RK MPP (vpu) encoding issue for JPEG, any help?

I’m trying to use mpp in debian-linux-aarch64, but it always fail to encode by this reason,

my rockchip-linux mpp issue

MPP cannot encode any JPEG ( MJPEG ) from any sources, RGB or YUV20 whatever it is.
According to qvoid of github, fd not be allocated by vpu_service, or mpp.
Anyone knows how to solve it ?

I don’t understand how qvoid should encoded my YUV source, and why some people (included me ) impossible to encode any image with mpp ?
I’ve been tested mpp in Rock960B, Rock960C and Excavator.

Regards, Raph.