from utils.datasets import IMG_FORMATS, VID_FORMATS, LoadImages, LoadStreams

detesets下的LoadStreams，中，update方法，改为

        while True:
            print('detesets start video')
            # Read stream `i` frames in daemon thread
            n, f, read = 0, self.frames[i], 1  # frame number, frame array, inference every 'read' frame
            # print(stream,'stream')
            # cap.open('rtsp://127.0.0.1:8554/video')
            cap.open(stream)
            time.sleep(10)
            
            while cap.isOpened() and n < f:

                n += 2
                # _, self.imgs[index] = cap.read()

                for tt in range(jump_frame):
                    cap.grab()

                if n % read == 0:
                    success, im = cap.retrieve()
                    if success:
                        self.imgs[i] = im
                    else:
                        LOGGER.warning(f'WARNING: Video stream unresponsive, please check your IP camera connection.{time.time()}')
                        self.imgs[i] = np.zeros_like(self.imgs[i])
                        cap.open(stream)  # re-open stream if signal was lost
                time.sleep(1 / self.fps[i])  # wait time

原官方程序中重连代码，cap.open(stream)只连接一次，若失败便不再连接，改为一直连接，因为调用是多线程，所以不用担心。
若更改之后仍不行，将stream改为推流的url地址，两个print一下是一样的，但是不知道为什么在连接上有差别。