Out of sync sound  when import mpeg4

I've import mpeg4 file from my Flipcam. I just wanted to make tigher ins and outs. But when I pull it into to timeline - the sound is out of sync. Any ideas why?
Thanks in advance.

MPEG 4 is not an editing format.
Convert your video to one of the codecs found in Final Cut Pro"s Easy Setup menu.
Does this camera shoot HD or SD?

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