you should never try messing around with the frame rate as the audio goes out of synch.
if you had backed up the video then good, but if you didnt then try this method but it is a hit and trial method and is time consuming -
Credits : Tadad
If you find your sound is out of sync on your AMV conversions you can adjust that in VirtualDub as well. Press CTRL+I to bring up the Audio Interleaving settings and set Audio Scew Correction to + settings if your audio is early or - settings if your audio is late. (eg. +300 or -300) Settings are in milliseconds and you will have to experiment to find the right settings for you.
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