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Just shot a video using imovie '11 and built in camera and microphone.  Everything done on the computer.  Audio and video is totally out of sync.  I detached video and was able to sync the beginning but as the clip goes on it gets out of sync again.  How to solve that?  I've read other inputs and it was suggested that I make sure audio is 16 bit.  How do I do that? But, more importantly, how do I correct the sync issue for the whole clip?  Could really use some detailed help.  FYI, I have a mac book OSX 10.7.4  Thanks