[Martin Jefferson]

Is your footage 30 fps natively or was it shot at 23.98 and had pulldown added? If it is the latter, then perform an inverse telecine (I use Apple Compressor or Telestream Episode) to get it back to 23.98. 23.98-25 is a lot easier than 30-25. There is an audio program called Time Factory that does a brilliant job with large audio changes, but 30-25 is a 20% speed difference, and however you do it, it’s going to be noticeable.