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All,

My setup is Kodi 15.2 running on Windows 7. Video is done through Core i3 (Sandy Bridge) on board graphics. I'm connected to a Denon x3200w via HDMI.

In Kodi, audio output is set to pass-through via WASAPI. TrueHD and DTS-HD MA are correctly passed through and detected by the AVR (info button on the AVR will show it's receiving TrueHD and DTS-MA when playing movies with those streams).

The first Atmos movie I tried was Pixels. I'm using the latest version of MakeMKV to rip Blu-Ray discs to MKV. MakeMKV correctly identified the presence of an Atmos extended TrueHD track and I selected both the core and extended tracks when ripping.

When I play back the movie with Kodi, the AVR only indicates it's receiving TrueHD instead of Atmos. When I play the physical disc via my Panasonic Blu-Ray player (also connected to the Denon), it correctly indicates Dolby Atmos.

What step did I miss?

Thanks!

Got it working and it was user error. On my Denon receiver you can tell it to process an Atmos signal as Atmos or TrueHD. I had it set to process it correctly on the input my Blu-ray player is connected to but not the input the HTPC is connected to. That input was still set to process Atmos as TrueHD. Once I set it correctly, my Atmos movies are correctly being detected as Atmos by the AVR when played through Kodi.