I've got an upcoming performance for which I plan to use multiple cameras (3 or 4), which I'd like to be able mix, crossfade, etc. I've also decided that it would probably be easier for me to composite and mix these sources down to one video stream coming into the computer, rather than have jitter looking at multiple devices and mixing in the computer (especially as I don't have multiple video cards). I'm also going to be maxing out my cpu cycles on processing a single stream anyway, so it seems to make sense to take this approach.
I'm on ye olde mac (pre intel) platform, os x.
Can anyone recommend a solid piece of gear that is