I had audio sync issues with few DVD encodings and I reported that here few days back. I thought it was only with international DVDs but I found out from Handbrake forums that it can happen with any DVDs with "zero cells" in it. If DVD source has 'zero cell' in it, after that encode will loose audio sync to video by few seconds. One of the reported DVDs is "Casion Royale" with audio sync issue. Just wanted to share in case you are doing mass encoding on your DVD collection.