Monty Python and the Holy Grail audio out of sync

[rottweiler]

I have backed up about 30-40 DVDs, the first half were movie only,
but the last 15 or so have been full backups using the Trilight/Doom9 Full DVD Backup guides.
This is the first time I have run into this problem.
After reauthoring in Scenarist, the audio is out of sync(before video) by less than a second.

it's very small, but easily noticable.
I found one related post on this, but it was encoding into DivX and said to split the avi and adjust the audio in virtual dub.
I've used virtual dub a little, but don't know what to do with this.

Does anyone know why this might be happening, or a way to fix it?
Here's some information that maybe you can use:
NTSC 720x480
one PGC
2 VOB-IDs
28 chapters
105 cells (2-9 cells/ chapter)
5 audio streams
  English 2ch
  English 6ch
  French 2ch
  English commentary
  English commentary

The method for backing up is:
DoItFast4U(by PGC)
DoCCE4U
Scenarist(create tracks)
Scenchap
Scenarist(new from script, create DVD files)

I don't remember seeing a movie with so many cells before, might I have to extract by cell ID?
All I've heard is that you should never have to do it that way, I haven't seen an example that must be done by cell ID.
Should I try by VOB-ID or Cell-ID to see if that does anything?
Is there anything special about re-encoding, or putting it back together by Cell-ID?
Mainly could I still do chapters?

Is there any way to check the video/audio sync before reauthoring?
To possibly find which step is creating this error.

I will provide any other information if you ask.
and I'm not worried about time, if I need to try different ways.
Just thought I'd ask to see if anyone knew why this was happening.

Thanks,
Ted

[TRILIGHT]

This should be a direct copy. The Holy Grail disc I did was DVD-5. Is there more than one?

[rottweiler]

well, my DVDs VIDEO_TS folder is 5.16GB.

[TRILIGHT]

Well, that sucks. Sucks for you because you have more work to do and sucks for me that mine doesn't have as much stuff on it. hehe ;)

As for the delay, find AC3Delay and use it to add a slight delay to your audio so that it is in line with your video. If it's only slight but still noticeable, I would guess somewhere around 150ms should work. You'll just need to try it and see.

[rottweiler]

does the delay get taken from the name of the AC3 file.
or is there an option in Scenarist?

I'm guessing it's not the name of the file, since the older version of DoItFast4U didn't put the delay in the name.

Thanks,
Ted

[Eyes`Only]

Scenarist doesn't pay attention to the delay flag inside the ac3 when it imports it, so even tweaking it wouldn't do a thing. Daniel Ache came out with AC3 Delay Corrector for us, which actually 'pads' or 'cuts' the ac3 file to make it match up. Newer betas of DoItFast4U actually have this functionality built into them, because Daniel worked with me to help me get this working. Use AC3 Delay Corrector manually with you AC3 file, telling it the delay in the filename (that's why I leave it in there now).

[rottweiler]

thanks a lot,
although after working with this DVD I found that the audio is only off for 1-2min. in the 18th chapter.
It goes back to normal in chapter 19.

However I do have another DVD, Monty Python Live(what is it about Monty Python?), which has to be done by VOB-ID.
here's the ifo layout:
PGC 1 uses VOBs 7,8
PGC 2 uses VOBs 7
PGC 3 uses VOBs 5,6
PGC 4 uses VOBs 1,2,3,4

VOBs 7 and 8 are the two movies
5 is nothing, 1.01s

so on the menu you can select, play one movie, play the other movie, or play both.
after putting this back together the second movie has audio sync problems.
either playing by itself, or together.
I'm pretty sure it's through the whole thing, but am gonna redo it today to see.