So I believe a while ago I got this to work on my msi laptop with 1060gtx by selecting DXVA2 copy-back (Optimus). I am currently trying to get this to work on my 970gtx and NONE of the options work. NVidia and the 2 DXVA2 options are enabled but when I reload a 4k HDR test video it keeps going back to avcodec. The latest nvidia driver is installed and I also updated the lav libraries but to no avail.