Remeber to scan for bad frames as some one already said.
If the whole movie is out of sync. this may work.
decode a small part of the movie the best bit, is a close up of single person talking.

Watch the lips and time the sound to the motion.

On MIB2 there was 2000 audio error.
Just try different amouts -2000 or 2000 and decode again. See if the lips sync has gone better or worse.

Find right error amount and decode movie.

Cheers SMID