games. |
|
@item Xan DPCM @tab @tab X |
|
@tab Used in Origin's Wing Commander IV AVI files. |
|
@item Sierra Online DPCM @tab @tab X |
|
@tab Used in Sierra Online game audio files. |
|
@item Apple MACE 3 @tab @tab X |
|
@item Apple MACE 6 @tab @tab X |
|
@item FLAC lossless audio @tab X @tab X |
|
@item Shorten lossless audio @tab @tab X |
|
@item Apple lossless audio @tab @tab X |
|
@tab QuickTime fourcc 'alac' |
|
@item FFmpeg Sonic @tab X @tab X |
|
@tab experimental lossy/lossless codec |
|
@item Qdesign QDM2 @tab @tab X |
|
@tab there are still some distortions |
|
@item Real COOK @tab @tab X |
|
@tab All versions except 5.1 are supported |
|
@item DSP Group TrueSpeech @tab @tab X |
|
@item True Audio (TTA) @tab @tab X |
|
@item Smacker Audio @tab @tab X |
|
@item WavPack Audio @tab @tab X |
|
@item Cin Audio @tab @tab X |
|
@tab Codec used in Delphine Software games. |
|
@item Intel Music Coder @tab @tab X |
|
@item Musepack @tab @tab X |
|
@tab Only SV7 is supported |
|
@item DT$ Coherent Audio @tab @tab X |
|
@item ATRAC 3 @tab @tab X |
|
@end multitable |
|
|
|
@code{X} means that encoding (resp. decoding) is supported. |
|
|
|
@code{I} means that an integer-only version is available, too (ensures high |
|
performance on systems without hardware floating point support). |
|
|
|
@chapter Platform Specific information |
|
|
|
@section BSD |
|
|
|
BSD make will not build FFmpeg, you need to install and use GNU Make |
|
(@file{gmake}). |
|
|
|
@section Windows |
|
|
|
To get help and instructions for using FFmpeg under Windows, check out |
|
the FFmpeg Windows Help Forum at |
|
@url{http://arrozcru.no-ip.org/ffmpeg/}. |
|
|
|
@subsection Native Windows compilation |
|
|
|
@itemize |
|
@item Install the current versions of MSYS and MinGW from |
|
@url{http://www.mingw.org/}. You can find detailed installation |
|
instructions in the download section and the FAQ. |
|
|
|
NOTE: Use at least bash 3.1. Older versions are known to be failing on the |
|
configure script. |
|
|
|
@item If you want to test the FFplay, also download |
|
the MinGW development library of SDL 1.2.x |
|
(@file{SDL-devel-1.2.x-mingw32.tar.gz}) from |
|
@url{http://www.libsdl.org}. Unpack it in a temporary directory, and |
|
unpack the archive @file{i386-mingw32msvc.tar.gz} in the MinGW tool |
|
directory. Edit the @file{sdl-config} script so that it gives the |
|
correct SDL directory when invoked. |
|
|
|
@item Extract the current version of FFmpeg. |
|
|
|
@item Start the MSYS shell (file @file{msys.bat}). |
|
|
|
@item Change to the FFmpeg directory and follow |
|
the instructions of how to compile FFmpeg (file |
|
@file{INSTALL}). Usually, launching @file{./configure} and @file{make} |
|
suffices. If you have problems using SDL, verify that |
|
@file{sdl-config} can be launched from the MSYS command line. |
|
|
|
@item You can install FFmpeg in @file{Program Files/FFmpeg} by typing |
|
@file{make install}. Do not forget to copy @file{SDL.dll} to the place |
|
you launch @file{ffplay} from. |
|
|
|
@end itemize |
|
|
|
Notes: |
|
@itemize |
|
|
|
@item The target @file{make wininstaller} can be used to create a |
|
Nullsoft based Windows installer for FFmpeg and FFplay. @file{SDL.dll} |
|
must be copied to the FFmpeg directory in order to build the |
|
installer. |
|
|
|
@item By using @code{./configure --enable-shared} when configuring FFmpeg, |
|
you can build @file{avcodec.dll} and @file{avformat.dll}. With |
|
@code{make install} you install the FFmpeg DLLs and the associated |
|
headers in @file{Program Files/FFmpeg}. |
|
|
|
@item Visual C++ compatibility: If you used @code{./configure --enable-shared} |
|
when configuring FFmpeg, FFmpeg tries to use the Microsoft Visual |
|
C++ @code{lib} tool to build @code{avcodec.lib} and |
|
@code{avformat.lib}. With these libraries you can link your Visual C++ |
|
code directly with the FFmpeg DLLs (see below). |
|
|
|
@end itemize |
|
|
|
@subsection Visual C++ compatibility |
|
|
|
FFmpeg will not compile under Visual C++ -- and it has too many |
|
dependencies on the GCC compiler to make a port viable. However, |
|
if you want to use the FFmpeg libraries in your own applications, |
|
you can still compile those applications using Visual C++. An |
|
important restriction to this is that you have to use the |
|
dynamically linked versions of the FFmpeg libraries (i.e. the |
|
DLLs), and you have to make sure that Visual-C++-compatible |
|
import libraries are created during the FFmpeg build process. |
|
|
|
This description of how to use the FFmpeg libraries with Visual C++ is |
|
based on Visual C++ 2005 Express Edition Beta 2. If you have a different |
|
version, you might have to modify the procedures slightly. |
|
|
|
Here are the step-by-step instructions for building the FFmpeg libraries |
|
