Question HEVC videos are unwatchable

Mar 25, 2019
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Hi all thanks for any ideas in advance, I have the iPhone XS and im wanting to start moving out of just photos and playing with video, so naturally I want to use the best quality 4K 60fps, but when I import it to my PC its fuzzy, it lags it tares just looks bad. I think its to do with high efficiency mode making everything record in HEVC. I should add I can import and watch all other shooting modes aside from slomo 1080 240fps which also happens to be HEVC.

I have an i5 6500 and an r9 280x, i was prompted by windows to buy a HECV codec for 80 pence but its made absolutely no difference I cant watch or edit any footage I take, it look pristine on my phone so I dont think theres any issues there. Am I in need of an upgrade or have i set something up wrong?