JetPack 4.5 - nvv4l2h264enc no more one instance with opencv 4.5.2 (Segmentation fault)

Do they fail when launched in the same gst-launch command ?

gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, width=320, height=240, framerate=15/1, format=MJPG ! nvv4l2decoder mjpeg=1 ! nvvidconv ! xvimagesink      v4l2src device=/dev/video1 ! image/jpeg, width=320, height=240, framerate=15/1, format=MJPG ! nvv4l2decoder mjpeg=1 ! nvvidconv ! xvimagesink