so they can be used with Visual C++: |
|
|
|
@enumerate |
|
|
|
@item Install Visual C++ (if you have not done so already). |
|
|
|
@item Install MinGW and MSYS as described above. |
|
|
|
@item Add a call to @file{vcvars32.bat} (which sets up the environment |
|
variables for the Visual C++ tools) as the first line of |
|
@file{msys.bat}. The standard location for @file{vcvars32.bat} is |
|
@file{C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat}, |
|
and the standard location for @file{msys.bat} is |
|
@file{C:\msys\1.0\msys.bat}. If this corresponds to your setup, add the |
|
following line as the first line of @file{msys.bat}: |
|
|
|
@code{call "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat"} |
|
|
|
@item Start the MSYS shell (file @file{msys.bat}) and type @code{link.exe}. |
|
If you get a help message with the command line options of @code{link.exe}, |
|
this means your environment variables are set up correctly, the |
|
Microsoft linker is on the path and will be used by FFmpeg to |
|
create Visual-C++-compatible import libraries. |
|
|
|
@item Extract the current version of FFmpeg and change to the FFmpeg directory. |
|
|
|
@item Type the command |
|
@code{./configure --enable-shared --disable-static --enable-memalign-hack} |
|
to configure and, if that did not produce any errors, |
|
type @code{make} to build FFmpeg. |
|
|
|
@item The subdirectories @file{libavformat}, @file{libavcodec}, and |
|
@file{libavutil} should now contain the files @file{avformat.dll}, |
|
@file{avformat.lib}, @file{avcodec.dll}, @file{avcodec.lib}, |
|
@file{avutil.dll}, and @file{avutil.lib}, respectively. Copy the three |
|
DLLs to your System32 directory (typically @file{C:\Windows\System32}). |
|
|
|
@end enumerate |
|
|
|
And here is how to use these libraries with Visual C++: |
|
|
|
@enumerate |
|
|
|
@item Create a new console application ("File / New / Project") and then |
|
select "Win32 Console Application". On the appropriate page of the |
|
Application Wizard, uncheck the "Precompiled headers" option. |
|
|
|
@item Write the source code for your application, or, for testing, just |
|
copy the code from an existing sample application into the source file |
|
that Visual C++ has already created for you. (Note that your source |
|
filehas to have a @code{.cpp} extension; otherwise, Visual C++ will not |
|
compile the FFmpeg headers correctly because in C mode, it does not |
|
recognize the @code{inline} keyword.) For example, you can copy |
|
@file{output_example.c} from the FFmpeg distribution (but you will |
|
have to make minor modifications so the code will compile under |
|
C++, see below). |
|
|
|
@item Open the "Project / Properties" dialog box. In the "Configuration" |
|
combo box, select "All Configurations" so that the changes you make will |
|
affect both debug and release builds. In the tree view on the left hand |
|
side, select "C/C++ / General", then edit the "Additional Include |
|
Directories" setting to contain the complete paths to the |
|
@file{libavformat}, @file{libavcodec}, and @file{libavutil} |
|
subdirectories of your FFmpeg directory. Note that the directories have |
|
to be separated using semicolons. Now select "Linker / General" from the |
|
tree view and edit the "Additional Library Directories" setting to |
|
contain the same three directories. |
|
|
|
@item Still in the "Project / Properties" dialog box, select "Linker / Input" |
|
from the tree view, then add the files @file{avformat.lib}, |
|
@file{avcodec.lib}, and @file{avutil.lib} to the end of the "Additional |
|
Dependencies". Note that the names of the libraries have to be separated |
|
using spaces. |
|
|
|
@item Now, select "C/C++ / Code Generation" from the tree view. Select |
|
"Debug" in the "Configuration" combo box. Make sure that "Runtime |
|
Library" is set to "Multi-threaded Debug DLL". Then, select "Release" in |
|
the "Configuration" combo box and make sure that "Runtime Library" is |
|
set to "Multi-threaded DLL". |
|
|
|
@item Click "OK" to close the "Project / Properties" dialog box and build |
|
the application. Hopefully, it should compile and run cleanly. If you |
|
used @file{output_example.c} as your sample application, you will get a |
|
few compiler errors, but they are easy to fix. The first type of error |
|
occurs because Visual C++ does not allow an @code{int} to be converted to |
|
an @code{enum} without a cast. To solve the problem, insert the required |
|
casts (this error occurs once for a @code{CodecID} and once for a |
|
@code{CodecType}). The second type of error occurs because C++ requires |
|
the return value of @code{malloc} to be cast to the exact type of the |
|
pointer it is being assigned to. Visual C++ will complain that, for |
|
example, @code{(void *)} is being assigned to @code{(uint8_t *)} without |
