If using mac that would pretty much leave media player, I think you can stream from a mac using it. I know mac's can read media player, not for sure on the transmit of your webcam using it though. Emulive won't work at all on mac's so that isn't a option. I believe those are your only two options.

Get a cheap pc for the webcam and stream it from that, use your mac for your other stuff. The webcam can be resource heavy anyway, you may not want it on your main computer anyway. Good luck!