The main problem I have had converting old SVHS and VHS tapes to digital format was a loss of sync between video and audio. The only way I could fix this was to use a capture device which had some type of time base corrector (TBC). I ended up buying a canopus ADVC-300 which has a linear TBC and some other options to tweak the video before digital conversion.
This is a costly device so is only an option if you have a lot of work for it do. Any device with a TBC should fix sync problems.
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