opencv视频保存

import numpy as np 
import cv2

cap = cv2.VideoCapture(0)
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter(' output.avi', fourcc, 20.0, (640, 480))

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret == True:
        frame = cv2.flip(frame, 0)
        out.write(frame)

        cv2.imshow('frame', frame)
        if cv2.waitKey(1) == ord('q'):
            break
    else:
        break

cap.release()
out.release()
cv2.destroyAllWindows()