[MEncoder-users] A/V synchronization problem using mencoder

[Oded Shimon]

On Tue, Mar 29, 2005 at 12:01:33PM +0200, Guillaume Poirier wrote:
> Hi,
> 
> 
> On Tue, 29 Mar 2005 05:37:18 +0200, Oded Shimon <ods15 at ods15.dyndns.org> wrote:
> > On Tue, Mar 29, 2005 at 11:08:21AM +0800, Xie Bo wrote:
> > > Hi,
> > >
> > >    I compiled the MPlayer-20050324 CVS in MinGW and run the following commond:
> > > --------
> > > mplayer dvd://
> > > --------
> > >    It is synchronized.
> > >
> > >    But when I execute the following command:
> > > ----------
> > > mencoder dvd:// -of mpeg -o output.mpg -oac copy -ovc copy -mpegopts format=dvd
> > > mplayer output.mpg
> > > ----------
> > 
> > Try adding to the mencoder command '-mc 0 -noskip'.
> > Might help.
> 
> Out of curiosity, why aren't those options on by default when using
> MEncoder? I can't find too many use cases when the user doesn't care
> about frames getting discarded, all the more when it leads to desync.
> Ok, that might be useful for real time conversion... Are there any
> others?

In most cases (when creating an AVI), adding thse options will CAUSE a desync, 
not prevent it. This is MEncoder's broken way of dealing with A/V sync in 
files. It's fundementaly wrong, but it works.

- ods15