Exported quicktime out of synch

My project looks and sounds fine in the canvas in FCP 5. I export it using "Quicktime Conversion" to MP4 and the resulting movie goes suddenly several seconds out of synch at a point about 3/4 of the way through the movie. It was fine up to that point.
The footage is HDV, and I'm exporting it at smaller dimensions, compressed as MP4 for the web.
Any ideas on where to go from here? Thanks for any suggestions.

You might try exporting it selfcontained with sequence settings first (and reimporting or playing in qtplayer to see if it's in synch). If it's in synch, use that to do your export.

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