Wait on stop event when possible

Generally eliminate the `while True` loops while waiting for a stop
event and prefer to condition the loops on if the stop event is set,
blocking on that where it makes sense.  This generally comes in 3
flavors.  First and simplest, when there is a sleep and the stop event
is the only thing the loop blocks on, instead do a check using
`stop_event.wait(timeout)` to instead block on the stop event for the
designated amount of time. Second, when there is a different event that
is blocking in the loop, condition the loop on `stop_event.is_set()`
rather than breaking when it is set. Finally, when there is a separate
internal condition that requires a counter, have the loop iterate over
the counter and use `if stop_event.wait(timeout)` internal to the loop.

frigate/object_processing.py

@@ -706,11 +706,7 @@ class TrackedObjectProcessor(threading.Thread):
         return self.camera_states[camera].get_current_frame(draw_options)
 
     def run(self):
-        while True:
-            if self.stop_event.is_set():
-                logger.info(f"Exiting object processor...")
-                break
-
+        while not self.stop_event.is_set():
             try:
                 (
                     camera,
@@ -769,3 +765,5 @@ class TrackedObjectProcessor(threading.Thread):
             while not self.event_processed_queue.empty():
                 event_id, camera = self.event_processed_queue.get()
                 self.camera_states[camera].finished(event_id)
+
+        logger.info(f"Exiting object processor...")