openCV 隔帧读取视频帧的方式

cap = cv2.VideoCapture(strUrl)
key_frame = 2  # 所隔帧数 
j = 0
while True:
     if key_frame >= 1:
         cap.set(cv2.CAP_PROP_POS_FRAMES, j)  # 这里的cv2.CAP_PROP_POS_FRAMES参数是说：取第j帧之后的那一帧
         j += key_frame
         hasFrame, frame = cap.read()
         if not hasFrame:
             print('视频源链接断开', strUrl)
             time.sleep(5)
             break
     cv2.imshow('show', frame)
     cv2.waitKeyEx(1)