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| author | Michael Niedermayer <michaelni@gmx.at> | 2007-08-06 00:19:17 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2007-08-06 00:19:17 +0000 |
| commit | 3b36389af09663cf31637ac22ab85381e94ba1ae (patch) | |
| tree | 0d915190d94523d9f6ebce68f520e2ed1e2d9090 | |
| parent | f754bfb962205ffa8703c5fe68754121b424123f (diff) | |
| download | ffmpeg-3b36389af09663cf31637ac22ab85381e94ba1ae.tar.gz | |
vbv related questions
Originally committed as revision 9958 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | doc/faq.texi | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/doc/faq.texi b/doc/faq.texi index 5d4e5c934a..050e810287 100644 --- a/doc/faq.texi +++ b/doc/faq.texi @@ -315,6 +315,23 @@ yes, (@url{http://dir.gmane.org/gmane.comp.video.ffmpeg.user}) see (@url{http://en.wikipedia.org/wiki/Thread_hijacking}) +@section ffmpeg does not adhere to the -maxrate setting, some frames are bigger than maxrate/fps + +Read the mpeg spec, read about video buffer verifer. + +@section I want CBR but no matter what i do frame sizes differ + +You do not understand what cbr is, please read the mpeg spec. +Read about video buffer verifer and constant bitrate. +The 1 sentence summary is that there is a buffer and the input rate is +constant, the output can vary as needed. + +@section How do i check if a stream is CBR? + +To quote the MPEG-2 spec: +"There is no way to tell that a bitstream is constant bitrate without +examining all of the vbv_delay values and making complicated computations." + @chapter Development |