RTMP memory leak on deployed AIR applications?

Hi,

I am building a simple AIR application for personal use which plays a live RTMP stream. While building an AIR package and running the application for long time, I noticed that there was a memory leak with the application which eventually crashes it. The code is very simple... and could not figure out where the leak is coming from. Maybe this is a AIR runtime bug? If anyone has any clue, please help me out!

The codes is as below:

package
{
          import flash.display.Sprite;
          import flash.display.StageAlign;
          import flash.display.StageScaleMode;
          import flash.events.Event;
          import flash.events.NetStatusEvent;
          import flash.events.TimerEvent;
          import flash.media.Video;
          import flash.net.NetConnection;
          import flash.net.NetStream;
          import flash.net.URLLoader;
          import flash.net.URLRequest;
          import flash.system.System;
          import flash.utils.Timer;
          [SWF(backgroundColor="#0", frameRate="60", width="1920", height="1080")]
          public class KBSStreamTest extends Sprite
          {
                    private var _dataLoader:URLLoader;
                    private var _video:Video;
                    private var _nc:NetConnection;
                    private var _ns:NetStream;
                    private var _playing:Boolean;
                    public function KBSStreamTest()
                    {
                              stage.scaleMode = StageScaleMode.NO_SCALE;
                              stage.align = StageAlign.TOP_LEFT;
                              _nc = new NetConnection();
                              _nc.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
                              _video = new Video(1920, 1080);
                              _video.smoothing = true;
                              addChild(_video);
                              _video.attachNetStream(_ns);
                              getData();
                              var t:Timer = new Timer(1000);
                              t.start();
                              t.addEventListener(TimerEvent.TIMER, gc);
                    }
                    private function gc(event:TimerEvent):void
                    {
                              System.gc();
                    }
                    private function getData():void
                    {
                              if (_dataLoader)
                              {
                                        _dataLoader = null;
                                        _dataLoader.removeEventListener(Event.COMPLETE, onDataLoadComplete);
                              }
                              _dataLoader = new URLLoader();
                              _dataLoader.load(new URLRequest("http://k.kbs.co.kr/KplayerWCFService/KplayerRest.svc/json/GetLiveChannelStreamURLSSO/11/0"));
                              _dataLoader.addEventListener(Event.COMPLETE, onDataLoadComplete);
                    }
                    private function onDataLoadComplete(event:Event):void
                    {
                              openStream(JSON.parse(_dataLoader.data).StreamItemWithURL.AUTHSTREAMURL);
                    }
                    private function openStream(url:String):void
                    {
                              _nc.connect(url);
                    }
                    private function onNetStatus(event:NetStatusEvent):void
                    {
                              trace("::: netStatus", event.info.code);
                              switch (event.info.code)
                              {
                                        case "NetConnection.Connect.Success":
                                                  trace("connection success");
                                                  _ns = new NetStream(_nc);
                                                  _ns.client = this;
                                                  _ns.play("");
                                                  _video.attachNetStream(_ns);
                                                  _playing = true;
                                                  break;
                                        case "NetStream.Play.StreamNotFound":
                                        case "NetConnection.Connect.Rejected":
                                        case "NetConnection.Connect.Failed":
                                        case "NetConnection.Connect.Closed":
                                                  break;
                              }
                    }
                    public function onMetaData(obj:Object = null):void
                    {
                              trace("onMetaData");
                              for (var i:String in obj)
                              {
                                        trace(i, obj);
                              }
                    }
          }
}