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85 lines
2.6 KiB
85 lines
2.6 KiB
\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 Can I use FFmpeg or libavcodec under Windows ? |
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Yes, but the MinGW tools @emph{must} be used to compile FFmpeg. You |
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can link the resulting DLLs with any other Windows program. Read the |
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@emph{Native Windows Compilation} section in the FFmpeg documentation |
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to have more information. |
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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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