Instead of mucking around with multiple video cards, hacking mplayer, or rolling your own system that can control multiple genlockable video cards (i assume you'll need this, using a 3d display) I would recommend going with a dedicated solution such as newtek's video toaster. (Disclaimer - I am in no way affiliated to newtek.)
VT gives you 4 composite / component outputs, and is capable of handling multiple streams at once. Simply amazing for real-time compositing. (Disclaimer #2: I've never worked for a large digital house either, so what I'm impressed by might be run-of-the-mill in the industry. *shrug*)
I would suggest that this would save you a lot of time / effort, but that it might give you a slightly over-engineered solution.
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Instead of mucking around with multiple video cards, hacking mplayer, or rolling your own system that can control multiple genlockable video cards (i assume you'll need this, using a 3d display) I would recommend going with a dedicated solution such as newtek's video toaster. (Disclaimer - I am in no way affiliated to newtek.)
VT gives you 4 composite / component outputs, and is capable of handling multiple streams at once. Simply amazing for real-time compositing. (Disclaimer #2: I've never worked for a large digital house either, so what I'm impressed by might be run-of-the-mill in the industry. *shrug*)
I would suggest that this would save you a lot of time / effort, but that it might give you a slightly over-engineered solution.