Enhance media API transcoding and video streaming capabilities

- Added support for limiting concurrent transcoding operations in the media API to prevent resource exhaustion.
- Implemented functions to retrieve video duration and bitrate using ffprobe for improved streaming performance.
- Enhanced the generate_transcoded_stream function to handle HTTP range requests, allowing for more efficient video playback.
- Updated VideoModal component to disable fluid and responsive modes, ensuring proper container boundaries during video playback.
- Improved logging throughout the transcoding process for better error tracking and debugging.

camera-management-api/usda_vision_system/mqtt/client.py

@@ -12,7 +12,7 @@ import paho.mqtt.client as mqtt
 
 from ..core.config import Config, MQTTConfig
 from ..core.state_manager import StateManager
-from ..core.events import EventSystem, EventType, publish_machine_state_changed
+from ..core.events import EventSystem, EventType
 from .handlers import MQTTMessageHandler
 
 

camera-management-api/usda_vision_system/mqtt/handlers.py

@@ -9,7 +9,7 @@ from typing import Dict, Optional
 from datetime import datetime
 
 from ..core.state_manager import StateManager, MachineState
-from ..core.events import EventSystem, publish_machine_state_changed
+from ..core.events import EventSystem, EventType
 
 
 class MQTTMessageHandler:
@@ -47,7 +47,16 @@ class MQTTMessageHandler:
             if state_changed:
                 self.logger.info(f"📡 MQTT: Machine {machine_name} state changed to: {normalized_payload}")
                 self.logger.info(f"📡 Publishing MACHINE_STATE_CHANGED event for {machine_name} -> {normalized_payload}")
-                publish_machine_state_changed(machine_name=machine_name, state=normalized_payload, source="mqtt_handler")
+                # Use the event_system instance passed to this handler, not the global one
+                self.event_system.publish(
+                    EventType.MACHINE_STATE_CHANGED,
+                    "mqtt_handler",
+                    {
+                        "machine_name": machine_name,
+                        "state": normalized_payload,
+                        "previous_state": None
+                    }
+                )
                 self.logger.info(f"✅ Published MACHINE_STATE_CHANGED event for {machine_name} -> {normalized_payload}")
             else:
                 self.logger.info(f"📡 Machine {machine_name} state unchanged (still {normalized_payload}) - no event published")