摄像头读取视频

import cv2
cap = cv2.VideoCapture(0)
while(True):
    ret,frame=cap.read()
    gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    cv2.imshow('frame',gray)
    if cv2.waitKey(1)&0xFF==ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

获取保存播放视频

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)&0xFF==ord('q'):
            break
    else:
        break
cap.release()
out.release()
cv2.destroyAllWindows()