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updated FAQ - converted it to texinfo

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Originally committed as revision 1158 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Fabrice Bellard 23 years ago
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1) ffserver doesn't not work.
ffmpeg development is now concentrated on the codec and format
handling. New developments broke ffserver, so don't expect it to work
correctly. It is planned to fix it ASAP.
2) I cannot read this AVI file.
Even if ffmpeg can read the AVI format, it does not support all its
codecs. Please consult the supported codec list on the ffmpeg project
page.
3) I cannot read this Real Audio/Video file.
See (2). ffmpeg only supports Real Video 1.0 and AC3 as Real
codecs. It mean that you cannot view files encoded with real tools
after version 5.0.
4) I get audio/video synchro problems when grabbing.
Currently, the grabbing stuff does not handle synchronisation
correctly. You are free to correct it. It is planned to fix it ASAP.
5) How do I encode jpegs to another format ?
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.
6) FFmpeg does not support codec XYZ. Can you include a Windows DLL
loader to support it ?
No ! FFmpeg only supports open source codecs. Windows DLLs are not
portable, bloated and often slow.

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<HTML>
<HEAD>
<!-- Created by texi2html 1.56k from faq.texi on 4 November 2002 -->
<TITLE>FFmpeg FAQ</TITLE>
</HEAD>
<BODY>
<H1>FFmpeg FAQ</H1>
<P>
<P><HR><P>
<H1>Table of Contents</H1>
<UL>
<LI><A NAME="TOC1" HREF="faq.html#SEC1">1. General Problems</A>
<UL>
<LI><A NAME="TOC2" HREF="faq.html#SEC2">1.1 ffserver doesn't not work.</A>
<LI><A NAME="TOC3" HREF="faq.html#SEC3">1.2 I cannot read this file although this format seems to be suppored by ffmpeg.</A>
<LI><A NAME="TOC4" HREF="faq.html#SEC4">1.3 I get audio/video synchro problems when grabbing.</A>
<LI><A NAME="TOC5" HREF="faq.html#SEC5">1.4 How do I encode jpegs to another format ?</A>
<LI><A NAME="TOC6" HREF="faq.html#SEC6">1.5 FFmpeg does not support codec XXX. Can you include a Windows DLL loader to support it ?</A>
</UL>
<LI><A NAME="TOC7" HREF="faq.html#SEC7">2. Development</A>
<UL>
<LI><A NAME="TOC8" HREF="faq.html#SEC8">2.1 Can you support my C compiler XXX ?</A>
<LI><A NAME="TOC9" HREF="faq.html#SEC9">2.2 I want to use ffmpeg or libavcodec under Windows. Can you support my proprietary C compiler XXX ?</A>
<LI><A NAME="TOC10" HREF="faq.html#SEC10">2.3 Can you add automake, libtool or autoconf support ?</A>
</UL>
</UL>
<P><HR><P>
<P>
FFmpeg FAQ
<H1><A NAME="SEC1" HREF="faq.html#TOC1">1. General Problems</A></H1>
<H2><A NAME="SEC2" HREF="faq.html#TOC2">1.1 ffserver doesn't not work.</A></H2>
<P>
ffmpeg development is now concentrated on the codec and format
handling. New developments broke ffserver, so don't expect it to work
correctly. It is planned to fix it ASAP.
<H2><A NAME="SEC3" HREF="faq.html#TOC3">1.2 I cannot read this file although this format seems to be suppored by ffmpeg.</A></H2>
<P>
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.
<H2><A NAME="SEC4" HREF="faq.html#TOC4">1.3 I get audio/video synchro problems when grabbing.</A></H2>
<P>
Currently, the grabbing stuff does not handle synchronisation
correctly. You are free to correct it. It is planned to fix it ASAP.
<H2><A NAME="SEC5" HREF="faq.html#TOC5">1.4 How do I encode jpegs to another format ?</A></H2>
<P>
If the jpegs are named img1.jpg, img2.jpg, img3.jpg,..., use:
<PRE>
ffmpeg -i img%d.jpg /tmp/a.mpg
</PRE>
<P>
<SAMP>`%d'</SAMP> is replaced by the image number.
<P>
<TT>`img%03d.jpg'</TT> generates <TT>`img001.jpg'</TT>, <TT>`img002.jpg'</TT>, etc...
<P>
The same system is used for the other image formats.
<H2><A NAME="SEC6" HREF="faq.html#TOC6">1.5 FFmpeg does not support codec XXX. Can you include a Windows DLL loader to support it ?</A></H2>
<P>
No. FFmpeg only supports open source codecs. Windows DLLs are not
portable, bloated and often slow.
<H1><A NAME="SEC7" HREF="faq.html#TOC7">2. Development</A></H1>
<H2><A NAME="SEC8" HREF="faq.html#TOC8">2.1 Can you support my C compiler XXX ?</A></H2>
<P>
No. Only GCC is supported. GCC is ported on most systems available and I
don't see the need to pollute the source code with <CODE>#ifdef</CODE>s
related to the compiler.
<H2><A NAME="SEC9" HREF="faq.html#TOC9">2.2 I want to use ffmpeg or libavcodec under Windows. Can you support my proprietary C compiler XXX ?</A></H2>
<P>
No. Use <CODE>mingw-gcc</CODE> available at <A HREF="http://www.mingw.org/">http://www.mingw.org/</A> to
compile the code. It generates object files fully compatible with other
windows compilers.
<H2><A NAME="SEC10" HREF="faq.html#TOC10">2.3 Can you add automake, libtool or autoconf support ?</A></H2>
<P>
No. These tools are too blowted and they complicate the build. Moreover,
since only <SAMP>`gcc'</SAMP> is supported they would add little advantages in
terms of portability.
<P><HR><P>
This document was generated on 4 November 2002 using
<A HREF="http://wwwinfo.cern.ch/dis/texi2html/">texi2html</A>&nbsp;1.56k.
</BODY>
</HTML>