|
an explicit cast. So insert an explicit cast in these places to silence |
|
the compiler. The third type of error occurs because the @code{snprintf} |
|
library function is called @code{_snprintf} under Visual C++. So just |
|
add an underscore to fix the problem. With these changes, |
|
@file{output_example.c} should compile under Visual C++, and the |
|
resulting executable should produce valid video files. |
|
|
|
@end enumerate |
|
|
|
@subsection Cross compilation for Windows with Linux |
|
|
|
You must use the MinGW cross compilation tools available at |
|
@url{http://www.mingw.org/}. |
|
|
|
Then configure FFmpeg with the following options: |
|
@example |
|
./configure --target-os=mingw32 --cross-prefix=i386-mingw32msvc- |
|
@end example |
|
(you can change the cross-prefix according to the prefix chosen for the |
|
MinGW tools). |
|
|
|
Then you can easily test FFmpeg with Wine |
|
(@url{http://www.winehq.com/}). |
|
|
|
@subsection Compilation under Cygwin |
|
|
|
Cygwin works very much like Unix. |
|
|
|
Just install your Cygwin with all the "Base" packages, plus the |
|
following "Devel" ones: |
|
@example |
|
binutils, gcc-core, make, subversion |
|
@end example |
|
|
|
Do not install binutils-20060709-1 (they are buggy on shared builds); |
|
use binutils-20050610-1 instead. |
|
|
|
Then run |
|
|
|
@example |
|
./configure --enable-static --disable-shared |
|
@end example |
|
|
|
to make a static build or |
|
|
|
@example |
|
./configure --enable-shared --disable-static |
|
@end example |
|
|
|
to build shared libraries. |
|
|
|
If you want to build FFmpeg with additional libraries, download Cygwin |
|
"Devel" packages for Ogg and Vorbis from any Cygwin packages repository |
|
and/or SDL, xvid, faac, faad2 packages from Cygwin Ports, |
|
(@url{http://cygwinports.dotsrc.org/}). |
|
|
|
@subsection Crosscompilation for Windows under Cygwin |
|
|
|
With Cygwin you can create Windows binaries that do not need the cygwin1.dll. |
|
|
|
Just install your Cygwin as explained before, plus these additional |
|
"Devel" packages: |
|
@example |
|
gcc-mingw-core, mingw-runtime, mingw-zlib |
|
@end example |
|
|
|
and add some special flags to your configure invocation. |
|
|
|
For a static build run |
|
@example |
|
./configure --target-os=mingw32 --enable-memalign-hack --enable-static --disable-shared --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin |
|
@end example |
|
|
|
and for a build with shared libraries |
|
@example |
|
./configure --target-os=mingw32 --enable-memalign-hack --enable-shared --disable-static --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin |
|
@end example |
|
|
|
@section BeOS |
|
|
|
The configure script should guess the configuration itself. |
|
Networking support is currently not finished. |
|
errno issues fixed by Andrew Bachmann. |
|
|
|
Old stuff: |
|
|
|
François Revol - revol at free dot fr - April 2002 |
|
|
|
The configure script should guess the configuration itself, |
|
however I still did not test building on the net_server version of BeOS. |
|
|
|
FFserver is broken (needs poll() implementation). |
|
|
|
There are still issues with errno codes, which are negative in BeOS, and |
|
that FFmpeg negates when returning. This ends up turning errors into |
|
valid results, then crashes. |
|
(To be fixed) |
|
|
|
@chapter Developers Guide |
|
|
|
@section API |
|
@itemize @bullet |
|
@item libavcodec is the library containing the codecs (both encoding and |
|
decoding). Look at @file{libavcodec/apiexample.c} to see how to use it. |
|
|
|
@item libavformat is the library containing the file format handling (mux and |
|
demux code for several formats). Look at @file{ffplay.c} to use it in a |
|
player. See @file{output_example.c} to use it to generate audio or video |
|
streams. |
|
|
|
@end itemize |
|
|
|
@section Integrating libavcodec or libavformat in your program |
|
|
|
You can integrate all the source code of the libraries to link them |
|
statically to avoid any version problem. All you need is to provide a |
|
'config.mak' and a 'config.h' in the parent directory. See the defines |
|
generated by ./configure to understand what is needed. |
|
|
|
You can use libavcodec or libavformat in your commercial program, but |
|
@emph{any patch you make must be published}. The best way to proceed is |
|
to send your patches to the FFmpeg mailing list. |
|
|
|
@node Coding Rules |
|
@section Coding Rules |
|
|
|
FFmpeg is programmed in the ISO C90 language with a few additional |
|
features from ISO C99, namely: |
|
@itemize @bullet |
|
@item |
|
the @samp{inline} keyword; |
|
@item |
|
@samp{//} comments; |
|
@item |
|
designated struct initializers (@samp{struct s x = @{ .i = 17 @};}) |
|
@item |
|
compound literals (@samp{x = (struct s) @{ 17, 23 @};}) |
|
@end itemize |
