skip regions when the queue is too full and add more locks

detect_objects.py

@@ -72,7 +72,6 @@ def main():
     client.loop_start()
     
     # Queue for prepped frames, max size set to number of regions * 3
-    max_queue_size = sum([len(camera['regions'])*3 for name, camera in CONFIG['cameras'].items()])
     prepped_frame_queue = queue.Queue()
 
     cameras = {}
@@ -81,17 +80,14 @@ def main():
             prepped_frame_queue, client, MQTT_TOPIC_PREFIX)
 
     fps_tracker = EventsPerSecond()
-    queue_full_tracker = EventsPerSecond()
 
     prepped_queue_processor = PreppedQueueProcessor(
         cameras,
         prepped_frame_queue,
-        fps_tracker,
+        fps_tracker
-        queue_full_tracker
     )
     prepped_queue_processor.start()
     fps_tracker.start()
-    queue_full_tracker.start()
 
     for name, camera in cameras.items():
         camera.start()
@@ -111,8 +107,7 @@ def main():
             'coral': {
                 'fps': fps_tracker.eps(),
                 'inference_speed': prepped_queue_processor.avg_inference_speed,
-                'queue_length': prepped_frame_queue.qsize(),
+                'queue_length': prepped_frame_queue.qsize()
-                'queue_full_events_per_min': queue_full_tracker.eps(60)
             }
         }
 

frigate/object_detection.py

@@ -2,6 +2,7 @@ import datetime
 import time
 import cv2
 import threading
+import copy
 import prctl
 import numpy as np
 from edgetpu.detection.engine import DetectionEngine
@@ -9,7 +10,7 @@ from edgetpu.detection.engine import DetectionEngine
 from frigate.util import tonumpyarray, LABELS, PATH_TO_CKPT, calculate_region
 
 class PreppedQueueProcessor(threading.Thread):
-    def __init__(self, cameras, prepped_frame_queue, fps, queue_full):
+    def __init__(self, cameras, prepped_frame_queue, fps):
 
         threading.Thread.__init__(self)
         self.cameras = cameras
@@ -19,16 +20,12 @@ class PreppedQueueProcessor(threading.Thread):
         self.engine = DetectionEngine(PATH_TO_CKPT)
         self.labels = LABELS
         self.fps = fps
-        self.queue_full = queue_full
         self.avg_inference_speed = 10
 
     def run(self):
         prctl.set_name(self.__class__.__name__)
         # process queue...
         while True:
-            if self.prepped_frame_queue.full():
-                self.queue_full.update()
-
             frame = self.prepped_frame_queue.get()
 
             # Actual detection.
@@ -58,7 +55,8 @@ class RegionRequester(threading.Thread):
             frame_time = self.camera.frame_time.value
 
             # grab the current tracked objects
-            tracked_objects = list(self.camera.object_tracker.tracked_objects.values()).copy()
+            with self.camera.object_tracker.tracked_objects_lock:
+                tracked_objects = copy.deepcopy(self.camera.object_tracker.tracked_objects).values()
 
             with self.camera.regions_in_process_lock:
                 self.camera.regions_in_process[frame_time] = len(self.camera.config['regions'])
@@ -93,8 +91,9 @@ class RegionRequester(threading.Thread):
 
 
 class RegionPrepper(threading.Thread):
-    def __init__(self, frame_cache, resize_request_queue, prepped_frame_queue):
+    def __init__(self, camera, frame_cache, resize_request_queue, prepped_frame_queue):
         threading.Thread.__init__(self)
+        self.camera = camera
         self.frame_cache = frame_cache
         self.resize_request_queue = resize_request_queue
         self.prepped_frame_queue = prepped_frame_queue
@@ -105,6 +104,15 @@ class RegionPrepper(threading.Thread):
 
             resize_request = self.resize_request_queue.get()
 
+            # if the queue is over 100 items long, only prep dynamic regions
+            if resize_request['region_id'] != -1 and self.prepped_frame_queue.qsize() > 100:
+                with self.camera.regions_in_process_lock:
+                    self.camera.regions_in_process[resize_request['frame_time']] -= 1
+                    if self.camera.regions_in_process[resize_request['frame_time']] == 0:
+                        del self.camera.regions_in_process[resize_request['frame_time']]
+                self.camera.skipped_region_tracker.update()
+                continue
+
             frame = self.frame_cache.get(resize_request['frame_time'], None)
             
             if frame is None:

frigate/video.py

@@ -167,7 +167,6 @@ class Camera:
         self.objects_tracked = mp.Condition()
 
         # Queue for prepped frames, max size set to (number of regions * 5)
-        max_queue_size = len(self.config['regions'])*5
         self.resize_queue = queue.Queue()
 
         # Queue for raw detected objects
@@ -184,6 +183,7 @@ class Camera:
         self.ffmpeg_process = None
         self.capture_thread = None
         self.fps = EventsPerSecond()
+        self.skipped_region_tracker = EventsPerSecond()
 
         # combine tracked objects lists
         self.objects_to_track = set().union(global_objects_config.get('track', ['person', 'car', 'truck']), camera_objects_config.get('track', []))
@@ -214,7 +214,7 @@ class Camera:
         self.frame_tracker.start()
 
         # start a thread to resize regions
-        self.region_prepper = RegionPrepper(self.frame_cache, self.resize_queue, prepped_frame_queue)
+        self.region_prepper = RegionPrepper(self, self.frame_cache, self.resize_queue, prepped_frame_queue)
         self.region_prepper.start()
 
         # start a thread to store the highest scoring recent frames for monitored object types
@@ -275,6 +275,7 @@ class Camera:
         print("Starting a new capture thread...")
         self.capture_thread.start()
         self.fps.start()
+        self.skipped_region_tracker.start()
     
     def start_ffmpeg(self):
         ffmpeg_cmd = (['ffmpeg'] +
@@ -310,11 +311,16 @@ class Camera:
             'finished_frame_queue': self.finished_frame_queue.qsize(),
             'refined_frame_queue': self.refined_frame_queue.qsize(),
             'regions_in_process': self.regions_in_process,
-            'dynamic_regions_per_sec': self.dynamic_region_fps.eps()
+            'dynamic_regions_per_sec': self.dynamic_region_fps.eps(),
+            'skipped_regions_per_sec': self.skipped_region_tracker.eps(60)
         }
     
     def frame_with_objects(self, frame_time, tracked_objects=None):
+        if not frame_time in self.frame_cache:
+            frame = np.zeros(self.frame_shape, np.uint8)
+        else:
             frame = self.frame_cache[frame_time].copy()
+            
         detected_objects = self.detected_objects[frame_time].copy()
 
         for region in self.regions:
@@ -326,6 +332,7 @@ class Camera:
         # draw the bounding boxes on the screen
 
         if tracked_objects is None:
+            with self.object_tracker.tracked_objects_lock:
                 tracked_objects = copy.deepcopy(self.object_tracker.tracked_objects)
 
         for obj in detected_objects: