@Terje If I understand correctly, you used only the h264.mp4 and h265.mp4 presets, changing the "Pixels" option from "420 8-bit" to "422 10-bit" each time. Also, try using the 8, 10 and 12-bit h265 presets; they are Andrew's new ones that work for me in the non-multibit version. I've tried non-multibit and I can render h264.mp4 at 8 and 10-bit and h265.mp4 at 8 and 10-bit. In short, in my case the non-multibit version always behaves as a sum of multibit and non-multibit. @all I'm thinking that it's the fault of my system that "gets" the 10-bit even when it shouldn't.... When I compile a new CinGG I usually delete the old cinelerra5 directory and then do a git clone. That way it shouldn't encounter any residue from the previous installation. Am I wrong? Maybe the fact that I compile not as root (except few times I use Valgrind or other tests) can be the cause of the behavior of my CinGGs?