|
|
|
These features are supported by all compilers we care about, so we will not |
|
accept patches to remove their use unless they absolutely do not impair |
|
clarity and performance. |
|
|
|
All code must compile with GCC 2.95 and GCC 3.3. Currently, FFmpeg also |
|
compiles with several other compilers, such as the Compaq ccc compiler |
|
or Sun Studio 9, and we would like to keep it that way unless it would |
|
be exceedingly involved. To ensure compatibility, please do not use any |
|
additional C99 features or GCC extensions. Especially watch out for: |
|
@itemize @bullet |
|
@item |
|
mixing statements and declarations; |
|
@item |
|
@samp{long long} (use @samp{int64_t} instead); |
|
@item |
|
@samp{__attribute__} not protected by @samp{#ifdef __GNUC__} or similar; |
|
@item |
|
GCC statement expressions (@samp{(x = (@{ int y = 4; y; @})}). |
|
@end itemize |
|
|
|
Indent size is 4. |
|
The presentation is the one specified by 'indent -i4 -kr -nut'. |
|
The TAB character is forbidden outside of Makefiles as is any |
|
form of trailing whitespace. Commits containing either will be |
|
rejected by the Subversion repository. |
|
|
|
Main priority in FFmpeg is simplicity and small code size (=less |
|
bugs). |
|
|
|
Comments: Use the JavaDoc/Doxygen |
|
format (see examples below) so that code documentation |
|
can be generated automatically. All nontrivial functions should have a comment |
|
above them explaining what the function does, even if it is just one sentence. |
|
All structures and their member variables should be documented, too. |
|
@example |
|
/** |
|
* @@file mpeg.c |
|
* MPEG codec. |
|
* @@author ... |
|
*/ |
|
|
|
/** |
|
* Summary sentence. |
|
* more text ... |
|
* ... |
|
*/ |
|
typedef struct Foobar@{ |
|
int var1; /**< var1 description */ |
|
int var2; ///< var2 description |
|
/** var3 description */ |
|
int var3; |
|
@} Foobar; |
|
|
|
/** |
|
* Summary sentence. |
|
* more text ... |
|
* ... |
|
* @@param my_parameter description of my_parameter |
|
* @@return return value description |
|
*/ |
|
int myfunc(int my_parameter) |
|
... |
|
@end example |
|
|
|
fprintf and printf are forbidden in libavformat and libavcodec, |
|
please use av_log() instead. |
|
|
|
@section Development Policy |
|
|
|
@enumerate |
|
@item |
|
You must not commit code which breaks FFmpeg! (Meaning unfinished but |
|
enabled code which breaks compilation or compiles but does not work or |
|
breaks the regression tests) |
|
You can commit unfinished stuff (for testing etc), but it must be disabled |
|
(#ifdef etc) by default so it does not interfere with other developers' |
|
work. |
|
@item |
|
You do not have to over-test things. If it works for you, and you think it |
|
should work for others, then commit. If your code has problems |
|
(portability, triggers compiler bugs, unusual environment etc) they will be |
|
reported and eventually fixed. |
|
@item |
|
Do not commit unrelated changes together, split them into self-contained |
|
pieces. Also do not forget that if part B depends on part A, but A does not |
|
depend on B, then A can and should be committed first and separate from B. |
|
Keeping changes well split into self-contained parts makes reviewing and |
|
understanding them on the commit log mailing list easier. This also helps |
|
in case of debugging later on. |
|
Also if you have doubts about splitting or not splitting, do not hesitate to |
|
ask/discuss it on the developer mailing list. |
|
@item |
|
Do not change behavior of the program (renaming options etc) without |
|
first discussing it on the ffmpeg-devel mailing list. Do not remove |
|
functionality from the code. Just improve! |
|
|
|
Note: Redundant code can be removed. |
|
@item |
|
Do not commit changes to the build system (Makefiles, configure script) |
|
which change behavior, defaults etc, without asking first. The same |
|
applies to compiler warning fixes, trivial looking fixes and to code |
|
maintained by other developers. We usually have a reason for doing things |
|
the way we do. Send your changes as patches to the ffmpeg-devel mailing |
|
list, and if the code maintainers say OK, you may commit. This does not |
|
apply to files you wrote and/or maintain. |
|
@item |
|
We refuse source indentation and other cosmetic changes if they are mixed |
|
with functional changes, such commits will be rejected and removed. Every |
|
developer has his own indentation style, you should not change it. Of course |
|
if you (re)write something, you can use your own style, even though we would |
|
prefer if the indentation throughout FFmpeg was consistent (Many projects |
|
force a given indentation style - we do not.). If you really need to make |
|
indentation changes (try to avoid this), separate them strictly from real |
|
changes. |
|
|
|
