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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Level 7

4K video playback: Roku fails but Apple TV succeeds

After several months of trying, I'm giving up on playing 4K movies with Plex on the Roku Ultra. My 4K Apple TV starts playing right away, but Roku takes forever to load the movie -- or fails completely. 

I'm running the latest version of Plex, and playing the same .mkv video, so the configuration is consistent.

Does anyone else see this difference between Roku and Apple TV?

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