I was using Adobe Premiere Elements 13 and had this same issue. I upgraded to Adobe Premiere Elements (version 17) 2019 in hopes that would fix the issue, but it did not. I just got a GoPro Hero 7 Black. The footage from the camera looks fine if I play it outside of Adobe Premiere Elements 2019. If I edit a video in Premiere and then Export it, it also looks fine. It only looks pixelated while I'm looking at the clips during editing when editing several clips at one time. If I put just one clip from the GoPro in the editor it looks fine. The pixelation is so fine it just makes it looks distorted, not huge blocks. For example straight lines look dotted. It makes editing very difficult since I can't tell how the final footage will look. These files are filmed in 1080p 60fps and they are not HEVC. They are H.264, so this is not an HEVC issue. Also, files from my Canon G7X, Sony ActionCam, and iPhone SE all look fine during edit, it's only the GoPro files that are an issue. In addition to upgrading I have tried rendering the video before editing, changing the playback quality to "highest", and changing the Video Rendering setting to Maximum Bit Depth. Also, I changed the Timeline render quality to High quality, Slow speed. All drivers are up to date on my system. Computer: MSI GT75 Titan laptop CPU: Intel Core i9-8950HK CPU @2.90 GHz Memory: 32 GB RAM Video Card: NVIDIA GeForce GTX 1080 OS: Windows 10 Pro version 1803 build 17134.523 Any help would be greatly appreciated!
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