You can find the reqs on Orb's website... I think,
www.myorb.com. google "orb video" and you'll find it. The system needs to have a decent amount of processing power, because it's transcoding on-the-fly. So an older 'stored in the closet' system likely isn't going to cut it.
I've had good luck with music, but video is more of a challenge to get a decent framerate. Anyone has configuration / buffering tips, I'm interested.
Your mileage may vary.