MPEG-4 video file playback issue

I have ripped a couple of DVDs into MPEG 4 to watch on my Macbook. The first time I accessed one I put the headphones on but it was unwatchable - the picture and sound were out of sync. A while later I decide to poke around this issue and found that the movie played just fine until I put the headphones in ! I then had to cancel playback remove headphones then re-start the movie. Any-one got an idea on what's happening? Thanks.
eMac 1GHz PowerPC G4 MacBook2GHzIntel Core Duo 512MB DDR2 SDRAM   Mac OS X (10.4.6)  

That has happend to me, I just hit pause wait sec. them push play. Try it, it worked for me.

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