Problem: Grain "pump effect" Hardware Encoding Nvidia Nvenc

As I use “Grain” there is a clearly visible problem with Nvidia hardware encoding (Nvenc). Both with H264 and H265, no matter what bitrate. With another format like ProRes etc. there is no problem.

Problem: The grain effect is only clearly visible every 4 frames. There is a “pump effect”. Thus Grain has actually no sense.

I tested the ProRes file created with Topaz AI with Handbrake and XMediaRecode. There is no problem with the Nvenc. I guess the problem can be fixed with a simple parameter in ffmpeg.