Roku Ultra Does Not play DTS-HD MA 7.1

[One2Go 122]

My setup is a Roku Ultra version SG 4.1.63 and is connected to Dennon AVR-4311C1.Today for the first time I noticed that a MKV Movie with a DTS-HD MA 7.1 audio track did not produce any audio and the Dennon AVR just showed the default stereo lights but no sound came out.

The very same Roku passes ALL other audio formats. DD, DTS, DTS-HD MA 5.1 TrueHD 7.1 to the AVR. After searching this forum I couldn't find an answer, is there a setting in the Emby app to play from the DTS-HD MA 7.1 audio the DTS-HD MA 5.1 as that works flawless. Playing the same file to a Roku TCL TV which just has stereo speakers Emby does trancode it to two channels.

The Roku volume mode is OFF.

My Google Chromecast (AndroidTv 2.1.23g) played the very same file flawless but it was connected to a different HDMI input on the AVR. I plugged the Roku into that input but nothing changed still no audio. 

So I think that the problem must be in the Roku as the Denon AVR-4311 should automatically fold down 7.1 content to a 5.1 layout by default. Here is the weird part a few years ago a different movie but also with a DTS-HD MA 7.1 audio track played just fine. I am not sure if it was the same device or if it was a software update to this device that crewed things up.

Thanks for any help and it may be a reason to convince the wife to let me buy an NVIDIA Shield 

PS:

I think I just found the answer: "Roku devices do not support lossless DTS-HD MA 7.1 (Master Audio) passthrough. When playing files with this format, the Roku will either produce no sound, crash, or reboot. So are there any settings that can force a transcode just on the DTS-HD MA 7.1?

Edited 2 hours ago by One2Go

[Luke 42509]

Hi, does it play dts-hd 5.1?