【大疆Tello无人机图传read_video_frame报错raise Empty】

当连接了Tello无人机的WIFI：RMTT-5621F2后，使用tl_camera.read_cv2_image函数将视频帧图传回PC出现_queue.Empty，是由于windows防火墙未关闭。

C:\Users\wsy\AppData\Local\Programs\Python\Python38\python.exe E:\yolov5\04_camera\01_video_with_display.py 
Traceback (most recent call last):
  File "E:\yolov5\04_camera\01_video_with_display.py", line 50, in <module>
    img = tl_camera.read_cv2_image()
  File "C:\Users\wsy\AppData\Local\Programs\Python\Python38\lib\site-packages\robomaster\camera.py", line 69, in read_cv2_image
    frame = self.read_video_frame(timeout, strategy)
  File "C:\Users\wsy\AppData\Local\Programs\Python\Python38\lib\site-packages\robomaster\camera.py", line 58, in read_video_frame
    return self._liveview.read_video_frame(timeout, strategy)
  File "C:\Users\wsy\AppData\Local\Programs\Python\Python38\lib\site-packages\robomaster\media.py", line 96, in read_video_frame
    return self._video_frame_queue.get(timeout=timeout)
  File "C:\Users\wsy\AppData\Local\Programs\Python\Python38\lib\queue.py", line 178, in get
    raise Empty
_queue.Empty

因此，关闭防火墙。

然后视频可以正常回传接收啦~