bug: How to set hevc_nvmpi parameters for lossless compression?

[allenxcp]

Lossless compression was performed using libx265 and hevc_nvmpi respectively. The compression with libx265 succeeded, and the compressed file size is 1.9 GB. However, the compression with hevc_nvmpi failed, and the compressed file is only 10.64 MB. The parameters are as shown in the figure below:
ffmpeg -r 10 -f image2 -i %d.jpg -c:v libx265 -x265-params lossless=1 output_r10_h265_x265_lossless.mp4

ffmpeg -r 10 -f image2 -i %d.jpg -c:v hevc_nvmpi -qp 0 output_r10_h265_nvmpi_qp0.mp4

[allenxcp]

@Keylost

system info:

[Keylost]

Hi, @allenxcp!
The case of qp=0 is indeed not handled in nvmpi, and there is no parameter to enable lossless mode. I’ll try to add it later.

[allenxcp]

Hi ,@Keylost
I noticed there's a flag enableLossless=true in the code. Can lossless compression be achieved through this flag? If so, how should I set the parameters in the ffmpeg command?