         #keyPath(currentItem),
         #keyPath(currentItem.playbackLikelyToKeepUp),
         #keyPath(currentItem.playbackBufferEmpty),
-        #keyPath(currentItem.duration)
-        //        #keyPath(currentItem.tracks)
+        #keyPath(currentItem.duration),
+        #keyPath(currentItem.tracks)
     ]
     
     private var observerContext = 0

        } else if keyPath == #keyPath(currentItem.status) {
            if currentItem?.status == .readyToPlay {
                self.setupNonObservablePropertiesUpdateTimer()
                
                let newState = PlayerState.ready
                self.postEvent(event: PlayerEvents.loadedMetadata())
                self.postStateChange(newState: newState, oldState: self.currentState)

            self.postStateChange(newState: newState, oldState: self.currentState)
            self.currentState = newState
        }
        
        if let currentEvent: PKEvent = event {
           self.postEvent(event: currentEvent)
        }
