ATEM ProductionStudio 4K and Western digital LIVE TV

Hi,
i need to playout videos through my Atem PS4K.
I could use a mac with FCPRO and Ultrastudio Express, but i'd prefer a stand-alone solution.
I state that i work in 1080i50 or 720p and i tried to connect to atem an appleTv but it only works in 1080p60.
So i was thinking to use a WD LiveTv but i have these doubts:
- does atem see it? can i set WDliveTV hdmi out format manually (1080i50 or 720p)?
Can you help me please?
Thanks
Roberto

I playout videos from a Windows 7 laptop via HDMI using Matrox DVI-Convert set to 720p/5994...works great. The videos are normally commercials that are assembled and formatted in Premiere Pro, then exported as a single MP4 file in Apple TV format (H.264 720p @ 2997, Matrox upconverts to 5994). For audio I actually just tap into the computer speaker or headphone output and connect it to the ATEM RCA-In jacks...

Matrox will work with Mac no problem.

Using Apple TV hardware is problematic because of the single HDMI output and no real ability to preview.

Hope this helps.

Thanks
Roberto