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

Subject: [dvd::rip] dvd::rip audio out of sync by ~200ms?
From: Christian Lambert <clambert@xxxxxxxxxxx>
Date: Fri, 18 Jan 2002 12:32:52 -0800 (PST)
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)?

-Christian


 

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