YouTube has been beefing up the capabilities of its video player for quite some time now, and it first introduced 60 FPS support in June of last year. Now, some videos on the site seem to be able to play back not just at 60 FPS, but at 60 FPS in super high-def 4K resolution. It looks to be an experiment that Google is slowly introducing, as only a handful of hand picked videos are capable of this at the moment…

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