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The idle heartbeat check in BirdsEyeOutputProcess.update() compares time.monotonic() (seconds since an arbitrary point, typically boot) against last_output_time which is set from datetime.datetime.now().timestamp() (Unix epoch seconds). These are completely different time bases. The subtraction produces a large negative number, so the idle heartbeat condition can never be satisfied. This means birdseye stops sending frames when all cameras go idle, instead of continuing at the configured idle_heartbeat_fps. Use datetime.datetime.now().timestamp() consistently for both the heartbeat check and the output time tracking.