pulling stream error

[SoulProficiency]

i try av.open to pull a rtsp stream which is come from liveNVR.here is the error info:
Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/local/python3/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/usr/local/python3/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/home/ascend/ascend_new_arch/seal_utils/capture_server.py", line 239, in _decode_thread
for packet in self.caps[cap_ip].demux([stream[0]]):
File "av/container/input.pyx", line 170, in demux
File "av/container/core.pyx", line 285, in av.container.core.Container.err_check
File "av/error.pyx", line 336, in av.error.err_check
av.error.ExitError: [Errno 1414092869] Immediate exit requested: 'rtsp://192.168.10.207:554/stream_1'
how can we overcome this issue? this rtsp stream can be pulled by VLC or opencv-python