[MEncoder-users] MPEG-2 muxer

[Phil Ehrens]

Nico Sabbi wrote:
> Nicolas Hesler wrote:
> 
> >Nico Sabbi wrote:
> >  
> >
> >>Nicolas Hesler wrote:
> >>
> >>>Can you recommend a method by which you could use Mencoder as the 
> >>>encoder, retain sync as much as possible and end up with 2 files (m2v 
> >>>and ac3)? 
> >>>
> >>>Thanks for this.
> >>>
> >>>
> >>getting the audio and video files is as easy as running
> >>mencoder -of rawaudio  and mencoder -of rawvideo
> >>on the final mpeg file, but your question shows that
> >>you didn't understand the problem: whenever you demultiplex
> >>the mpeg file you are likely to introduce desynchrony
> >>
> >Is this desynchrony due poor muxing/encoding on the part of the original 
> >encoder?
> >  
> sometimes mencoder doesn't do a good job, especially -o[av]c copy,
> but in this case it's simply due to the absence of timestamps in the audio
> and video files (only the muxed file has timestamps)

Mencoder seems to handle switching from and between progressive
and interlaced content pretty well. The cases where I have seen
-o[av]c copy fall down were with .mkv files with strange made-up
framerates in some parts.