I have two source videos. One was shot in standard definition and one was shot in HD. The standard def track is at the top, and the HD track is below it in the workspace. When I tried multicamera editing mode, I found that it messed up the sync between the two video clips and a separate audio track (that audio track is required, because the videos are of a radio station interview including some phone callers, and of course the camera mics did not pick up the phone call audio).

To get around that, when I want to switch from the top video track to the lower one, I'm just reducing the composite level on the top video track to zero, which lets the second video track display, and that works quite well.

The problem is that when the top track is active, I'm getting very thin lines on the left and right sides which display motion, and I'm guessing that this is because I've used a 16:9 pan/crop setting on the top track so that the black bars are consistent throughout the entire project. Apparently that top video is a hair narrower than the lower one, so some of that lower one is visible at the edges when the top track is active.

I've messed around with the compositing settings, but I can't seem to find the solution. Is there a way to prevent the lower track from being seen when the top track is active?

I suppose I could just swap the two video tracks around, but since I've already spent about 10 hours on this project, that might be my last resort. =)

Thanks!