NOTE: If you had to put if()@{ .. @} over a large (> 5 lines) chunk of code, |
|
then either do NOT change the indentation of the inner part within (do not |
|
move it to the right)! or do so in a separate commit |
|
@item |
|
Always fill out the commit log message. Describe in a few lines what you |
|
changed and why. You can refer to mailing list postings if you fix a |
|
particular bug. Comments such as "fixed!" or "Changed it." are unacceptable. |
|
@item |
|
If you apply a patch by someone else, include the name and email address in |
|
the log message. Since the ffmpeg-cvslog mailing list is publicly |
|
archived you should add some SPAM protection to the email address. Send an |
|
answer to ffmpeg-devel (or wherever you got the patch from) saying that |
|
you applied the patch. |
|
@item |
|
When applying patches that have been discussed (at length) on the mailing |
|
list, reference the thread in the log message. |
|
@item |
|
Do NOT commit to code actively maintained by others without permission. |
|
Send a patch to ffmpeg-devel instead. If noone answers within a reasonable |
|
timeframe (12h for build failures and security fixes, 3 days small changes, |
|
1 week for big patches) then commit your patch if you think it is OK. |
|
Also note, the maintainer can simply ask for more time to review! |
|
@item |
|
Subscribe to the ffmpeg-cvslog mailing list. The diffs of all commits |
|
are sent there and reviewed by all the other developers. Bugs and possible |
|
improvements or general questions regarding commits are discussed there. We |
|
expect you to react if problems with your code are uncovered. |
|
@item |
|
Update the documentation if you change behavior or add features. If you are |
|
unsure how best to do this, send a patch to ffmpeg-devel, the documentation |
|
maintainer(s) will review and commit your stuff. |
|
@item |
|
Try to keep important discussions and requests (also) on the public |
|
developer mailing list, so that all developers can benefit from them. |
|
@item |
|
Never write to unallocated memory, never write over the end of arrays, |
|
always check values read from some untrusted source before using them |
|
as array index or other risky things. |
|
@item |
|
Remember to check if you need to bump versions for the specific libav |
|
parts (libavutil, libavcodec, libavformat) you are changing. You need |
|
to change the version integer and the version string. |
|
Incrementing the first component means no backward compatibility to |
|
previous versions (e.g. removal of a function from the public API). |
|
Incrementing the second component means backward compatible change |
|
(e.g. addition of a function to the public API). |
|
Incrementing the third component means a noteworthy binary compatible |
|
change (e.g. encoder bug fix that matters for the decoder). |
|
@item |
|
If you add a new codec, remember to update the changelog, add it to |
|
the supported codecs table in the documentation and bump the second |
|
component of the @file{libavcodec} version number appropriately. If |
|
it has a fourcc, add it to @file{libavformat/avienc.c}, even if it |
|
is only a decoder. |
|
@item |
|
Do not change code to hide warnings without ensuring that the underlying |
|
logic is correct and thus the warning was inappropriate. |
|
@item |
|
If you add a new file, give it a proper license header. Do not copy and |
|
paste it from a random place, use an existing file as template. |
|
@end enumerate |
|
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We think our rules are not too hard. If you have comments, contact us. |
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Note, these rules are mostly borrowed from the MPlayer project. |
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@section Submitting patches |
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First, (@pxref{Coding Rules}) above if you did not yet. |
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When you submit your patch, try to send a unified diff (diff '-up' |
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option). I cannot read other diffs :-) |
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Also please do not submit patches which contain several unrelated changes. |
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Split them into individual self-contained patches; this makes reviewing |
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them much easier. |
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Run the regression tests before submitting a patch so that you can |
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verify that there are no big problems. |
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Patches should be posted as base64 encoded attachments (or any other |
