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ffmpeg development is now concentrated on the codec and format handling. New developments broke ffserver, so don't expect it to work correctly. If you have time and experience, please help us fix it.
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Even if ffmpeg can read the file format, it may not support all its codecs. Please consult the supported codec list in the ffmpeg documentation.
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Currently, the grabbing stuff does not handle synchronisation correctly. You are free to correct it. A fix is planned.
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If the JPEGs are named img1.jpg, img2.jpg, img3.jpg,..., use:
ffmpeg -i img%d.jpg /tmp/a.mpg |
`%d' is replaced by the image number.
`img%03d.jpg' generates `img001.jpg', `img002.jpg', etc...
The same system is used for the other image formats.
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No. FFmpeg only supports open source codecs. Windows DLLs are not portable, bloated and often slow.
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For multithreaded MPEG* encoding, the encoded slices must be independent, otherwise thread n would practically have to wait for n-1 to finish, so it's quite logical that there is a small reduction of quality. This is not a bug.
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Use `-' as filename.
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The audio is AC3 (a.k.a. A/52). AC3 decoding is an optional component in ffmpeg
as the component that handles AC3 decoding (liba52) is currently released under
the GPL. If you have liba52 installed on your system, enable AC3 decoding
with ./configure --enable-a52
. Take care: by
enabling AC3, you automatically change the license of libavcodec from
LGPL to GPL.
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Windows does not support standard formats like MPEG very well, unless you install some additional codecs
The following list of video codecs should work on most Windows systems:
The following list of audio codecs should work on most Windows systems:
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This is a well-known bug in the bt8x8 driver. For 2.4.26 there is a patch at (http://www.mplayerhq.hu/~michael/bttv-420-2.4.26.patch). This may also apply cleanly to other 2.4-series kernels.
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Pass 'combfilter=1 lumafilter=1' to the bttv driver. Note though that 'combfilter=1' will cause somewhat too strong filtering. A fix is to apply (http://www.mplayerhq.hu/~michael/bttv-comb-2.4.26.patch) or (http://www.mplayerhq.hu/~michael/bttv-comb-2.6.6.patch) and pass 'combfilter=2'.
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Try '-f image -img jpeg test%d.jpg'.
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Some codecs, like MPEG-1/2, only allow a small number of fixed framerates. Choose a different codec with the -vcodec command line option.
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Try a 'make distclean' in the ffmpeg source directory. If this does not help see (ffmpeg-bugreport.html).
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Both XviD and DivX (version 4+) are implementations of the ISO MPEG-4 standard (note that there are many other coding formats that use this same standard). Thus, use '-vcodec mpeg4' to encode these formats. The default fourcc stored in an MPEG-4-coded file will be 'FMP4'. If you want a different fourcc, use the '-vtag' option. E.g., '-vtag xvid' will force the fourcc 'xvid' to be stored as the video fourcc rather than the default.
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Yes. Read the Developers Guide of the FFmpeg documentation. Alternatively, examine the source code for one of the many open source projects that already incorporate ffmpeg at (projects.php).
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No. Only GCC is supported. GCC is ported to most systems available and there
is no need to pollute the source code with #ifdef
s
related to the compiler.
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Yes, but the MinGW tools must be used to compile FFmpeg. You can link the resulting DLLs with any other Windows program. Read the Native Windows Compilation section in the FFmpeg documentation to find more information.
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No. These tools are too bloated and they complicate the build. Moreover, since only `gcc' is supported they would add little advantages in terms of portability.
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ffmpeg is already organized in a highly modular manner and does not need to be rewritten in a formal object language. Further, many of the developers favor straight C; it works for them. For more arguments on this matter, read "Programming Religion" at (http://lkml.org/faq/lkmlfaq-15.html).
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The build process creates ffmpeg_g, ffplay_g, etc. which contain full debug information. Those binaries are strip'd to create ffmpeg, ffplay, etc. If you need the debug information, used the *_g versions.
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1. General Problems
2. Development
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