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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
I use Stremio and only stream full 4K Blu Ray rips, with HDR and Dolby Atmos and all. So nothing is recompressed. 50-70GB files but it starts streaming almost instantly.
I have a poor 5G signal due to a tree that's blocking my view of the antenna, so I get anywhere between 400Mbps and 1400Mbps (I'm supposed to get a gigabit but it's usually closer to 500). Even with a poor signal it's still way faster than any other ISP in my town.