Wow! Really helpful. I shoot in 4K and was manually downsizing to 1080p!
It does seem as if part of the problem is banding, but even after adding noise/grain and change it to 16/32bit, i still get this here https://drive.google.com/file/d/0B2NqWwOlQErjSnloQkZnS2R0LVk/view?usp=sh...
Can you tell me if this is still banding or something else?
Thanks! I'll look into it :)