RTSP stream crashes in tight loop

[robotrapta]

When running with an RTSP stream, at some point it can fail, and then it goes into a tight loop of failing to capture the frame hundreds of times per second:

waiting for actual_delay=0.97 to capture the next frame.
grabbed lock to read frame from buffer
could not read frame from self.capture=<VideoCapture 0x7f3a86ccd8b0>
read the frame in 29048.8ms
No frame captured! frame=None
grabbed lock to read frame from buffer
could not read frame from self.capture=<VideoCapture 0x7f3a86ccd8b0>
read the frame in 0.6ms
No frame captured! frame=None
grabbed lock to read frame from buffer
could not read frame from self.capture=<VideoCapture 0x7f3a86ccd8b0>
read the frame in 0.4ms
No frame captured! frame=None
grabbed lock to read frame from buffer
could not read frame from self.capture=<VideoCapture 0x7f3a86ccd8b0>
read the frame in 0.5ms
No frame captured! frame=None