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@ -38,7 +38,7 @@ No. Windows DLLs are not portable, bloated and often slow. |
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Moreover FFmpeg strives to support all codecs natively. |
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A DLL loader is not conducive to that goal. |
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@section My bugreport/mail to ffmpeg-devel/user has not received any replies. |
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@section My bug report/mail to ffmpeg-devel/user has not received any replies. |
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Likely reasons |
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@itemize |
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@ -69,7 +69,7 @@ documentation. |
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@section Which codecs are supported by Windows? |
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Windows does not support standard formats like MPEG very well, unless you |
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install some additional codecs |
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install some additional codecs. |
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The following list of video codecs should work on most Windows systems: |
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@table @option |
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@ -82,7 +82,7 @@ The following list of video codecs should work on most Windows systems: |
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@item wmv2 |
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.asf only |
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@item mpeg4 |
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only if you have some MPEG-4 codec installed like ffdshow or Xvid |
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Only if you have some MPEG-4 codec like ffdshow or Xvid installed. |
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@item mpeg1 |
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.mpg only |
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@end table |
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@ -96,8 +96,9 @@ The following list of audio codecs should work on most Windows systems: |
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@item adpcm_ima_wav |
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@item adpcm_ms |
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@item pcm |
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always |
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@item mp3 |
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if some MP3 codec like LAME is installed |
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If some MP3 codec like LAME is installed. |
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@end table |
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@ -111,12 +112,12 @@ the gcc developers. Note that we will not add workarounds for gcc bugs. |
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@chapter Usage |
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@section ffmpeg does not work; What is wrong? |
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@section ffmpeg does not work; what is wrong? |
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Try a @code{make distclean} in the ffmpeg source directory before the build. If this does not help see |
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(@url{http://ffmpeg.org/bugreports.html}). |
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@section How do I encode single pictures to movies? |
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@section How do I encode single pictures into movies? |
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First, rename your pictures to follow a numerical sequence. |
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For example, img1.jpg, img2.jpg, img3.jpg,... |
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@ -160,7 +161,8 @@ Beware that there is no "jpeg" codec. Use "mjpeg" instead. |
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@section I get "Unsupported codec (id=86043) for input stream #0.1". What is the problem? |
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This is the Qcelp codec, FFmpeg has no support for that codec currently. Try mencoder/mplayer it might work. |
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This is the Qcelp codec, FFmpeg has no support for that codec currently. |
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Try MEncoder/MPlayer, it might work. |
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@section Why do I see a slight quality degradation with multithreaded MPEG* encoding? |
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@ -170,7 +172,7 @@ quite logical that there is a small reduction of quality. This is not a bug. |
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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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Use @file{-} as file name. |
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@section Why does FFmpeg not decode audio in VOB files? |
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@ -206,7 +208,7 @@ Choose a different codec with the -vcodec command line option. |
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Both Xvid and DivX (version 4+) are implementations of the ISO MPEG-4 |
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standard (note that there are many other coding formats that use this |
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same standard). Thus, use '-vcodec mpeg4' to encode these formats. The |
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same standard). Thus, use '-vcodec mpeg4' to encode in these formats. The |
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default fourcc stored in an MPEG-4-coded file will be 'FMP4'. If you want |
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a different fourcc, use the '-vtag' option. E.g., '-vtag xvid' will |
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force the fourcc 'xvid' to be stored as the video fourcc rather than the |
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@ -362,7 +364,7 @@ examining all of the vbv_delay values and making complicated computations." |
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Yes. Read the Developers Guide of the FFmpeg documentation. Alternatively, |
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examine the source code for one of the many open source projects that |
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already incorporate ffmpeg at (@url{projects.html}). |
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already incorporate FFmpeg at (@url{projects.html}). |
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@section Can you support my C compiler XXX? |
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@ -404,7 +406,7 @@ No. These tools are too bloated and they complicate the build. |
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@section Why not rewrite ffmpeg in object-oriented C++? |
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ffmpeg is already organized in a highly modular manner and does not need to |
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FFmpeg is already organized in a highly modular manner and does not need to |
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be rewritten in a formal object language. Further, many of the developers |
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favor straight C; it works for them. For more arguments on this matter, |
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read "Programming Religion" at (@url{http://www.tux.org/lkml/#s15}). |
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@ -412,14 +414,14 @@ read "Programming Religion" at (@url{http://www.tux.org/lkml/#s15}). |
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@section Why are the ffmpeg programs devoid of debugging symbols? |
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The build process creates ffmpeg_g, ffplay_g, etc. which contain full debug |
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information. Those binaries are strip'd to create ffmpeg, ffplay, etc. If |
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information. Those binaries are stripped to create ffmpeg, ffplay, etc. If |
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you need the debug information, used the *_g versions. |
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@section I do not like the LGPL, can I contribute code under the GPL instead? |
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Yes, as long as the code is optional and can easily and cleanly be placed |
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under #ifdef CONFIG_GPL without breaking anything. So for example a new codec |
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or filter would be OK under GPL while a bugfix to LGPL code would not. |
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or filter would be OK under GPL while a bug fix to LGPL code would not. |
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@section I want to compile xyz.c alone but my compiler produced many errors. |
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Diego Biurrun
17 years ago