Hello. I’m using Plex on a 2019 Shield TV Pro and coming across issues with 7.1 DTS-HD not playing correctly. The Shield is connected directly to my Denon AVR-X3600H (7.1.2 setup) and I have HDMI Passthrough turned on. However, it seems like the receiver is only seeing PCM audio coming in at 5.1. It appears to be converting this to 5.1.2 and taking advantage of my front Dolby Atmos speakers. Why isn’t the receiver seeing the source as 7.1 and playing on my rear speakers? In the attached images you can see Plex is supposedly sending the 7.1 DTS-HD signal but it isn’t being received that way.
Can you restart the Plex app on your Shield and try playing that again? Get me the android log. I’d like to see what your AVR reports back to the Shield as supported codecs.