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85 lines
2.5 KiB
Plaintext
85 lines
2.5 KiB
Plaintext
\input texinfo @c -*- texinfo -*-
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@settitle FFmpeg FAQ
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@titlepage
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@sp 7
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@center @titlefont{FFmpeg FAQ}
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@sp 3
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@end titlepage
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@chapter General Problems
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@section ffserver doesn't not work.
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ffmpeg development is now concentrated on the codec and format
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handling. New developments broke ffserver, so don't expect it to work
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correctly. It is planned to fix it ASAP.
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@section I cannot read this file although this format seems to be suppored by ffmpeg.
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Even if ffmpeg can read the file format, it may not support all its
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codecs. Please consult the supported codec list in the ffmpeg
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documentation.
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@section I get audio/video synchro problems when grabbing.
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Currently, the grabbing stuff does not handle synchronisation
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correctly. You are free to correct it. It is planned to fix it ASAP.
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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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@example
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ffmpeg -i img%d.jpg /tmp/a.mpg
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@end example
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@samp{%d} is replaced by the image number.
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@file{img%03d.jpg} generates @file{img001.jpg}, @file{img002.jpg}, etc...
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The same system is used for the other image formats.
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@section FFmpeg does not support codec XXX. Can you include a Windows DLL loader to support it ?
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No. FFmpeg only supports open source codecs. Windows DLLs are not
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portable, bloated and often slow.
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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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@section Why Audio is not decoded in VOB files ?
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AC3 decoding is optional as the codec is currently released under the
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GPL. Enable it with @code{./configure --enable-a52}. Take care: by
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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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@chapter Development
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@section Are there examples of use of the FFmpeg libraries libavcodec and libavformat ?
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Yes. Read the Developers Guide of the FFmpeg documentation.
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@section Can you support my C compiler XXX ?
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No. Only GCC is supported. GCC is ported on most systems available and I
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don't see the need to pollute the source code with @code{#ifdef}s
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related to the compiler.
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@section I want to use ffmpeg or libavcodec under Windows. Can you support my proprietary C compiler XXX ?
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No. Use @code{mingw-gcc} available at @url{http://www.mingw.org/} to
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compile the code. It generates object files fully compatible with other
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windows compilers.
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@section Can you add automake, libtool or autoconf support ?
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No. These tools are too blowted and they complicate the build. Moreover,
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since only @samp{gcc} is supported they would add little advantages in
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terms of portability.
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@bye
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