Sound out of sync with picture

I have been recording from VHS to digital and although the sound and picture are in sync on the video they are slightly out when I play them back with Quicktime.
Does anyone know what maybe causing this or do you know if you can move the sound file in Imovie so that it is back in sync.
Thanks

Audio is often recorded as 32 KHz (12 bit) or 48 KHz (16 bit).
As Roy says, your Easy Setup must match.
Exactly how are you converting VHS and to what type of "digital"?

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