[MEncoder-users] Problem re-encoding matroska xvid+ac3 file

[Maciej J. Woloszyk]

Hi,
I've been using mencoder for quite some time without any significant problems. 
However lately I've been downloading some anime files some of which are 
contained in matroska files. As my standalone DVD player does not support 
matroska I need to re-encode it to standard avi (hardcoding subs). Problem is 
the input files seems to be vop packed xvid's with ac3 audio and mencoder 
can't reencode them properly - I get some horrible A/V desync whatever I try. 
And when I try to use just stream copy to transfer both audio and video 
streams into avi container using:
mencoder -oac copy -ovc copy -o output.avi input.mkv
It starts fine and after some 5000 frames I get the message "Too many audio 
packets in the buffer" and it stops and effecting 3 minutes of the output 
file is broken - it has A/V desync and some compression artifacts.

Is there any way to make it re-encode correctly? I don't understend why 
mplayer can play the input file perfectly fine and mencoder can't re-encode 
it. Is there some difference in code used by mplayer and mencoder? Shouldn't 
both programs use the same mechanisms?

Thanks in advance for any help,

M.
PS. I've been trying to solve this problem for a few days so I already tried 
simple soultions I could think about - none of them worked. Even using 
Windows VirtualDub solves problem only partially - 5 of 12 files can then be 
re-encoded correctly.
-- 
Maciej J. Woloszyk, <mat at esi.com.pl>
tel. +48 501 033 410          "All power corrupts, absolute power...
JID:mat at esi.com.pl                               ...is even more fun"