Recently I've faced a problem where my videos on YouTube started to flicker/flashing. There are some videos that don't have this problem but mainly this problem exists.
After exporting from Premiere the video plays and doesn't have any flicker/flashing but after uploading on YouTube it starts going crazy on 1080p and lower resolutions as example:HTTP://youtu.be/2mBELo1pkL8
Did you figure out the solution to this? I'm having the same issue with whatsapp. I took iphone videos. Edited them all together in Premiere Pro. When I try to send it via whatsapp, it gets all flickery when you watch it on the phone. I tried VBR 1 pass, 2 pass, different bitrates, not sure what to do. None of the flickering shows when you watch on the computer, just once sent in whatsapp. (I send it via desktop computer via web.whatsapp because that's better quality. But then when I watch it on the phone instead of computer, it gets all glitchy and flickery.