I have infuse 2.0 pro and a mkv file coded with .264. It’s plays fine on my ipad mini retina but when I turn on airplay to play to my Apple TV 3. It only loads up 1 frame into the screen and freezes.
same for me.
Is your Apple TV connected to an AV receiver or just a TV?
If connected to just a TV, you may try disabling the Dolby Digital over AirPlay option which can be found in the audio playback settings menu.