Re: [dvd::rip] dvd::rip audio out of sync by ~200ms?

On Mon, 21 Jan 2002 Charlie000@xxxxxxx wrote:

> I seem to be having the same problems with a very small but consistant delay 
> between the video and the audio lagging behind. The .vob's that get ripped 
> played just fine with out any delay. But when I transcode using dvd::rip the 
> resulting avi's have the problem.
>
> Interesting enough Xine does a fairly good job at droping frames and the lag 
> is almost not noticable but aviplay there is a definite delay.
>
> I've tried different cropings and clippings and with different transcoding 
> options and all getting the same result. I'm using the divx4 codec and was 
> suspicious that might be the problem.
>
> I can use divxripper which seems to use the divx3 codec on the .vob's that 
> where ripped with dvd::rip and there is no delay but the video quality is not 
> near as good as the transcoded avi's using dvd::rip with divx4.
>
> Anything that you can suggest I do to get the same video quality but with out 
> the delay using dvd::rip would be great.
>
> Thanks,
>
> Charlie
>
> > I have been having problems with most movies that I ripped
>
> > with DVD::rip that the audio is out of sync by ~200ms.
>
> > The movies I ripped are all NTSC 24fps format.   The sync
>
> > doesn't change throughout the movie so at least if I ajust
>
> > it in mplayer it will be ok.   Now I tried to play around with
>
> > avisync but to get a 200ms delay I should in theory be inserting
>
> > a few frames of audio, but I find myself inserting much much more
>
> > than that to get it in sync, sometimes 24 frames to get the
>
> > equivalent of 200ms delay.
>
> >
> > Now I'm trying to chase down where this delay could be coming from,
>
> > I'm not sure if it's transcode or libdvdread.    I know that the AC3
>
> > contains some sort of "delay" info that normally the player (or
>
> > encoder) should follow to make sure the audio is in sync, so maybe we need
>
> to
>
> > extract that value and apply it before starting the rip?
>
> >
> > Could I re-ajust the sync by using transcode by doing a direct copy
>
> > of video and audio and specyfing an audio delay (instead of using what
>
> seems> to be the buggy avisync program)?

Hi,
this seems to be a problem with transcode. PAL DVDs are 95% fine, so
I guess tcdemux strategy works. I actually do only have a single NTSC DVD
image for testing.

Could someone send me a link to download a few MB of the first VOB chunk
extracted with "tccat -P/-T", where I could fix the problem.

avisync will be phased out soon. I will try to use transcode's
pass-through functionality and "-D" to fix a possible constant AV delay.

Regards,
Thomas.


>
> >
> > -Christian
>
> >
>
>
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-------------------------------------------------------
Dr. Thomas Östreich
Institute for Theoretical Physics
University of Göttingen
fone: +49 (0)551 397684 | fax: +49 (0)551 399263
e-mail: ostreich@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-------------------------------------------------------