Sound slowly goes out of sync

Have a movie that I have run through compressor 3 as both an .avi and as an .MP4. Then burn in DVDSP 4.2. The video and sound are in sync for the first half of the movie and then slowly goes out of sync. It gets worse as the movie goes on. Anyway to correct this?
Thank you.

The normal process would be to export a self-contained or reference movie from FCP, then use the resulting file in Compressor and choose the appropriate DVD preset based on the duration of your movie. Compressor will create the needed MPEG-2 (.m2v) video file and AC3 audio file for use in DVD Studio Pro.
MP4 is NOT a format used for DVDs and AVI is a Windows video container - neither are recommended for DVD Studio Pro.
-DH

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