python 录制mp4视频

'''
python 录制mp4视频 by 郑瑞国
'''
import numpy as np
import cv2

cap = cv2.VideoCapture(0)

## some videowriter props
sz = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),
        int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))

fps = 20
#fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')
#fourcc = cv2.VideoWriter_fourcc('m', 'p', 'e', 'g')
fourcc = cv2.VideoWriter_fourcc(*'mpeg')

## open and set props
out = cv2.VideoWriter()
out.open('output.mp4',fourcc,fps,sz,True)

while(True):
    ret,frame=cap.read()
    out.write(frame)
    cv2.imshow('frame',frame)
    if cv2.waitKey(1)&0xff == ord('q'):
        break

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