darknet转rknn接入视频卡死的问题

错误是：
Traceback (most recent call last):
  File "/usr/lib/python3.7/multiprocessing/process.py", line 297, in _bootstrap
    self.run()
  File "/usr/lib/python3.7/multiprocessing/process.py", line 99, in run
    self._target(*self._args, **self._kwargs)
  File "rknn_camera_tiny_multiProcess.py", line 242, in video_capture
    assert ret, 'read video frame failed.'
AssertionError: read video frame failed.


模型是darknet转的rknn，不知道是不是模型转换的问题，求大神解决