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148 lines
4.1 KiB
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<TITLE>FFmpeg FAQ</TITLE> |
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<H1>FFmpeg FAQ</H1> |
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<H1>Table of Contents</H1> |
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<LI><A NAME="TOC1" HREF="faq.html#SEC1">1. General Problems</A> |
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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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<LI><A NAME="TOC7" HREF="faq.html#SEC7">1.6 How can I read from the standard input or write to the standard output ?</A> |
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<LI><A NAME="TOC8" HREF="faq.html#SEC8">2. Development</A> |
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<LI><A NAME="TOC9" HREF="faq.html#SEC9">2.1 Can you support my C compiler XXX ?</A> |
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<LI><A NAME="TOC10" HREF="faq.html#SEC10">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="TOC11" HREF="faq.html#SEC11">2.3 Can you add automake, libtool or autoconf support ?</A> |
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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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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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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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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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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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<SAMP>`%d'</SAMP> is replaced by the image number. |
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<TT>`img%03d.jpg'</TT> generates <TT>`img001.jpg'</TT>, <TT>`img002.jpg'</TT>, etc... |
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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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No. FFmpeg only supports open source codecs. Windows DLLs are not |
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portable, bloated and often slow. |
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<H2><A NAME="SEC7" HREF="faq.html#TOC7">1.6 How can I read from the standard input or write to the standard output ?</A></H2> |
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Use <TT>`-'</TT> as filename. |
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<H1><A NAME="SEC8" HREF="faq.html#TOC8">2. Development</A></H1> |
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<H2><A NAME="SEC9" HREF="faq.html#TOC9">2.1 Can you support my C compiler XXX ?</A></H2> |
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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="SEC10" HREF="faq.html#TOC10">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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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="SEC11" HREF="faq.html#TOC11">2.3 Can you add automake, libtool or autoconf support ?</A></H2> |
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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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