获取视频时长，截帧

# 安装 opencv-python

import cv2
import numpy as np
path = r'D:\Users\Administrator\Desktop\1.mp4'
vc = cv2.VideoCapture(path)

if (vc.isOpened()):
		rval, frame = vc.read()
		print('Open')
else:
		print('Fail to open!')

if rval:
		length = vc.get(cv2.CAP_PROP_FRAME_COUNT)
		print(length)
		iFps = vc.get(cv2.CAP_PROP_FPS)
		print(iFps)
		rval, frame = vc.read()
		b = frame.tolist()
		alls = length/iFps
		print(alls)
		m, s = divmod(alls, 60)
		print(int(m), int(s))


		cv2.imwrite(r"D:\Users\Administrator\Desktop\论坛.jpg", frame)
vc.release()