Hey, I just ran into this problem at work today. Apparently, my supervisor told me this happens often when they neglect to use a tape-head cleaner. So first off, always take good care of your equipment or you'll be spending wasted hours in the editing suite trying to sync up audio and video...AGGRAVATING!
Anyway, my problem was that we shot an hour long lecture w/ a 2 camera setup, with the wide shot handling the audio feed from the A/V booth. Since this camera hadn't been cleaned in a while, it had the 'red frame' anomaly take place around 33 minutes into the lecture. This caused me to have a lot of problems syncing up the wide shot and the close up's, obviously. So, after about 45 minutes of wondering what the hell went wrong, I found the frame and searched fruitlessly on the Adobe forums for about 30 minutes. I ended up just going in and cutting out the red frames (including the surrounding frames that are slightly pink/red.) Afterwards, I set the adjacent clip (the 2nd half of the clip that was produced from the cut) to a speed/duration of 100.5%. This seemed to solve things for the most part, but about 7 minutes later, the a/v sync fell off again. I had to zoom into 200% of the screen size to get a good look at their lips and determine the point at which the audio went out, make a cut at that point, and reset the speed value to 100%.
Note, I also had to export this into a self-contained video due to the fact that the audio was now about 18 seconds longer than the video track.
I am still up in the air as far as how this eventually turn out, but hopefully it gives you somewhere to start.
Mz
