Nowhere. We do not support old Libav versions in any way, we simply lack
the time, motivation and manpower to do so. If you have a problem with an
old version of Libav, upgrade to the latest git snapshot. If you
-still experience the problem, then you can report it according to the
-guidelines in @url{http://libav.org/bugreports.html}.
+still experience the problem, then you can report it according to our
+@uref{http://libav.org/bugreports.html, bug reporting guidelines}.
@section Why doesn't Libav support feature [xyz]?
@itemize
@item We are busy and haven't had time yet to read your report or
investigate the issue.
-@item You didn't follow @url{http://libav.org/bugreports.html}.
+@item You did not follow our
+ @uref{http://libav.org/bugreports.html, bug reporting guidelines}.
@item You didn't use git master.
@item You reported a segmentation fault without gdb output.
@item You describe a problem but not how to reproduce it.
.asf only
@item mpeg4
Only if you have some MPEG-4 codec like ffdshow or Xvid installed.
-@item mpeg1
+@item mpeg1video
.mpg only
@end table
Note, ASF files often have .wmv or .wma extensions in Windows. It should also
@table @option
@item adpcm_ima_wav
@item adpcm_ms
-@item pcm
+@item pcm_s16le
always
-@item mp3
+@item libmp3lame
If some MP3 codec like LAME is installed.
@end table
@section ffmpeg does not work; what is wrong?
-Try a @code{make distclean} in the ffmpeg source directory before the build. If this does not help see
-(@url{http://libav.org/bugreports.html}).
+Try a @code{make distclean} in the ffmpeg source directory before the build.
+If this does not help see our
+@uref{http://libav.org/bugreports.html, bug reporting guidelines}.
@section How do I encode single pictures into movies?
@item non-working stuff
B-frames
@item example command line
-ffmpeg -i input -acodec libfaac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +mv4 -trellis 2 -aic 2 -cmp 2 -subcmp 2 -s 320x180 -metadata title=X output.mp4
+ffmpeg -i input -acodec libfaac -ab 128k -vcodec mpeg4 -b 1200k -mbd 2 -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -s 320x180 -metadata title=X output.mp4
@end table
@section How do I encode videos which play on the PSP?
@item non-working stuff
B-frames
@item example command line
-ffmpeg -i input -acodec libfaac -ab 128kb -vcodec mpeg4 -b 1200kb -ar 24000 -mbd 2 -flags +mv4 -trellis 2 -aic 2 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -metadata title=X -f psp output.mp4
+ffmpeg -i input -acodec libfaac -ab 128k -vcodec mpeg4 -b 1200k -ar 24000 -mbd 2 -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -metadata title=X -f psp output.mp4
@item needed stuff for H.264
-acodec libfaac -vcodec libx264 width*height<=76800 width%16=0? height%16=0? -ar 48000 -coder 1 -r 30000/1001 or 15000/1001 -f psp
@item working stuff for H.264
@item non-working stuff for H.264
CAVLC
@item example command line
-ffmpeg -i input -acodec libfaac -ab 128kb -vcodec libx264 -b 1200kb -ar 48000 -mbd 2 -coder 1 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -metadata title=X -f psp -flags loop -trellis 2 -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 output.mp4
+ffmpeg -i input -acodec libfaac -ab 128k -vcodec libx264 -b 1200k -ar 48000 -mbd 2 -coder 1 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -metadata title=X -f psp -flags loop -trellis 2 -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 output.mp4
@item higher resolution for newer PSP firmwares, width<=480, height<=272
-vcodec libx264 -level 21 -coder 1 -f psp
@item example command line
-ffmpeg -i input -acodec libfaac -ab 128kb -ac 2 -ar 48000 -vcodec libx264 -level 21 -b 640kb -coder 1 -f psp -flags +loop -trellis 2 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -g 250 -s 480x272 output.mp4
+ffmpeg -i input -acodec libfaac -ab 128k -ac 2 -ar 48000 -vcodec libx264 -level 21 -b 640k -coder 1 -f psp -flags +loop -trellis 2 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -g 250 -s 480x272 output.mp4
@end table
@section Which are good parameters for encoding high quality MPEG-4?
@example
DirectShowSource("C:\path to your file\yourfile.asf")
@end example
-... and then feed that text file to FFmpeg:
+... and then feed that text file to ffmpeg:
@example
ffmpeg -i input.avs
@end example
-For ANY other help on Avisynth, please visit @url{http://www.avisynth.org/}.
+For ANY other help on Avisynth, please visit the
+@uref{http://www.avisynth.org/, Avisynth homepage}.
@section How can I join video files?
rm temp[12].[av] all.[av]
@end example
-@section FFmpeg does not adhere to the -maxrate setting, some frames are bigger than maxrate/fps.
+@section The ffmpeg program does not respect the -maxrate setting, some frames are bigger than maxrate/fps.
Read the MPEG spec about video buffer verifier.
Libav is already organized in a highly modular manner and does not need to
be rewritten in a formal object language. Further, many of the developers
favor straight C; it works for them. For more arguments on this matter,
-read "Programming Religion" at (@url{http://www.tux.org/lkml/#s15}).
-
-@section Why are the ffmpeg programs devoid of debugging symbols?
-
-The build process creates ffmpeg_g, ffplay_g, etc. which contain full debug
-information. Those binaries are stripped to create ffmpeg, ffplay, etc. If
-you need the debug information, use the *_g versions.
+read @uref{http://www.tux.org/lkml/#s15, "Programming Religion"}.
@section I do not like the LGPL, can I contribute code under the GPL instead?
See @url{http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html#faq-32.3}
+@section I'm using libavutil from within my C++ application but the compiler complains about 'UINT64_C' was not declared in this scope
+
+Libav is a pure C project using C99 math features, in order to enable C++
+to use them you have to append -D__STDC_CONSTANT_MACROS to your CXXFLAGS
+
@section I have a file in memory / a API different from *open/*read/ libc how do I use it with libavformat?
You have to implement a URLProtocol, see @file{libavformat/file.c} in
projects / ffmpeg / blobdiff