adding output process to handle downstream processing of frames

frigate/app.py

@@ -24,6 +24,7 @@ from frigate.log import log_process, root_configurer
 from frigate.models import Event, Recordings
 from frigate.mqtt import create_mqtt_client
 from frigate.object_processing import TrackedObjectProcessor
+from frigate.output import output_frames
 from frigate.record import RecordingMaintainer
 from frigate.stats import StatsEmitter, stats_init
 from frigate.video import capture_camera, track_camera
@@ -128,6 +129,7 @@ class FrigateApp:
         # Queues for clip processing
         self.event_queue = mp.Queue()
         self.event_processed_queue = mp.Queue()
+        self.video_output_queue = mp.Queue()
 
         # Queue for cameras to push tracked objects to
         self.detected_frames_queue = mp.Queue(
@@ -214,10 +216,25 @@ class FrigateApp:
             self.detected_frames_queue,
             self.event_queue,
             self.event_processed_queue,
+            self.video_output_queue,
             self.stop_event,
         )
         self.detected_frames_processor.start()
 
+    def start_video_output_processor(self):
+        output_processor = mp.Process(
+            target=output_frames,
+            name=f"output_processor",
+            args=(
+                self.config,
+                self.video_output_queue,
+                self.stop_event,
+            ),
+        )
+        output_processor.daemon = True
+        self.output_processor = output_processor
+        output_processor.start()
+
     def start_camera_processors(self):
         model_shape = (self.config.model.height, self.config.model.width)
         for name, config in self.config.cameras.items():
@@ -308,10 +325,10 @@ class FrigateApp:
             self.log_process.terminate()
             sys.exit(1)
         self.start_detectors()
+        self.start_video_output_processor()
         self.start_detected_frames_processor()
         self.start_camera_processors()
         self.start_camera_capture_processes()
-        self.start_birdseye_outputter()
         self.init_stats()
         self.init_web_server()
         self.start_event_processor()

frigate/object_processing.py

@@ -538,7 +538,7 @@ class CameraState:
             self.regions = regions
             self._current_frame = current_frame
             if self.previous_frame_id is not None:
-                self.frame_manager.delete(self.previous_frame_id)
+                self.frame_manager.close(self.previous_frame_id)
             self.previous_frame_id = frame_id
 
 
@@ -551,6 +551,7 @@ class TrackedObjectProcessor(threading.Thread):
         tracked_objects_queue,
         event_queue,
         event_processed_queue,
+        video_output_queue,
         stop_event,
     ):
         threading.Thread.__init__(self)
@@ -561,10 +562,10 @@ class TrackedObjectProcessor(threading.Thread):
         self.tracked_objects_queue = tracked_objects_queue
         self.event_queue = event_queue
         self.event_processed_queue = event_processed_queue
+        self.video_output_queue = video_output_queue
         self.stop_event = stop_event
         self.camera_states: Dict[str, CameraState] = {}
         self.frame_manager = SharedMemoryFrameManager()
-        self.birdseye_frame_manager = BirdsEyeFrameManager()
 
         def start(camera, obj: TrackedObject, current_frame_time):
             self.event_queue.put(("start", camera, obj.to_dict()))
@@ -719,12 +720,14 @@ class TrackedObjectProcessor(threading.Thread):
                 frame_time, current_tracked_objects, motion_boxes, regions
             )
 
-            self.birdseye_frame_manager.update_frame(
+            self.video_output_queue.put(
-                camera,
+                (
-                len(current_tracked_objects),
+                    camera,
-                len(motion_boxes),
+                    frame_time,
-                camera_state.current_frame_time,
+                    current_tracked_objects,
-                camera_state._current_frame,
+                    motion_boxes,
+                    regions,
+                )
             )
 
             # update zone counts for each label

frigate/output.py

@@ -0,0 +1,29 @@
+import queue
+from multiprocessing import shared_memory
+from frigate.util import SharedMemoryFrameManager
+
+
+def output_frames(config, video_output_queue, stop_event):
+    frame_manager = SharedMemoryFrameManager()
+    previous_frames = {}
+
+    while True:
+        try:
+            (
+                camera,
+                frame_time,
+                current_tracked_objects,
+                motion_boxes,
+                regions,
+            ) = video_output_queue.get(True, 10)
+        except queue.Empty:
+            continue
+
+        frame_id = f"{camera}{frame_time}"
+
+        frame = frame_manager.get(frame_id, config.cameras[camera].frame_shape_yuv)
+
+        if camera in previous_frames:
+            frame_manager.delete(previous_frames[camera])
+
+        previous_frames[camera] = frame_id