prevent the cache from growing indefinitely

config/config.example.yml

@@ -17,6 +17,17 @@ mqtt:
  #################
  # password: password # Optional
 
+################
+# Global configuration for saving clips
+################
+save_clips:
+ ###########
+ # Maximum length of time to retain video during long events.
+ # If an object is being tracked for longer than this amount of time, the cache 
+ # will begin to expire and the resulting clip will be the last x seconds of the event.
+ ###########
+ max_seconds: 300
+
 #################
 # Default ffmpeg args. Optional and can be overwritten per camera.
 # Should work with most RTSP cameras that send h264 video

detect_objects.py

@@ -290,7 +290,7 @@ def on_connect(client, userdata, flags, rc):
  camera_process['process'].start()
  print(f"Camera_process started for {name}: {camera_process['process'].pid}")
 
- event_processor = EventProcessor(CONFIG['cameras'], camera_processes, '/cache', '/clips', event_queue, stop_event)
+ event_processor = EventProcessor(CONFIG, camera_processes, '/cache', '/clips', event_queue, stop_event)
  event_processor.start()
 
  object_processor = TrackedObjectProcessor(CONFIG['cameras'], client, MQTT_TOPIC_PREFIX, tracked_objects_queue, event_queue, stop_event)

frigate/events.py

@@ -73,6 +73,11 @@ def refresh_cache(self):
  earliest_event = min(self.events_in_process.values(), key=lambda x:x['start_time'])['start_time']
  else:
  earliest_event = datetime.datetime.now().timestamp()
+
+ # if the earliest event exceeds the max seconds, cap it
+ max_seconds = self.config.get('save_clips', {}).get('max_seconds', 300)
+ if datetime.datetime.now().timestamp()-earliest_event > max_seconds:
+ earliest_event = datetime.datetime.now().timestamp()-max_seconds
 
  for f, data in list(self.cached_clips.items()):
  if earliest_event-90 > data['start_time']+data['duration']:
@@ -147,7 +152,11 @@ def run(self):
 
  self.refresh_cache()
 
- save_clips_config = self.config[camera].get('save_clips', {})
+ save_clips_config = self.config['cameras'][camera].get('save_clips', {})
+
+ # if save clips is not enabled for this camera, just continue
+ if not save_clips_config.get('enabled', False):
+ continue
 
  # if specific objects are listed for this camera, only save clips for them
  if 'objects' in save_clips_config:
@@ -158,7 +167,7 @@ def run(self):
  self.events_in_process[event_data['id']] = event_data
 
  if event_type == 'end':
- if save_clips_config.get('enabled', False) and len(self.cached_clips) > 0 and not event_data['false_positive']:
+ if len(self.cached_clips) > 0 and not event_data['false_positive']:
  self.create_clip(camera, event_data, save_clips_config.get('pre_capture', 30))
  del self.events_in_process[event_data['id']]