I have 2 "high-quality" AVIs which are DVD rips and I'm very frustrated that upon Divx Doctoring (so I can make SVCDs) to discover the sound synch is very off.

In one file, the audio/video on the AVI appears to be just fine but the AVI of the other one is off-synch off the bat. It's such a pain to drop into FCX or some other video editing to do a sound-matching. I don't think that's quite the most efficient way.

Is there a proper (painless) procedural to fix this? I vaguely recall somewhere that fixing this is better on a PC (!) Thanks.