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I run Jellyfin on my Windows tower with my 4K Linux ISOs streaming from a NAS. I had to fine-tune the files to direct stream to my Google TV box. I don't remember all the details but it involved lots of ffmpeg commands and downloading external subtitle files. Worth it to see every pore in Linus's face
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The only time plex has been slow is right after one of their updates before they fix the bugs they always introduce. Faster hardware won’t fix that. Also apps need better preloading when scrolling. But again faster hardware isn’t the solution to sloppy devs.

Also I play back full 4k BR disk rips.

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The new Plex app is my chief complaint with the AppleTV. The interface is a big step backwards.
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Try rivulet. It's open source and on the app store. Right now, it has better support for dolby vision profiles than the latest plex player on apple tv.
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