Revision 87759af9 doc/faq.texi

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doc/faq.texi
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Currently, the grabbing stuff does not handle synchronisation
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correctly. You are free to correct it. A fix is planned.
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@section How do I encode jpegs to another format ?
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@section How do I encode JPEGs to another format ?
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If the jpegs are named img1.jpg, img2.jpg, img3.jpg,..., use:
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If the JPEGs are named img1.jpg, img2.jpg, img3.jpg,..., use:
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@example
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  ffmpeg -i img%d.jpg /tmp/a.mpg
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enabling AC3, you automatically change the license of libavcodec from
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LGPL to GPL.
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@section Which codecs are supported by windows ?
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@section Which codecs are supported by Windows ?
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Windows does not support standard formats like mpeg very well, unless you 
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Windows does not support standard formats like MPEG very well, unless you 
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install some additional codecs
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The following list of video codecs should work on most windows systems
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The following list of video codecs should work on most Windows systems
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@table @option
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@item msmpeg4v2
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.avi/.asf
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@item wmv2
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.asf only
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@item mpeg4
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only if you have some mpeg4 codec installed like ffdshow or xvid
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only if you have some MPEG-4 codec installed like ffdshow or xvid
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@item mpeg1
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.mpg only
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@end table
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Note, asf files often have .wmv or .wma extensions in windows. It should also 
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Note, ASF files often have .wmv or .wma extensions in Windows. It should also 
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be mentioned that Microsoft claims a patent on the ASF format, and may sue 
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or threaten users who create ASF files with non-Microsoft software. It is
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strongly advised to avoid ASF where possible.
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The following list of audio codecs should work on most windows systems
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The following list of audio codecs should work on most Windows systems
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@table @option
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@item adpcm_ima_wav
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@item adpcm_ms
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@item pcm
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@item mp3
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if some mp3 codec like lame is installed
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if some mp3 codec like LAME is installed
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@end table
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@section Why does the chrominance data seem to be sampled at a different time than the luminance data on bt8x8 captures on Linux?
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(@url{http://www.mplayerhq.hu/~michael/bttv-420-2.4.26.patch}). This may also
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apply cleanly to other 2.4-series kernels.
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@section How do I avoid the ugly aliassing artifacts in bt8x8 captures on linux?
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@section How do I avoid the ugly aliasing artifacts in bt8x8 captures on Linux?
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Pass 'combfilter=1 lumafilter=1' to the bttv driver. Note though that 'combfilter=1'
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will cause somewhat too strong filtering. A fix is to apply (@url{http://www.mplayerhq.hu/~michael/bttv-comb-2.4.26.patch})
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@section I have a problem with an old version of ffmpeg; where should i report it?
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Nowhere. Upgrade to the latest release or if there is no recent release upgrade
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to cvs. You could also try to report it. Maybe you will get lucky and
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become the first person in history to get a different answer from "upgrade
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to cvs".
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to CVS. You could also try to report it. Maybe you will get lucky and
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become the first person in history to get an answer different from "upgrade
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to CVS".
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@section -f jpeg doesnt work.
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try '-f image -img jpeg test%d.jpg'
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Try '-f image -img jpeg test%d.jpg'.
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@section Why can I not change the framerate?
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Some codecs, like MPEG 1/2 only allow a small number of fixed framerates.
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Some codecs, like MPEG-1/2 only allow a small number of fixed framerates.
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Choose a different codec with the -vcodec command line option.
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@section ffmpeg does not work; What is wrong?
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Try a 'make distclean' in the ffmpeg source directory. If this does not help see
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(@url{ffmpeg-bugreport.html}).
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@section How do I encode XviD or DIVX video with ffmpeg?
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@section How do I encode XviD or DivX video with ffmpeg?
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Both XviD and DIVX (version 4+) are implementations of the ISO MPEG-4
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Both XviD and DivX (version 4+) are implementations of the ISO MPEG-4
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standard (note that there are many other coding formats that use this
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same standard). Thus, use '-vcodec mpeg4' to encode these formats. The
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default fourcc stored in a MPEG-4-coded file will be 'DIVX'. If you want
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default fourcc stored in an MPEG-4-coded file will be 'DIVX'. If you want
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a different fourcc, use the '-vtag' option. E.g., '-vtag xvid' will 
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force the fourcc 'xvid' to be stored as the video fourcc rather than the 
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default.
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@section Why not rewrite ffmpeg in object-oriented C++ ?
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ffmpeg is already organized in a highly modular manner does not need to
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ffmpeg is already organized in a highly modular manner and does not need to
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be rewritten in a formal object language. Further, many of the developers 
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favor straight C; it works for them. For more arguments on this matter,
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read "Programming Religion" at (@url{http://lkml.org/faq/lkmlfaq-15.html}).

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