This is rare because I haven't seen anyone with this specific issue in the time I've been searching.
I've been dealing with this for about a year and I would love to figure out the root of the problem. I try and screenrecord my workflow on logic pro X using quicktime player– when I playback in the regular quicktime preview, it looks totally fine but when I put it into premiere, it starts to appear glitchy, sort of like a 'data moshing' effect. If you're unfamilar with the term 'datamoshing' here's a cool video: https://www.youtube.com/watch?v=DPa7SZs8Obc but in my case it's not cool and unintentional.
Not sure why it's doing this to my screenrecorded files in Premiere; it happens randomly throughout the video, on playback and export, distorting colours, parts having massive pixels like it was filmed in 280p. People tell me the effect looks cool, but I would honestly like to figure out how to make it normal. I'll post the specs of my computer below as well as try to upload a video of the issue.
I've tried screen recording with other programs like loom and it actually works fine, however that costs monthly and quicktime is free. Ive tried wiping media caches from my iMac, the issue still persists. I've also tried to screenrecord on my 2013 macbook pro, OS catalina, same version of premiere pro, and I think it's the same version of quicktime too and it works perfectly as it should, however this computer has 3gb of free space... sorry for the novel but I am so perplexed by this issue.
Now for the specs:
I use a 2017 iMac (retina 5K, 27inch)
Processor 3.4 GHz quad core intel i5
memory 8gb 2400 MHz DDR4
graphics Radeon Pro 570 4GB
and it's on BIG SUR, although this issue started last year with catalina.
Ya so like I said, I would love to figure the root of this issue so I can get back to editing videos using screen recordings. Do you think it's a hardware issue, OS issue, Quicktime issue, or premiere issue?
Have the EXACT same issue. I've also had it where imports into AE / Premiere have lost all of the grey's in the screen recording. (Not great when you're doing tutorials when there's A LOT of gradients.)
What's worked for me is running the videos through media encoder and exporting at Match Source at different file-types. The best seems to be MPEG-2. JPEG worked also, and mp4 kinda, but MPEG-2 seems to be the winner so far.