I've done quite a few BD to main movie mp4 conversions as well as a few multi-episode TV series on BD to mp4 and they have had no noticeable audio sync issues. However, I just did season 12 of NCIS and all the episodes I've watched so far have a noticeable lag between the video and the sound. It's enough to make watching conversations quite annoying. I'm using the iPhone 6 plus or 6s plus profiles with Surround 5.1 at 128 or 384 kbps. Both settings have the same audio sync problem. I'm using CloneBD 220.127.116.11 and AnyDVD HD 18.104.22.168. Any suggestions for fixing this? THanks. My reasons for selecting this output format is so everything plays on my Apple TV's.