Artefacts on live image from IMX477 in OpenCV

1.Which seller did you purchase the product(s) from?
Scorpion vision
2.The Model number of the product(s) you have purchased?
3.Which Platform are you using the product(s) on?
Jetson Nano B01
4.Which instruction are you following?
5.Has your product ever worked properly?
Not in OpenCV
6.What problems are you experiencing?
Trying to understand why the following code, results in the black dot artefact shown below. Any suggestions very welcome.
cam_init = ‘nvarguscamerasrc exposuretimerange=“10000000 10000000” ispdigitalgainrange=“0 0” gainrange=“16 16” awblock=true wbmode=0 sensor_id=0 ! video/x-raw(memory:NVMM),width=1920, height=1080, framerate=1/60 ! nvvidconv ! appsink’

cam = cv2.VideoCapture(cam_init)

frame =

cv2.imshow(‘frame’, frame)

7.What attempts at troubleshooting have you already made?
Tried changing settings, but to no avail…
8.How would you like us to help you?
To provide suggestions of possible solutions

Hi @otills

Please refer to this example: