Video audio out of sync in imovie

I have been trying to record video directly in imovie '11 using my webcam in my macbook pro 10.6.8 but the audio/video gets really out of sync
I have tried to detach the video and I have tried optimizing it but neither has worked...the video was only 4 min long
the video is 720p and the frame rate is 30
what am I doing wrong?

Can you see breaks in the audio waveform? See image:

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