Revision 831ec935 doc/faq.texi

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doc/faq.texi
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Moreover FFmpeg strives to support all codecs natively.
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A DLL loader is not conducive to that goal.
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@section My bugreport/mail to ffmpeg-devel/user has not received any replies.
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@section My bug report/mail to ffmpeg-devel/user has not received any replies.
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Likely reasons
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@itemize
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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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install some additional codecs
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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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@table @option
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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 MPEG-4 codec installed like ffdshow or Xvid
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Only if you have some MPEG-4 codec like ffdshow or Xvid installed.
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@item mpeg1
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.mpg only
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@end table
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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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always
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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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@chapter Usage
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@section ffmpeg does not work; What is wrong?
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@section ffmpeg does not work; what is wrong?
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Try a @code{make distclean} in the ffmpeg source directory before the build. If this does not help see
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(@url{http://ffmpeg.org/bugreports.html}).
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@section How do I encode single pictures to movies?
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@section How do I encode single pictures into movies?
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First, rename your pictures to follow a numerical sequence.
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For example, img1.jpg, img2.jpg, img3.jpg,...
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@section I get "Unsupported codec (id=86043) for input stream #0.1". What is the problem?
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This is the Qcelp codec, FFmpeg has no support for that codec currently. Try mencoder/mplayer it might work.
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This is the Qcelp codec, FFmpeg has no support for that codec currently.
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Try MEncoder/MPlayer, it might work.
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@section Why do I see a slight quality degradation with multithreaded MPEG* encoding?
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@section How can I read from the standard input or write to the standard output?
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Use @file{-} as filename.
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Use @file{-} as file name.
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@section Why does FFmpeg not decode audio in VOB files?
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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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same standard). Thus, use '-vcodec mpeg4' to encode in these formats. The
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default fourcc stored in an MPEG-4-coded file will be 'FMP4'. 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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Yes. Read the Developers Guide of the FFmpeg documentation. Alternatively,
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examine the source code for one of the many open source projects that
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already incorporate ffmpeg at (@url{projects.html}).
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already incorporate FFmpeg at (@url{projects.html}).
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@section Can you support my C compiler XXX?
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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 and 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://www.tux.org/lkml/#s15}).
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@section Why are the ffmpeg programs devoid of debugging symbols?
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The build process creates ffmpeg_g, ffplay_g, etc. which contain full debug
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information. Those binaries are strip'd to create ffmpeg, ffplay, etc. If
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information. Those binaries are stripped to create ffmpeg, ffplay, etc. If
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you need the debug information, used the *_g versions.
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@section I do not like the LGPL, can I contribute code under the GPL instead?
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Yes, as long as the code is optional and can easily and cleanly be placed
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under #ifdef CONFIG_GPL without breaking anything. So for example a new codec
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or filter would be OK under GPL while a bugfix to LGPL code would not.
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or filter would be OK under GPL while a bug fix to LGPL code would not.
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@section I want to compile xyz.c alone but my compiler produced many errors.
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