Sdi output slowly and stutters

when i use 4.22 and output the camera video by decklink 8k pro (to be honesty ,I both use the aja kona4),the problem is every 3frame have 2frame is the same,I try to genlock to my real camera, but it still not work.
if I set the quality very low,it output looks good。
my CPU is i9 ram is 64GB, gpu both test in rtx2080ti and rtx8000.
I use 25fps,1080p,10bit yuv.
guess need to code the video like h.264 or proress422 ???