When transcoding GH5 footage ( mov or mp4 ) to any of the Prores with AME I've noticed degradation of color. Have a look at the pics,

raw.jpgprores.jpg

First pic straight from camera, second is transcoded to prores.

The only transcode that seem to work is to Cineform RGBA 12-bit. But I'm on a mac so I would love to get Prores to work.

Choosing Cineform YUV 10-bit, the blockiness reappears so I am suspecting there might be some issue with the RGB YUV thingy ..

Anyone seen this before, and any workaround?