Why do my mp4 videos playback off track from the audio?

it's been doing this for awhile now ever since i upgraded an itunes version, is there a buffer setting i can adjust? this is a good machine lots of memory, sata harddrives, etc. and on a whim i tried songbird (itunes knockoff) and they play fine!! I LIKE ITUNES but this is driving me nuts...
tia
rick

If you continue to get Video Audio out of sync, try this one:
Control panel
Sound (Hardware n Sound)
Under Playback tab, highlight each device and click Properties button
Go to Advanced tab and change Sample Rate to 16bit 48000hz (DVD Quality) or 96000hz (Studio Quality), OK n OK.

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Why do my mp4 videos playback off track from the audio?

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