DestroyWindow does not close window on Mac using Python and OpenCV

Question

My program generates a series of windows using the following code:

def display(img, name, fun):
    global clicked

    cv.NamedWindow(name, 1)
    cv.ShowIm         


        

Answer 1

I had the same issue. The problem is that while(cap.isOpened()): loop does not finish so that I added below structure. When video has no frame in the following part, it returns ret values as False. Normally, I put destroyAllWindows command out of loop but I moved it into the loop. It works in my code properly.

while(cap.isOpened()):
 ret, frame = cap.read()  
 if ret == False:
        cap.release()
        cv2.waitKey(1)
        cv2.destroyAllWindows()
        cv2.waitKey(1)