Extracted audio from DVD out of sync after certain chapter

[chipzoller]

I'm not sure if this is an appropriate place for this but it seemed like the closest.
I'm having a problem when I'm trying to backup an opera of mine on my iPod (Wagner's Die Walküre) where the audio extracted from the main movie goes out of sync at the place where the 16th chapter is. I've used 2 different decrypters and encoded the audio a couple different ways with the muxed file resulting in the same: perfectly synchronous audio up until the point where the 16th chapter is on the DVD. If I even play the VOB file that corresponds to that position on its own it even displays the same behavior. Could this be a mastering error? Any ideas how I'd go about fixing this?

[setarip_old]

Hi!

If you play the original DVD on your PC AS A DVD (not just selecting the individual .VOB), does it go out of synch?

[chipzoller]

No, somehow it is in sync just fine.

[setarip_old]

Sounds like the problem lies in the ripping.

I'd suggest you re-rip the original DVD, using good ol' DVDDecrypter v.3.5.4 (Because I doubt that there's any newer or "special" copy protection on this DVD title) - as ONE file...

[chipzoller]

Re-ripped it twice as well as with latest DVDFab...all same results.

[setarip_old]

Did you specifically, as I suggested, re-rip using DVD Decrypter (different than DVDFab Decrypter) as ONE file/VOB?

[chipzoller]

Did you specifically, as I suggested, re-rip using DVD Decrypter (different than DVDFab Decrypter) as ONE file/VOB?
Indeed I did. Same result.

[setarip_old]

Based on all you've done, I'd speculate that there is a minor glitch on your original DVD, that players (both hardware and software) are able to deal with but, rippers, with their exacting requirements, are replicating the flaw, which then fouls up your (I presume) compression/conversion for Ipod use.

When you say "same result", are you referring to the compressed/converted to Ipod version or (as I understand you) the initial DVD Decrypter rip?

[chipzoller]

When I say "same result" I am referring to actually the only result: out of sync audio around the moment where, on the DVD itself, the 16th chapter would fall, and from then on out asynchronous audio by that same amount to the end. I suspect it is audio as all 3 streams are in perfect sync (video, audio, and english subs I'm burning in) until this point, and thereafter only the video and subs are in sync. I've never seen this before but suspect it's some sort of mastering issue on the DVD itself. I wonder if that being the case this is the best forum? It'd be nice to hear what some of the DVD gurus out there say. Thanks.

[setarip_old]

When I say "same result" I am referring to actually the only result: out of sync audio around the moment where, on the DVD itself, the 16th chapter would fall, and from then on out asynchronous audio by that same amount to the end.I'm sorry, what you say is unclear to me (Please understand that I am not an Ipod owner) - Have you only ripped the DVD as one .VOB, or have you then additionally had to convert or compress that file to make it usable for your Ipod?



BTW -
I said:I'd speculate that there is a minor glitch on your original DVDYou said:suspect it's some sort of mastering issue on the DVD itselfWe're saying the same thing ;>}

You might want to return the DVD to the place of purchase in exchange for a new replacement. I had a similar problem a couple of years back with "Capote" (subsequently acknowledged to have "mastering problems") and, on the third attempt obtained a viable DVD.

[chipzoller]

For this iPod "process" I am converting to 320x240 H.264 with baseline profile in MP4 container with AAC audio. The video portion is fine; quite simple with no problems. When both streams are muxed together the sync problem is apparent.

We're saying the same thing ;>}
Yes, we are :) However the term "glitch" is somewhat ambiguous. I suggested a more specific diagnosis that whenever the DVD was authored, something was done incorrectly however since I lack specific knowledge of the spec. I can only speculate as to the cause. Regardless, it's safe to say that there is a problem which, in my thousands of encodes for many playback situations, is out of my hands in this case :)

You might want to return the DVD to the place of purchase in exchange for a new replacement.
This may not be possible as I purchased this quite some time ago online. Since the DVD plays fine both on a hardware and software, I'm not sure I'm ready to try that yet. I think there may yet be options unexplored, and I'm simply trying to coax them out of the members here.

I suppose I could try ripping up chs. 1-15, encoding them with audio, then chs. 16-end and adjust the audio delay at the very beginning. Or a dirtier and less precise method (as a last resort) by editing the audio in an editor and inserting silence (since ch. 16 is the beginning of the second act, before which is a somewhat extended silence) where appropriate.

[setarip_old]

For this iPod "process" I am converting to 320x240 H.264 with baseline profile in MP4 container with AAC audio. The video portion is fine; quite simple with no problems. When both streams are muxed together the sync problem is apparent.(I'm trying, by a process of elimination, to determine at what point of what procedure the asynchronous situation first rears its ugly head)

1) If you play the DVD Decrypter ripped file/.VOB from your hard drive, does it go out of synch?

2) What software and procedures did you use to DE-mux the DVD Decrypter-created file/.VOB?

3) Are the DE-muxed videostream and audiostream of the same duration?

4) Does the program you're using to create the 320x240 H.264 with baseline profile in MP4 container with AAC audio REQUIRE De-muxed streams for input, or can you simply input the .VOB?

[chipzoller]

1.) Yes, around the 16th chapter, roughly the 5th VOB file.
2.) DGIndex 1.5.0 Final
3.) Yes
4.) Using MeGUI. It may not require demuxed streams, but it will use DGIndex to demux the VOB anyway.