I have a PC and a Mac G4. When I connect the ouput of my Canopus DVRex firewire to the input of the G4, it basically doesn't work, no video or sound in either direction. Either one works fine when connected to the video camera. I'm guessing that to output my video from PC to the Mac input, I need some kind of "bridge" hardware in between. Anyone no of such a thing, or some type of crossover cable or something?
I think it's a compatibility issue. My reccomendation would be to save yourself the heartache... output to a DV tape and then re-capture the video to the other computer. It's a 2 step process but at least you are using DV format so you know there will be no quality loss.