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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.
Can't you compress what the HDMI outputs in real time so that it would have a normal size?
Sure. But why bother when you can rip it right from the disc in higher quality than you could ever hope to capture in real time?
All I can think of would be capturing a live broadcast of something airing on TV, and only on TV. Which... Has to be pretty rare these days. And you still have better methods to capture even that!