Camera sometimes closes as soon as it’s initialised. Seems to depend on the hardware in use, and only happens sometimes. Adding a delay between initialisation and actually retrieving frames seems to help. Likely due to first retrieve happening before a successful grab, and StopIteration being raised straight away.

Hopefully fixable by having a retrieve/read max-attempts option instead of an instant StopIteration, which would also help with lost connections while streaming and the like.