IMX219 not detecting frame

I am trying to run this code with csi camera on jetson nano.
I have tested the camera and it works fine . But when I run it on this code, it shows No frame.

Can you please help me understand how to figure this out?
Its a bit urgent!
Thank you! (1.6 KB)

is it duplicated? please follow-up Topic 247267 instead of creating new topic for the same issues.

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