mirror of https://git.ffmpeg.org/ffmpeg.git
updated FAQ - converted it to texinfo
Originally committed as revision 1158 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Fabrice Bellard
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doc/FAQ
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doc/FAQ
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1) 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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2) I cannot read this AVI file.
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Even if ffmpeg can read the AVI format, it does not support all its
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codecs. Please consult the supported codec list on the ffmpeg project
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page.
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3) I cannot read this Real Audio/Video file.
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See (2). ffmpeg only supports Real Video 1.0 and AC3 as Real
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codecs. It mean that you cannot view files encoded with real tools
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after version 5.0.
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4) 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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5) 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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ffmpeg -i img%d.jpg /tmp/a.mpg
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'%d' is replaced by the image number.
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'img%03d.jpg' generates img001.jpg, img002.jpg, etc...
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The same system is used for the other image formats.
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6) FFmpeg does not support codec XYZ. Can you include a Windows DLL
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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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<HTML>
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<HEAD>
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<!-- Created by texi2html 1.56k from faq.texi on 4 November 2002 -->
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<TITLE>FFmpeg FAQ</TITLE>
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</HEAD>
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<BODY>
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<H1>FFmpeg FAQ</H1>
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<P>
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<P><HR><P>
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<H1>Table of Contents</H1>
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<UL>
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<LI><A NAME="TOC1" HREF="faq.html#SEC1">1. General Problems</A>
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<UL>
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<LI><A NAME="TOC2" HREF="faq.html#SEC2">1.1 ffserver doesn't not work.</A>
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<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>
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<LI><A NAME="TOC4" HREF="faq.html#SEC4">1.3 I get audio/video synchro problems when grabbing.</A>
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<LI><A NAME="TOC5" HREF="faq.html#SEC5">1.4 How do I encode jpegs to another format ?</A>
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<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>
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</UL>
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<LI><A NAME="TOC7" HREF="faq.html#SEC7">2. Development</A>
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<UL>
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<LI><A NAME="TOC8" HREF="faq.html#SEC8">2.1 Can you support my C compiler XXX ?</A>
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<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>
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<LI><A NAME="TOC10" HREF="faq.html#SEC10">2.3 Can you add automake, libtool or autoconf support ?</A>
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</UL>
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</UL>
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<P><HR><P>
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<P>
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FFmpeg FAQ
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<H1><A NAME="SEC1" HREF="faq.html#TOC1">1. General Problems</A></H1>
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<H2><A NAME="SEC2" HREF="faq.html#TOC2">1.1 ffserver doesn't not work.</A></H2>
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<P>
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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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<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>
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<P>
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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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<H2><A NAME="SEC4" HREF="faq.html#TOC4">1.3 I get audio/video synchro problems when grabbing.</A></H2>
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<P>
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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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<H2><A NAME="SEC5" HREF="faq.html#TOC5">1.4 How do I encode jpegs to another format ?</A></H2>
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<P>
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If the jpegs are named img1.jpg, img2.jpg, img3.jpg,..., use:
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<PRE>
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ffmpeg -i img%d.jpg /tmp/a.mpg
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</PRE>
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<P>
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<SAMP>`%d'</SAMP> is replaced by the image number.
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<P>
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<TT>`img%03d.jpg'</TT> generates <TT>`img001.jpg'</TT>, <TT>`img002.jpg'</TT>, etc...
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<P>
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The same system is used for the other image formats.
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<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>
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<P>
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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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<H1><A NAME="SEC7" HREF="faq.html#TOC7">2. Development</A></H1>
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<H2><A NAME="SEC8" HREF="faq.html#TOC8">2.1 Can you support my C compiler XXX ?</A></H2>
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<P>
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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</CODE>s
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related to the compiler.
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<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>
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<P>
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No. Use <CODE>mingw-gcc</CODE> available at <A HREF="http://www.mingw.org/">http://www.mingw.org/</A> 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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<H2><A NAME="SEC10" HREF="faq.html#TOC10">2.3 Can you add automake, libtool or autoconf support ?</A></H2>
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<P>
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No. These tools are too blowted and they complicate the build. Moreover,
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since only <SAMP>`gcc'</SAMP> is supported they would add little advantages in
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terms of portability.
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<P><HR><P>
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This document was generated on 4 November 2002 using
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<A HREF="http://wwwinfo.cern.ch/dis/texi2html/">texi2html</A> 1.56k.
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</BODY>
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</HTML>
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@ -0,0 +1,69 @@
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\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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@chapter Development
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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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