PCM or AAC 5.1 Surround over Apple TV HDMI?

I'm not sure if its possible for me to do what I'd like. In my work setup I actually do have audio coming out of my workstation as PCM over a MOTU HD Express HDMI connection to a Marantz receiver, and that works even at 96k 24-bit. So I was really hoping I could at least export 16-bit PCM (or even AAC for that matter) to Quicktime files to play in surround over my home receiver (different room than my work setup) over the Apple TV.

MC572LL/A

Apple TV 6.0.2

The Apple TV is connected to a Denon receiver over HDMI.

What does play back in surround:

Handbraked DVD's (using Apple TV3 preset) play in surround fine and show up as Dolby AC3. I know my movie files don't contain AC3, but am just illustrating that the receiver at least does receive surround in those instances.

What does not play back in surround:

Quicktime files that contain either PCM, or AAC 5.1 audio only. The receiver indicates the audio is stereo only.

Here is the info for one example movie file I'm trying to get to play in surround over this setup.

These video files are created/exported from AVID Pro Tools. It's easy enough to export the embedded audio in AAC 5.1, or PCM 5.1 to these files, but not an AC3 encoded file. I do surround sound work, and all I'm trying to do is export some surround files to check on my home theatre.

I'm currently checking to see if there is some receiver setting I'm missing, but since I haven't found anything yet, thought I'd ask if it's even possible to do what I'm trying using an Apple TV.

Thanks for any input!