Why does my video skip on playback/preview during editing?

I thought I knew how to edit video...... I had a family reunion this summer and I'm trying to take all of that video (captured on my Samsung SC-HMX10C HD video camera) and edit for an eventual DVD output. I've got it all imported in Imovie, but when I add music (from I tunes),trim the video or add transitions then press playback it is all skippy. It plays for a few seconds correctly, then the video freezes (but I can sometimes still hear audio) and then suddenly reappears 5 or seconds down the clip.... then keeps happening. OVER & OVER & OVER....HELP! I have about 3 hours of video to do and it has taken about an hour for about 1 minute of clip because it keeps freezing up. Sorry if this has been asked before, but I've been reading these discussions all day and didn't find this exact question. By the way the video clips are MP4's. Thank you!

You would get better results if you convert the MP4 ciips into Apple Intermediate Codec before editing. After editing you can render them back into MP4 if you want.
MPEG Streamclip (free) will do this conversion. Or get iMovie 09 and it will do it.

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