[MPlayer-dev-eng] making -mc the default in mencoder

[D Richard Felker III]

On Mon, May 17, 2004 at 04:22:30PM +0200, Nico Sabbi wrote:
> 
> >>Ivan Kalvachev
> >>
> >>p.s.
> >>If I understand correct "mc" is used to smooth dropping/dublicating.
> >>It's maximum value is maximum frame duration.
> >>   
> >>
> >
> >mencoder uses a bad feedback system to measure A-V drift, because the
> >demuxers suck too bad to give correct pts which could be used
> >directly. The -mc option specifies how much the measured "A-V" value
> >is allowed to change each frame. Using high values for -mc means trust
> >the demuxer's pts, whereas low values will cause correction to take
> >place only when there is prolonged desync in the source. But skips &
> >duplicates for adjusting framerate (including inverse telecine) will
> >always take place immediately, regardless of -mc, unless -noskip is
> >also used.
> >
> >Rich
> >
> >
> >
> > 
> >
> 
> is it better to use -mc 0 or -mc some_large_value when the demuxer gives 
> correct
> PTS that wrap around (mpeg  ps/ts ) ?

If mc!=0 worked, it would be better to use large value for mc. But
since it _doesn't_ work (broken preload/buffering measurement), mc!=0
will always give wrong results (at least slightly). mc==0 will work
exactly if the source material is ok (even if it has resetting
timestamps), but not if it has "missing" segments of audio (supposedly
common for dvb).

Rich