How do I determine the audio delay(ms)?

[X-treme]

I'm trying to convert my dvd to xvid, and although the ac3 states that there is a 0 second delay, when merging the audio/video, the sync is off.

I have headac3che, and I am given the delay (ms) option, but first, how do I determine that the actual delay is?

I've never ran into this sort of problem before, therefore, I can see myself trying 1 ms at a time, but that would take FOREVER to convert, especially if the sync remains off.

Please help!

[Capmaster]

There's a tool called PVAStrumento. It's used for listing the PTS time stamp values in an MPEG file. It can also repair them theoretically, for correcting lip-sync issues, but I've never had any luck doing that. It does give you a very verbose accounting of the time values in the file, if desired, and you can select the level of detail you want.

[X-treme]

Thanks for the suggestion; however, it doesn't seem to be working. It constantly crashes through the 'scan' option.

I now have 3 movies that are out of sync, and all i need to find is a program to determine when to 'delay' the audio so it's in sync.

Any other thoughts?

[X-treme]

I just tried using Nandub to merge the original Ac3 audio file to the movie, and it is STILL out of sync. The AC3 states that it has a 73ms delay. I wonder if it was actually applied tho?

I'm so lost now

[IAIHMB]

You can use VirtualDub to determine the audio delay. Open the video in VirtualDub then:

-Audio -> Interleaving

Then go down to Audio Skew and fiddle with it until you've got a idea of where you want it.

[Capmaster]

I sympathize. I fought the sync battle for months 2 years ago. It's so difficult to fix after the fact, but so easy to avoid with a TBC.

I got to the point where I was demuxing the PS, taking the audio and converting to .WAV, using a special command line app to resample the audio with the desired delay, converting back to MP2 audio, remuxing, andn authoring. It never worked because my sync problem was not linear - the video clip would start out 10 mS out of sync and slowly drift more and more until at the 2 hour point it was 0.5 seconds off. The app I tried was hit or miss and I really had hope because you could resample the audio with any duration - stretch or compress. The problem was I needed to stretch it less at the beginning and more at the end. I never did get it right. That was when I bought my Timebase Corrector and the problem vanished.

Since I never did find a method that works, I can't suggest anything except "don't capture out of sync", but that doesn't help you. :P

[X-treme]

Thanks for the help thus far, but nothing has worked

The only thing I can think of is starting the audio at a further frame rate. Headac3he offers this option, hopefully something will come out of it.

Any other suggestions? :\