Hi guys

For a visual presentation during a concert i need to create a split-screen of 2 video-camera's.

These camera's have coax output.
So, my question is, what is the best way to "dock" these camera's simultaneous to my macbook pro and what is the best software to create this splitscreen?

The output is not a problem, i have a DVI to vGA adapter, and a DVI to composite. So i can go to the projector without a problem.

I just can't figure out how to input these 2 camera's and create one single splitscreen signal.

Tnx for all your help !