I'm trying to burn what used to be an .avi file and now .IFO and .BUP files using Nero Express (burning image to a dvd). However, there seems to be an audio sync issue with a couple of my files, and the only option I have to adjust the audio is an audio delay option for IFOEDIT. The problem is not that the audio is ahead of video, it's the video going from 2 to 4 seconds ahead of audio (and needles to say, audio delay would only worsen the situation). It's 2 seconds for one file and 4 seconds for some others. Is there a program that allows me to speed up the audio to catch up with the video? Thanks.