Blade movie - AC3 soundtrack desynch

[glenn]

I'm having a problem with synching with the movie Blade (r2). For the record, I've done hundreds of rips with little or no problems, and it is only now that I've tried my hand at ac3 that something like this arose.

Anyway, after demuxing the desired ac3 track (with dvd2avi), the video stream is encoded with xvid. Muxing to OGM is done with VirtualDubMod, latest, by first opening the video file and then adding the ac3 file (OGM - Show inputs - add), and finally saving the finished OGM. The filename for the ac3 show NO delay value. Still I'm getting a desynched final video... Any help in troubleshooting this problem would be most appreciated!

I did some test encodes previously, with AC3, on some trailers, and they worked flawlessly with this method, so...

[DJ Bobo]

It doesn't have to be ogm, AVI is perfectly fine.

Anyway, your problem is related to interleaving and preload. Set both to 96ms and all will be fine.

[glenn]

You were right about me not setting the interleave and preload values, but... the problem remains. I prefer OGM as a container format, but for the sake of argument I tried with both OGM and AVI, and the audio is still slightly desynched. Any ideas? Could the delay value (0) given by dvd2avi be wrong?

[DJ Bobo]

May be your computer isn't strong enough to handle the resolution you choosed.

You can use BSPlayer to see if you computer is keeping up with the video.
Just open your AVI there, play it, right click on the video window and choose "video details".
After a few seconds you'll see an fps display. If it is inferior to the actual fps number of your AVI, your PC isn't strong enough to handle it.
So the solution would be to lower the post processing level of DivX, or to rerip again with a lower resolution.

[glenn]

My setup is more than up to the task, an AMD Athlon XP 1800+ running on a mainboard with 333mhz ddr-ram should handle pretty much any clip flawlessly. For the record, it replays movies with ac3 soundtracks from other sources perfectly, so the problem is not with the hardware - it's probably with me ;) I guess I'm doing something or other wrong....

[glenn]

I'm leaning more and more in the direction that this is a problem with this particular dvd, since I have been conducting experiments with a few other full movies since, and have not had any problems achieving perfect synch with ac3. I'd love it if anyone else could verify this though; The Blade dvd I tested was a region 2 release, specific to scandinavia (subtitles in norwegian, swedish, danish and finnish only). At least now I know I wasn't doing anything 'wrong', it seems.

Thanks to Dj Bobo for trying to help out.