Question / Help Recording in matroska format results in higher contrast/some grain


New Member
I recorded with nvenc hevc and flac for matroska, but the video looks like this:

When i tried it with quicktime, changing only flac to alac, the video looks normal:

log file:
As far as I can see, settings are not my problem, but the parameters I set for hevc_nvenc is preset=slow rc=constqp qp=15.

Is there any way to reduce the contrast that results in this grain or is the mkv container always going to do this?