keep existing background after ffc events #124
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Currently the background is updated always after an ffc event. This is causing some problems in recodings such as:
https://browse.cacophony.org.nz/recording/869743?device=1503
where an animal is in the frame during an ffc event.
The danger with not resetting the background is often pixels are a lot warmer after ffc events, so it may increase false triggers by comparing the current frame to the backgorund pre FFC.