I just sat down and watched some 1080p content off my Dual 2.3ghz G5 with no frame drops straight out of iTunes to my Apple TV 3
It didn't even use any real CPU resources. Yes it's possible to stream 1080p content over AirPlay with iTunes.
Yup, been doing it on my PowerBook G4 for some time. I'm really worried an update to my Apple TV will kill it.
Are you guys using some kind of special software to accomplish this? I was always under the impression that Airplay required a 2011 or newer Mac to function, which is why workarounds such as Airparrot exist. Are you saying it'll work on any Mac as long as its running Leopard or greater?