[MEncoder-users] mencoder problems in going from vob to avi

[James Hastings-Trew]

Reimar Döffinger wrote:
> On Sun, Jun 06, 2010 at 08:35:37PM -0700, Mike Castle wrote:
>   
>> Recent version of mkvmerge started having with AVI files that mencoder
>> produces.  The mkvmerge folks did some analysis and have come to the
>> conclusion that the AVI file is malformed.
>>     
>
> Not really, MPlayer just tries to keep sync the best it can with copy,
> so it ends up dropping _encoded_ frames, which is going to work really
> badly. Are you actually sure the desync issue you noticed didn't
> exist with the AVI file? Because I am almost certain that the new
> mkvmerge behaviour is actually the correct one.
> Either way you lost quality due to dropped frames already before.
> The solution is to use -noskip (and probably also -mc 0) when using
> -ovc copy with compressed data.
> Suggestions on how to document this better are welcome (or maybe we should
> make -noskip default for -copy, not sure).

I think the expected behavior of -copy is to, you know, COPY the stream, 
unaltered.