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You need to check that your video is finished. 'ret' from cap.read() is always True whenever there is a frame, False when we reach to the end of the video and there is no frame to read.

import cv2
cap = cv2.VideoCapture('C:\Users\wg\174037210.avi')
while(cap.isOpened()):
    ret, frame = cap.read()

    if not ret:
        break

    cv2.imshow('Video', frame)
    if cv2.waitKey(75) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

You need to check that your video is finished. 'ret' ret from cap.read() cap.read() is always True whenever there is a frame, False when we reach to the end of the video and there is no frame to read.

import cv2
cap = cv2.VideoCapture('C:\Users\wg\174037210.avi')
while(cap.isOpened()):
    ret, frame = cap.read()

    if not ret:
        break

    cv2.imshow('Video', frame)
    if cv2.waitKey(75) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()