[MPlayer-users] Audio/video sync... again

[Fabio Papa]

On Monday 10 November 2003 05:20, D Richard Felker III wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> On Mon, Nov 10, 2003 at 04:57:20AM +0100, Vidar Wahlberg wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> >
> > > > Is it only me who's stuck with this problem?
> > >
> > > Try with -oac copy or -lameopts cbr and see if the problem goes away
> > > with either or both of these. Using cbr is NOT a good idea, but this
> > > will tell whether the problem is the elusive 'lame bug' or not. If
> > > this fixes the problem, I would recommend downgrading to lame 3.90 or
> > > earlier, which definitely does not have such a bug.
> >
> > Thanks for a quick answer.
> >
> > Didn't want to write too much info in case I'm the only one having this
> > problem, but I see that I could've provided more info:
> >
> > I've made a script that encodes the video to XviD and simply copies
> > the audio (-oac copy). This is done in a 2-pass mode.
> > Further I dump the sound with mplayer from the newly made XviD file and
> > encode this wave file with oggenc before merging the ogg and the XviD to
> > a new ogm file.
> > When this is done I'm stuck with the original vob (audio is in sync), a
> > encoded movie.avi where the sound is copied and a movie.ogm. So I'm not
> > even using lame in the process. However, in both movie.avi & movie.ogm
> > the audio seems to have the exact same desync, which is as previously
> > mentioned about -200ms to -350ms. Funny thing is that I tried with a old
> > Star Trek DVD and there the audio almost was in sync, but that's just
> > one DVD out of 6.
> >
> > So it boils down to:
> > Encode from vob with -oac copy
> > Encode from DVD with -oac copy
> > Encode from vob with -nosound, then get sound from vob with mplayer,
Sorry to post only a partial quote, but I wasn't able to find the original 
post...
I don't know if this can be related, but I noticed that when encoding dvds I 
always get two or three dropped frames in the very beginning. Usually this 
doesn't leads to huge problems, but if the frames dropped are more you could 
notice it. I always treat the audio separately with audacity, in order to 
amplify it, so it's easy to compensate that cropping out the first .15 sec of 
audio.
Usually, as you try to start from different points than the beginning, the 
number of drops increases hugely, so the audio is much more out of sync.
I am still interested if someone can give an explanation of this.



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-- 
Fabio Papa
Engineering division
Machining Centers Manufacturing S.p.A.
viale F. e G. Celaschi 19 - Vigolzone (PC) Italy