You will edit your videos in a an offline, custom-sized sequence that includes your 12 nested sequences. This will be a tremendous PITA. It requires superbly careful planning and timing for the shooting and editing. when you’re done, you will recapture to high rez and render out each of the 12 clips individually. You may end up bouncing often between Motion and FCP or After Effects. It’s not difficult (most I’ve done is 3 screens) but it’s all about PreProoductionPlanning and PreVisualization. Lots of storyboards.
The final display will be controlled by a digital signage system. Be sure you do not get involved in that part of the action. While it sounds like it might be fun, it’s a bad place to be.
All you want to do is create 12 separate video clips and cleanly hand them off to the signage geeks.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”