[MEncoder-users] Any recent changes that could affect MPEG 2 muxing?

[Reimar Döffinger]

On Wed, Mar 23, 2011 at 12:58:24AM -0500, L. Lee wrote:
> If I execute a mux command to adjust A/V sync in an MPEG 2 stream such as
> mencoder [inputfile.mpg] -ovc copy -oac copy -ofps 24000/1001 -of mpeg
> -mpegopts format=dvd:tsaf:adelay=-200:muxrate=40000 -o [outputfile.mpg]
> using MEncoder svn r32924 (as well as quite a few previous versions),
> everything works well.
> 
> If, however, I execute that command using r33094, the audio tempo appears to
> be increased greatly, demolishing sync, and the command progress output
> includes many duplicate frame notifications. The visual output remains
> unaffected.
> 
> Has something changed that can be accommodated by adjusting any of the above
> command options? The source video is 24 fps with 6-channel audio (AC3).
> Thanks.

Mencoder A/V sync code was changed, though I think it should not affect
the copy case.
However I think you should always use -mc 0 -noskip if you copy both
audio and video, and using -ofps probably is a bad idea as well.