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Couldn't find this searching the forums, so apologies if it's already been covered elsewhere.... Beginning in July, noticed some files just failed to play in the emby app on my Roku 2 4210R, cycling on "Retrieving". Server log showed too many errors and giving up on playback, and I could see multiple ffmpeg processes being spawned until the CPU on my emby server maxed out and I had to force an OS restart. What was odd was that these were media files I'd streamed before from my emby server to this specific roku with no problems. Wanted to blame windows updates (emby server is Win10, pulling files from a Synology NAS*), but I noticed my Roku Premiere+ on a different TV was able to play the same streamed files without issue. No problems when using the web player from my laptop, and the emby app in my android phone. Eventually figured out that the problem combination is HEVC coded files streamed to my Roku 2, but only after it updated to v10 of the Roku software (build 4209). Ran the files through MKVToolNix, no change - definitely only this combination seems to hit the issue. It is a 6 year old Roku, so I can't say I'm surprised it's not working, but it appears that Roku broke HEVC support for some older Roku devices with the latest software update. Hope this saves someone else some pain (if this already hasn't been covered elsewhere) [*I tried running emby server on my Synology, but it didn't work well and I had a spare NUC to use as an emby server] embyserver.txt