StageVideo available but not playing on iOS

Code I am using is:

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
                    xmlns:s="library://ns.adobe.com/flex/spark"
                    creationComplete="onCreationComplete()"
                    backgroundAlpha="0"
                    backgroundColor="0x000000"
                    title="Video Player" xmlns:mx="library://ns.adobe.com/flex/mx">
          <fx:Script>
                    <![CDATA[
                              import mx.core.UIComponent;
                              private var container:UIComponent;
                              public function onCreationComplete():void
                              {
                                        this.actionBarVisible = false;
                                        this.tabBarVisible = false;
                                        NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.KEEP_AWAKE;
                                        this.addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
                              }
                              private function onAddedToStage(event:Event):void
                              {
                                        stage.addEventListener( StageVideoAvailabilityEvent.STAGE_VIDEO_AVAILABILITY , stageVideoState );
                              }
                              protected var stream:NetStream ;
                              protected function stageVideoState( e:StageVideoAvailabilityEvent ):void
                              {
                                        var available:Boolean = e.availability == StageVideoAvailability.AVAILABLE ;
                                        if ( available )
                                        {
                                                  var nc:NetConnection = new NetConnection() ;
                                                  nc.connect(null) ;
                                                  stream = new NetStream(nc) ;
                                                  stream.client = this ;
                                                  var video:StageVideo = stage.stageVideos[0] ;
                                                  video.viewPort = new Rectangle( 100, 100, 500 , 500 ) ;
                                                  video.attachNetStream( stream ) ;
                                                  stream.play( "http://www.overdigital.com/video/Hillman_720p23.976_2400kbps.mp4") ;
                                        }
                              }
                              public function onMetaData( info:Object ):void
                              {
                              }
                              private function handleActivate(event:Event):void
                              {
                                        NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.KEEP_AWAKE;
                              }
                              private function handleDeactivate(event:Event):void
                              {
                                        NativeApplication.nativeApplication.exit();
                              }
                    ]]>
          </fx:Script>
          <fx:Declarations>
                    <!-- Place non-visual elements (e.g., services, value objects) here -->
          </fx:Declarations>
</s:View>