Hi, I'm looking to give a "how to do TV weather" workshop here in the L.A. area (I was a weatherman for ten years). I need to have a live key show up on three monitors, and have it be keyed with graphics from Keynote (on a mac) and then record down the final product somehow. Is this something that can be done? Thank you in advance.
Look into the TriCaster by Newtek. Inexpensive SD models to high end HD. Key from any live source (HD or SD) with the ability to replace with any other live source, stills, gfx, pre-recorded (DDR), etc.