Hi. I'm having odd issues when exporting 4k sequence in varoius fomats. I renderedd in the timeline and show no issues on edges of frame but once in export window & exported color bands/fringe are showing up on the edges of frame.
Mid 2015 retina 5k // 3.3 ghz i5 // 24 GB 1600 mhz DDR3 // AMD Radeon R9 M290 2048 MB // os High Sierra
Sequence created from clips to match.
Image 1: Sequence setting + no issues on edge of frame
Image 2: Export window showing issues on edge of frame (this is seen in playblack as well)