stop creating a config subscriber per capture thread (#24002)

frigate/video/ffmpeg.py

@@ -54,18 +54,11 @@ def capture_frames(
     skipped_eps = EventsPerSecond()
     skipped_eps.start()
 
-    config_subscriber = CameraConfigUpdateSubscriber(
-        None, {config.name: config}, [CameraConfigUpdateEnum.enabled]
-    )
-
-    def get_enabled_state():
-        """Fetch the latest enabled state from ZMQ."""
-        config_subscriber.check_for_updates()
-        return config.enabled
-
-    try:
     while not stop_event.is_set():
-            if not get_enabled_state():
+        # CameraWatchdog applies enabled updates onto this same CameraConfig
+        # before it stops ffmpeg. Do not subscribe here: it would be rebuilt per
+        # ffmpeg restart and strand a pipe in the idle main process config PUB.
+        if not config.enabled:
             logger.debug(f"Stopping capture thread for disabled {config.name}")
             break
 
@@ -81,9 +74,7 @@ def capture_frames(
             if stop_event.is_set():
                 break
 
-                logger.error(
+            logger.error(f"{config.name}: Unable to read frames from ffmpeg process.")
-                    f"{config.name}: Unable to read frames from ffmpeg process."
-                )
 
             if ffmpeg_process.poll() is not None:
                 logger.error(
@@ -105,8 +96,6 @@ def capture_frames(
             skipped_eps.update()
 
         frame_index = 0 if frame_index == shm_frame_count - 1 else frame_index + 1
-    finally:
-        config_subscriber.stop()
 
 
 class CameraWatchdog(threading.Thread):