Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Tarvaln
Level 7

Roku 4640: No sound when trying to play Dolby D with Youtube 5.1 videos.

I have a 2016 Ultra which I need for the optical port. I've noticed over the past few months that some channels on youtube are using some codec that puts my receiver in Dolby D mode. However, there is no sound. How do I fix this without just turning my roku to stereo output only? 

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