I have a 12-core 3.33mHz Mac Pro 5,1 with 64GB ram and 980Ti gpu. Using VLC to play 4K video files (.mov) shot on my GH5 (Sigma 18-35mm) always plays back glitchy, pixelated. Not sure if its VLC player or my computer. Anybody has any ideas why the videos are playing back pixelated, glitchy? Videos are shot in 4K Cine-D, 150mbs, 30fps.