I have an older iMac (2012) and 4K HEVC videos I've taken with my iPhone 7 Plus look like absolute crap when played back in Photos. The video is blurry, far blurrier than even 1080p. I don't have a machine that can play back 4K video at the moment, but I still want to take them in 4K so that I can enjoy them in 4K in the future. Am I stuck with blurry worse-than-1080p video on my older Mac? It's almost enough to make me want to go back to taking 1080p h.264 because that looks amazing. The least High Sierra can do is scale it down to that instead of what looks like low-quality compression 720p.