This is a known problem with
DVD Fab Platinum and imo a very serious drawback to this application.
It is not just dependant on the particular movie you are converting, but rather the conversion process itslf.
Ok, some specific movies will convert ok, but this seems like attaching sellotape to try to fix a major problem in this application.
I paid for Platimum edition just so that i culd convert a piece of movie
DVD to AVI, and the result had a terrible timelag.
After much investigation, including emailing the author of DVDFab, i was told they are working on it.......
Still not fixed.
I gave up, and used an Application which realy works.... and is free....
DVDx
Don't waste your time trying to get DVD Fab to work until a fix is released to fix this audio time lag problem when converting formats.
Dave