Try this: ROCK 3A Camera streaming with RTSP
With performance governor i can get ~ 30 FPS using your command:
gst-launch-1.0 v4l2src ! “video/x-raw,format=NV12,width=1280,height=720,framerate=30/1” ! fpsdisplaysink name=fpssink video-sink=“waylandsink”
I think your assumption is correct, i think there are two modes, 1920x1080 and 3280x2464.
I tried 3280x2464 but my kernel crashed and with mpi i got :
[ 177.172917] rkisp-vir0: MIPI drop frame