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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.
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!