使用opencv提取视频关键帧

import cv2
import sys

path = 'D:\jiji_download\花花世界迷人眼❀波喵一花依世界'
video_filename = '1.❀波喵❀(Av926216547,P1).mp4'
vc = cv2.VideoCapture(path + '\\' + video_filename)

ret_val = None
if vc.isOpened():
    ret_val = True
    print("Open video succeed...")
else:
    ret_val = False
    print("Open video failed...")

timeF = 200
c = 1
while ret_val:
    ret_val, frame = vc.read()
    if c % timeF == 0:
        if not cv2.imwrite(path + '\\' + str(c) + '.jpg', frame):
            print("Write image failed, please check the image path whether is ok...")
            sys.exit(1)
    c = c + 1
vc.release()