import cv2
url = 'rtsp://admin:我的密码@我的摄像头IP如169.254.115.55:554/h264/ch1/main/av_stream'
cap = cv2.VideoCapture(url)
while(cap.isOpened()):  
    # Capture frame-by-frame  
    ret, frame = cap.read()  
    # Display the resulting frame  

    # 读图保存图
    cv2.imwrite("path",frame)
    cv2.imshow('frame',frame)  

    if cv2.waitKey(1) & 0xFF == ord('q'):  
        break  
# When everything done, release the capture   
cap.release()  
cv2.destroyAllWindows()