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\input texinfo @c -*- texinfo -*-
@settitle FFmpeg FAQ
@titlepage
@sp 7
@center @titlefont{FFmpeg FAQ}
@sp 3
@end titlepage
@chapter General Problems
@section ffserver doesn't not work.
ffmpeg development is now concentrated on the codec and format
handling. New developments broke ffserver, so don't expect it to work
correctly. It is planned to fix it ASAP.
@section I cannot read this file although this format seems to be suppored by ffmpeg.
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.
@section I get audio/video synchro problems when grabbing.
Currently, the grabbing stuff does not handle synchronisation
correctly. You are free to correct it. It is planned to fix it ASAP.
@section How do I encode jpegs to another format ?
If the jpegs are named img1.jpg, img2.jpg, img3.jpg,..., use:
@example
ffmpeg -i img%d.jpg /tmp/a.mpg
@end example
@samp{%d} is replaced by the image number.
@file{img%03d.jpg} generates @file{img001.jpg}, @file{img002.jpg}, etc...
The same system is used for the other image formats.
@section FFmpeg does not support codec XXX. Can you include a Windows DLL loader to support it ?
No. FFmpeg only supports open source codecs. Windows DLLs are not
portable, bloated and often slow.
@chapter Development
@section Can you support my C compiler XXX ?
No. Only GCC is supported. GCC is ported on most systems available and I
don't see the need to pollute the source code with @code{#ifdef}s
related to the compiler.
@section I want to use ffmpeg or libavcodec under Windows. Can you support my proprietary C compiler XXX ?
No. Use @code{mingw-gcc} available at @url{http://www.mingw.org/} to
compile the code. It generates object files fully compatible with other
windows compilers.
@section Can you add automake, libtool or autoconf support ?
No. These tools are too blowted and they complicate the build. Moreover,
since only @samp{gcc} is supported they would add little advantages in
terms of portability.
@bye
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