https://quasitv.app lets you do the same with your own media. You can give it an input (say your Plex library) and it creates pseudo channels. It can auto-generate channels based on content or source, or you can create your own channels. Pretty cool stuff 2/2
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I think you have to get a paid version (like 5 bucks) to be able to create custom channels - then you can create a blank channel and add to it shows you want.