For audio-out-of-sync problems, try to add
-audio-preload 0.8 -delay 0.1
to Extra parameters -> mencoder
You can change the delay value to anything you like (positive or negative) to fix the synchronization issues. The value is in seconds.
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Edit:
ooops... I was reading older posts from this topic without noticing, and replied to them...
Btw, the latest viDrop can be downloaded now from
http://www.vidrop.vpunk.co.uk/vidrop-0.57.1-install.msi too.
Thanks to makd511.