Artifacts after HEVC 10-bit encoding using NVENC

[Mart666]

I've made a lot of encoding with these settings for 1080p videos (i use AviSyhtn as decoder) :

NVEncC64.exe --vbrhq 5000 --codec h264 --preset quality --output-depth 10 --lookahead 32 --max-bitrate 0 --aq --aq-temporal --fullrange --bluray --vbr2 5000 -i "in.avs" -o "out.h265"

I get perfect picture without artifacts. Tested with about 30 encodings !!!

I can use these same settings with h265 i have to remove "--bluray" i get similar really good quality too !

I only have issues with some 4K videos. I only change bitrate from 5000 to 16000. Some are perfects, some videos give me artifacts wirh h265, but if i use h264 picture is perfect... I hope this will help others !!

[Ronstang]

Thanks for the information. After I fixed most of my quality issues by switching to 10 bit color I started having weird artifacts in certain dark scenes. After reading this thread I realized I have an factory overclocked GeForce 1650 Super so I down-clocked everything as low I could go and re-encoded the movie that the artifacts first appeared as I knew right where they were. Now the artifacts are gone and the lower clock speeds did not affect encoding time at all....so I classify this as a win-win....especially since I don't play games. Only bought this GPU for the 4 pipe HEVC encoding.

I love this forum and all it's knowledgeable people always willing to help. I would not have been able to solve all my encoding issues without this place. Thanks to all.