mirror of https://git.ffmpeg.org/ffmpeg.git
Split general problems section into general questions and usage.
Originally committed as revision 11614 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Diego Biurrun
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doc/faq.texi
182
doc/faq.texi
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@ -8,7 +8,56 @@
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@end titlepage
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@chapter General Problems
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@chapter General Questions
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@section When will the next FFmpeg version be released? / Why are FFmpeg releases so few and far between?
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Like most open source projects FFmpeg suffers from a certain lack of
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manpower. For this reason the developers have to prioritize the work
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they do and putting out releases is not at the top of the list, fixing
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bugs and reviewing patches takes precedence. Please don't complain or
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request more timely and/or frequent releases unless you are willing to
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help out creating them.
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@section I have a problem with an old version of FFmpeg; where should I report it?
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Nowhere. Upgrade to the latest release or if there is no recent release upgrade
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to Subversion HEAD. You could also try to report it. Maybe you will get lucky and
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become the first person in history to get an answer different from "upgrade
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to Subversion HEAD".
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@section Why doesn't FFmpeg support feature [xyz]?
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Because no one has taken on that task yet. FFmpeg development is
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driven by the tasks that are important to the individual developers.
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If there is a feature that is important to you, the best way to get
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it implemented is to undertake the task yourself.
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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 My bugreport/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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@item We are busy and haven't had time yet to read your report or
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investigate the issue.
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@item You didn't follow bugreports.html.
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@item You didn't use Subversion HEAD.
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@item You reported a segmentation fault without gdb output.
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@item You describe a problem but not how to reproduce it.
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@item It's unclear if you use ffmpeg as command line tool or use
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libav* from another application.
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@item You speak about a video having problems on playback but
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not what you use to play it.
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@item We have no faint clue what you are talking about besides
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that it is related to FFmpeg.
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@end itemize
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@section Is there a forum for FFmpeg? I do not like mailing lists.
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Yes, (@url{http://dir.gmane.org/gmane.comp.video.ffmpeg.user}).
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@section I cannot read this file although this format seems to be supported by ffmpeg.
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@ -16,6 +65,48 @@ 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 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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The following list of video codecs should work on most Windows systems:
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@table @option
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@item msmpeg4v2
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.avi/.asf
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@item msmpeg4
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.asf only
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@item wmv1
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.asf only
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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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@item mpeg1
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.mpg only
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@end table
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Note, ASF files often have .wmv or .wma extensions in Windows. It should also
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be mentioned that Microsoft claims a patent on the ASF format, and may sue
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or threaten users who create ASF files with non-Microsoft software. It is
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strongly advised to avoid ASF where possible.
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The following list of audio codecs should work on most Windows systems:
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@table @option
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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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@item mp3
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if some MP3 codec like LAME is installed
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@end table
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@chapter Usage
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@section ffmpeg does not work; What is wrong?
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Try a '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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First, rename your pictures to follow a numerical sequence.
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@ -58,11 +149,6 @@ Applying that to the previous example:
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Beware that there is no "jpeg" codec. Use "mjpeg" instead.
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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 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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@ -85,40 +171,6 @@ Enable AC-3 decoding with @code{./configure --enable-gpl}. Take care: By
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enabling AC-3, you automatically change the license of libavcodec from
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LGPL to GPL.
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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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The following list of video codecs should work on most Windows systems:
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@table @option
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@item msmpeg4v2
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.avi/.asf
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@item msmpeg4
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.asf only
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@item wmv1
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.asf only
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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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@item mpeg1
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.mpg only
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@end table
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Note, ASF files often have .wmv or .wma extensions in Windows. It should also
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be mentioned that Microsoft claims a patent on the ASF format, and may sue
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or threaten users who create ASF files with non-Microsoft software. It is
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strongly advised to avoid ASF where possible.
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The following list of audio codecs should work on most Windows systems:
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@table @option
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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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@item mp3
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if some MP3 codec like LAME is installed
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@end table
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@section Why does the chrominance data seem to be sampled at a different time from the luminance data on bt8x8 captures on Linux?
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This is a well-known bug in the bt8x8 driver. For 2.4.26 there is a patch at
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@ -132,12 +184,6 @@ will cause somewhat too strong filtering. A fix is to apply (@url{http://svn.mpl
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or (@url{http://svn.mplayerhq.hu/michael/trunk/patches/bttv-comb-2.6.6.patch?view=co})
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and pass 'combfilter=2'.
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@section I have a problem with an old version of ffmpeg; where should I report it?
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Nowhere. Upgrade to the latest release or if there is no recent release upgrade
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to Subversion HEAD. You could also try to report it. Maybe you will get lucky and
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become the first person in history to get an answer different from "upgrade
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to Subversion HEAD".
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@section -f jpeg doesn't work.
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Try '-f image2 test%d.jpg'.
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@ -147,11 +193,6 @@ Try '-f image2 test%d.jpg'.
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Some codecs, like MPEG-1/2, only allow a small number of fixed framerates.
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Choose a different codec with the -vcodec command line option.
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@section ffmpeg does not work; What is wrong?
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Try a '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 XviD or DivX video with ffmpeg?
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Both XviD and DivX (version 4+) are implementations of the ISO MPEG-4
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@ -231,24 +272,6 @@ Just create an "input.avs" text file with this single line ...
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For ANY other help on Avisynth, please visit @url{http://www.avisynth.org/}.
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@section My bugreport/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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@item We are busy and haven't had time yet to read your report or
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investigate the issue.
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@item You didn't follow bugreports.html.
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@item You didn't use Subversion HEAD.
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@item You reported a segmentation fault without gdb output.
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@item You describe a problem but not how to reproduce it.
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@item It's unclear if you use ffmpeg as command line tool or use
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libav* from another application.
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@item You speak about a video having problems on playback but
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not what you use to play it.
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@item We have no faint clue what you are talking about besides
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that it is related to FFmpeg.
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@end itemize
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@section How can I join video files?
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A few multimedia containers (MPEG-1, MPEG-2 PS, DV) allow to join video files by
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@ -306,10 +329,6 @@ ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \
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rm temp[12].[av] all.[av]
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@end example
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@section Is there a forum for FFmpeg? I do not like mailing lists.
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Yes, (@url{http://dir.gmane.org/gmane.comp.video.ffmpeg.user}).
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@section FFmpeg does not adhere to the -maxrate setting, some frames are bigger than maxrate/fps.
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Read the MPEG spec about video buffer verifier.
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@ -330,23 +349,6 @@ examining all of the vbv_delay values and making complicated computations."
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@chapter Development
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@section When will the next FFmpeg version be released? / Why are FFmpeg releases so few and far between?
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Like most open source projects FFmpeg suffers from a certain lack of
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manpower. For this reason the developers have to prioritize the work
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they do and putting out releases is not at the top of the list, fixing
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bugs and reviewing patches takes precedence. Please don't complain or
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request more timely and/or frequent releases unless you are willing to
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help out creating them.
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@section Why doesn't FFmpeg support feature [xyz]?
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Because no one has taken on that task yet. FFmpeg development is
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driven by the tasks that are important to the individual developers.
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If there is a feature that is important to you, the best way to get
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it implemented is to undertake the task yourself.
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@section Are there examples illustrating how to use the FFmpeg libraries, particularly libavcodec and libavformat?
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Yes. Read the Developers Guide of the FFmpeg documentation. Alternatively,
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