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please make it a habit to check, if resources load properly, you should test:

if not cap.isOpened() # did we get a connection at all ?

and also, in your loop:

if ret == False  # the connection broke, or the stream came to an end

please make it a habit to check, if resources load properly, you should test:

if not cap.isOpened() # did we get a connection at all ?

and also, in your loop:

if ret == False  # the connection broke, or the stream came to an end