如何防止python中的IP摄像机帧延迟

Question

我在python 3和ide spider中使用请求模块。当我选择帧分辨率1920X1080和帧速率25 fps时，它毫无问题地运行到网页上。但这是我的python代码出现的延迟。当我更改帧速率10 fps或分辨率1280x720时，它可以正常运行

    r = requests.get(url, auth=HTTPDigestAuth('username', 'pass'), 
    stream=True)               
    def get_frame_from_stream(r):
      if(r.status_code == 200):
      bytes=b'' 
      for chunk in r.iter_content(chunk_size=None):
      bytes += chunk
      a = bytes.find(b'\xff\xd8')
      b = bytes.find(b'\xff\xd9')
      if a != -1 and b != -1:
      jpg = bytes[a:b+2]
      bytes = bytes[b+2:] 
      frame=cv2.imdecode(np.frombuffer
      jpg,dtype=np.uint8)cv2.IMREAD_COLOR)
      cv2.imshow('Live',frame)
      time.sleep(0.004) 
      if cv2.waitKey(1) == 27:
        exit(0)
      else: 
      print('status code error',r.status_code)