DVD with weird PGC structure

[lordretsudo]

I have a DVD on which the main movie is all in one title set, but is split (arbitrarily it seems) into several PGCs, as follows:

PGC1 - 20:05
PGC2 - 05:02
PGC3 - 53:02
PGC4 - 07:46
PGC5 - 03:22 (trailer)

Within PGCDemux, I can select to demux by VOB ID and this then gives me the full movie. However, when I go into VOB Blanker, I can only replace by PGC, not VOB ID. Is there any way to replace by VOB ID? I tried doing it for each PGC and I ended up with audio out of sync in the third and fourth PGCs.

I am adding subtitles FWIW. I've worked on many DVDs but have never come across this problem before.

[manono]

Is there any way to replace by VOB ID?

No, and I also consider that a drawback as I've wanted to replace VOB IDs before.

I tried doing it for each PGC and I ended up with audio out of sync in the third and fourth PGCs.

Should be pretty easy to fix. They're off by the same amount all the way through, aren't they? Did you check for a delay when demuxing?

[lordretsudo]

Should be pretty easy to fix. They're off by the same amount all the way through, aren't they? Did you check for a delay when demuxing?

Bizarrely, apart from the first PGC, PGCDemux shows the other PGCs as not having an audio stream. But, when I demuxed them, the audio was there. Is there any other way to check for an audio delay?

Thanks for the reply

[manono]

Audioless PGCs are often indicative of an incomplete decrypt. There is an/are unreferenced and audioless cell(s) before you get to the main video. With the complete DVD already on the hard drive I think I'd run the VOBs through FixVTS to try and remove those cells, and if it works your PGCs should now show some audio.

Even so, it's easy enough to find out the delay after the fact, remove it from the audio using DelayCut, and then reauthor the PGCs using Muxman or whatever your authoring program is before doing the final replace step in VobBlanker.