[Matroska-users] Demuxing from Matroska, Remuxing to Other Format

Ivan Kowalenko ivan.kowalenko at gmail.com
Sat Jun 10 07:01:19 CEST 2006


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Hello.

I have several MKV files that I wish to transcode. However, I have an  
odd situation where the transcoder doesn't seem to like the MKV files  
as they are in source. If I remux them, either to another Matroska  
file, AVI file, etc., the transcoder has no problems. This probably  
has something to do with the way I archived the files or something  
like that.

My goal is to remux the files so that I can transcode them. Part of  
the problem is, though, whenever I remux the file (even using  
MKVMerge), I get busted keyframes and loss of audio sync. If I use  
MEncoder to remux the video to an AVI file (mencoder -ovc copy -oac  
copy), I get the same results. If I demux the video using MKVExtract,  
and remux the file with MEncoder, I don't get broken keyframes, but I  
do get out of sync audio.

Padding the audio doesn't seem to be the solution here, since the  
audio gets *progressively* out of sync, that is the further into the  
video you go, the more out of sync it gets.

I'm running a Mac OS X (10.4.6) system, and have no fear when it  
comes to monkeying around with the UNIX sub-system. Any recommendations?

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