[Matroska-devel] MatroskaSplitter Vorbis Bug/Demo

Liisachan Liisachan at faireal.net
Thu Aug 5 04:50:29 CEST 2004

If MKV has an Ogg Vorbis track,
Video rendering rate is not constant on Windows,
but irregular, altho the global FPS is correct.

The difference (irregularity) can be easily
observed in this demo:


Same video and same audio (in Vorbis or in MP3)

OK ->      20040805 xvid+mp3.mkv
OK ->      20040805 xvid+mp3.ogm
No Good -> 20040805 xvid+vorbis.mkv
OK ->      20040805 xvid+vorbis.ogm

Probably this is a problem of splitter,
because the same thing happen when muxed with MMG,
and when muxed with VDM too.

I tried older Splitters, but the problem is not fixed.

This happens when the audio is Vorbis.
If the audio is in MP3, the same video in MKV plays fine.

(Rough Concept)

This is what you want to see:


(+) means the next (new) frame.
7 frames in this unit.

However, what you actually see is something like this:


7 frames in the unit anyway, so global fps is correct,
but the rendering timing is not constant...



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