I am converting a prores 4444 master to h264. The movie was edited in premiere, then graded in speedgrade and rendered in prores 4444.
In the original movie there is some noise, it was shoot at high iso because it's slow motion. However, it looks very good, with an acceptable quantity of noise in the dark background.
The resulting h264 is full of really noticeable block artifacts, and vignettes suffering heavy banding, and blocky pixels make the problem more visible.
I also noticed a color shift from green-ish to blue-ish.
I tried every setting, even 20mbps 5.1 with keyframes every 1 frame.
Please see attached screen capture for an example, notice the blocky content on the right.
I'm afraid that uploading this on youtube will make it even worse.
Do you have any suggestion on a better way to encode the file?
