TCL Roku TV AV1

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Need more info like the model number, if you have the link to the page where this technical information is that would be helpful.

EDIT: Reading comprehension is helpful. Sorry, was a busy day.

Also, AV1 support on Roku is spotty. I bought a Roku Ultra as well as a new gen Roku stick with the idea that they support AV1. Turns out they don't really support it except in specific circumstances (DASH) and will always call for it to be transcoded when receiving it from Jellyfin. My guess is that your TV is the same. You can likely sideload your AV1 videos, but that defeats the purpose. Once you share more info, we might be able to investigate a little bit more.

Here's where I show my ignorance -- I don't believe there is a server-side setting for using HLS/DASH format streaming. The iOS apps have a way to prefer something like that. I wonder if there's a method to incorporate that into the Roku profile when encountering AV1 media. I'm not sure how complex the profiles are for these and I know they've cause issues before. But it would be nice if DASH streaming could be implemented to help out folks who have partial AV1 support in this way.