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encoding which ensures that the patch will not be trashed during |
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transmission) to the ffmpeg-devel mailing list, see |
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@url{http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel} |
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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 isn't C99 compliant |
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and has no lrint()') |
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Also please if you send several patches, send each patch as separate mail, |
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do not attach several unrelated patches to the same mail. |
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@section patch submission checklist |
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@enumerate |
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@item |
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Do the regression tests pass with the patch applied? |
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@item |
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Is the patch a unified diff? |
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@item |
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Is the patch against latest FFmpeg SVN? |
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@item |
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Are you subscribed to ffmpeg-dev? |
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(the list is subscribers only due to spam) |
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@item |
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Have you checked that the changes are minimal, so that the same cannot be |
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achieved with a smaller patch and/or simpler final code? |
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@item |
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If the change is to speed critical code, did you benchmark it? |
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@item |
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If you did any benchmarks, did you provide them in the mail? |
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@item |
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Have you checked that the patch does not introduce buffer overflows or |
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other security issues? |
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@item |
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Is the patch created from the root of the source tree, so it can be |
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applied with @code{patch -p0}? |
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@item |
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Does the patch not mix functional and cosmetic changes? |
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@item |
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Did you add tabs or trailing whitespace to the code? Both are forbidden. |
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@item |
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Is the patch attached to the email you send? |
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@item |
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Is the mime type of the patch correct? It should be text/x-diff or |
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text/x-patch or at least text/plain and not application/octet-stream. |
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@item |
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If the patch fixes a bug, did you provide a verbose analysis of the bug? |
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@item |
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If the patch fixes a bug, did you provide enough information, including |
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a sample, so the bug can be reproduced and the fix can be verified? |
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@item |
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Did you provide a verbose summary about what the patch does change? |
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@item |
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Did you provide a verbose explanation why it changes things like it does? |
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@item |
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Did you provide a verbose summary of the user visible advantages and |
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disadvantages if the patch is applied? |
