* Only keep 2x detect fps frames in SHM
* Don't delete previous shm frames in output
* Catch case where images do not exist
* Ensure files are closed
* Clear out all frames when shutting down
* Correct the number of frames saved
* Simplify empty shm error handling
* Improve frame safety
* intentionally handle queues during shutdown and carefully manage shutdown order
* more carefully manage shutdown to avoid threadlocks
* use debug for signal logging
* ensure disabled cameras dont break shutdown
* typo
* Add config pub / sub pattern
* remove recording from feature metrics
* remove audio and feature metrics
* Check for updates from all cameras
* remove birdseye from camera metrics
* remove motion and detection camera metrics
* Ensure that all processes are stopped
* Stop communicators
* Detections
* Cleanup video output queue
* Use select for time sensitive polls
* Use ipc instead of tcp
* Use zmq for inter process communication
* Use localhost for reply and request
* Use pyobj instead of json and Need to use separate requestors for each audio listener
* Cleanup port defining
* Generate low res low fps previews for recordings viewer
* Make sure previews end on the hour
* Fix durations and decrase keyframe interval to ensure smooth scrubbing
* Ensure minimized resolution is compatible with yuv
* Add ability to configure preview quality
* Fix
* Clean up previews more efficiently
* Use iterator
