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Any Tricks for Getting AV Sync Exact?

I've got a captured/edited/filtered video ready for it's final encode, but the sync seems juust slightly off somehow. It's not a framerate issue, because it doesn't get worse toward the end of the movie, rather the offset seems constant, so if I could figure out what delay (plus or minus) to use it'd be easy to fix. The trouble is I can't seem to get it just right. Does anyone know any good tricks for this? I thought maybe I'd load it into a subtitle authoring tool that shows both the video and wave-form, but I'd have to know exactly how the waveform should line up with the position of peoples lips on certain sounds. Anyone have any tips?

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