[FFmpeg-devel] [PATCH] Matroska Muxer

Michael Niedermayer michaelni
Wed Sep 5 19:52:14 CEST 2007


On Wed, Sep 05, 2007 at 07:37:18PM +0200, Reimar D?ffinger wrote:
> Hello,
> On Wed, Sep 05, 2007 at 01:13:30PM -0400, Alexander Strange wrote:
> > On Sep 5, 2007, at 9:33 AM, Reimar D?ffinger wrote:
> > > On Wed, Sep 05, 2007 at 03:15:06AM -0400, David Conrad wrote:
> > > [...]
> > >> As for using it, pretty much any valid command line that starts with
> > >> ffmpeg and ends with .mkv should work, e.g. "ffmpeg -i blah.ogg -
> > >> vcodec mpeg2video -acodec ac3 blah.mkv" It can also be used from
> > >> mencoder, e.g. "mencoder blah2.avi -ovc lavc -oac faac -of lavf -o
> > >> blah2.mkv" but it's possible to produce invalid files that way.
> > >
> > > Could you give details how and under which circumstances this produces
> > > invalid files?
> > 
> > It creates native-order H264/MPEG4 streams for -ovc x264 and -ovc  
> > xvid, but stores avi-style streams.
> Well, I somehow feel this is a bit of a design problem with mkv,
> requiring special handling for each supported format (though at least
> the handling is much more sane than ogm and possibly more sane (but less
> consistent) than for AVI).
> I'm not sure there is a really good fix (beyond special cases for the
> most common codecs), since mencoder is supposed to
> handle e.g. binary codecs nobody ever heard of and are not in SVN - so
> for these cases avi-style seems to be the only option.
> > There's no extradata and all frames have increasing pts even if b- 
> > frames are on. (like the big warning says, I guess)
> That's exactly why I asked, because the warning is gone since quite some
> time I thought...

vglobal=1:aglobal=1 are needed to get the proper extradata
this should be automated yes and a patch is welcome (the muxer say through
a flag if it needs global stuff and that should be passed to te encoder
somehow ...

and the monotone PTS are odd, it was working properly when i disabled the
warning though that was with mpeg4 encoding IIRC

can someone check where the pts go wrong?

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If a bugfix only changes things apparently unrelated to the bug with no
further explanation, that is a good sign that the bugfix is wrong.
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