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@item |
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Did you provide an example so we can verify the new feature added by the |
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patch easily? |
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@item |
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If you added a new file, did you insert a license header? It should be |
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taken from FFmpeg, not randomly copied and pasted from somewhere else. |
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@item |
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You should maintain alphabetical order in alphabetically ordered lists as |
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long as doing so does not break API/ABI compatibility. |
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@item |
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Did you provide a suggestion for a clear commit log message? |
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@end enumerate |
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@section Patch review process |
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All patches posted to ffmpeg-devel will be reviewed, unless they contain a |
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clear note that the patch is not for SVN. |
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Reviews and comments will be posted as replies to the patch on the |
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mailing list. The patch submitter then has to take care of every comment, |
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that can be by resubmitting a changed patch or by discussion. Resubmitted |
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patches will themselves be reviewed like any other patch. If at some point |
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a patch passes review with no comments then it is approved, that can for |
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simple and small patches happen immediately while large patches will generally |
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have to be changed and reviewed many times before they are approved. |
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After a patch is approved it will be committed to the repository. |
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We will review all submitted patches, but sometimes we are quite busy so |
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especially for large patches this can take several weeks. |
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When resubmitting patches, please do not make any significant changes |
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not related to the comments received during review. Such patches will |
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be rejected. Instead, submit significant changes or new features as |
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separate patches. |
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@section Regression tests |
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Before submitting a patch (or committing to the repository), you should at least |
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test that you did not break anything. |
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The regression tests build a synthetic video stream and a synthetic |
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audio stream. These are then encoded and decoded with all codecs or |
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formats. The CRC (or MD5) of each generated file is recorded in a |
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result file. A 'diff' is launched to compare the reference results and |
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the result file. |
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The regression tests then go 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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Run 'make test' to test all the codecs and formats. |
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Run 'make fulltest' to test all the codecs, formats and FFserver. |
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[Of course, some patches may change the results of the regression tests. In |
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this case, the reference results of the regression tests shall be modified |
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accordingly]. |
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@bye
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