Neat.
I have issues with Chrome on Linux when playing 1080p videos on my 1080p monitor, ever since I disabled the h264ify plugin that (according to some here) I should have never, ever needed to have had installed to begin with.
On an i7-6700K. With an RTX 2080 Super. This is not the fastest rig, but it's plenty capable of playing a fucking 1080p Youtube video (maybe even with software decoding) as long as it isn't fucking sabotaged, like I used to do with much-lesser computers from the beginning of YouTube's 1080p streams.
(Do I have some software issues to sort out? You betcha! But the automagic shit on Youtube fails to produce usable video today, for me, just the fucking same -- without explicit help. This means that the automatic shit does not fucking work, for me -- today. And I am not alone -- see the other random complaint, above.)
(And this begs the question of: Why does this h264ify plugin, and its friends, even exist if it was never needed to begin with? For the lulz? Was it created as merely an educational experiment?)
[And as a point of comparison: 1080p Pornhub video works fine on this system. Every time. It's just smooth video without problems or aberrations. I do not know what codecs Pornhub uses, mostly because Pornhhub has never given me any reason to care about the codecs they use.
My YouTube-viewing experiences are not that way at all. By default, they fuck up. And they fuck up often. This makes me research reasons to explain, and correct for, YouTube fucking-up. Meanwhile, Pornhub works fine; it has thus not needed any corrective measures or inspection at all.]
And yes: It will always be totally cromulent for end-users like myself to bitch about the experiences they have that do not fucking work, even if (or especially if) they have some measure of technical chutzpah.
(I bitched about a thing in concert with another user who was bitching about a very similar thing. You did not provide a solution, or even a viable path towards finding a solution.)