Big Problem with FFMPEG?

We’ve run into a problem on XTIN Project where the soundtrack, scored to a .mov converted from an .avi made from Blender, no longer lines up when rendered out to ffmpeg. I’ve checked the .avi - .mov conversion process.

We’re losing 2 frames which doesn’t begin to account for the misalignment of the audio track in the final .dvd final.

But, lookee here - a 1025 frame sequence, when rendered to ffmpeg, is reduced to 963 frames? I don’t know that this is our problem, but it looks suspicious.

Any thoughts on this?