package {
 import flash.display.DisplayObject;
 import flash.display.Loader;
 import flash.display.Sprite;
 import flash.events.Event;
 import flash.net.URLRequest;
 
 public class Main extends Sprite {
  private var _loader : Loader;
  private var _player : Object;
 
  public function Main() { 
  _loader = new Loader();
  _loader.contentLoaderInfo.addEventListener(Event.INIT, _onLoaderInit, false, 0, true);
  _loader.load(new URLRequest("http://www.youtube.com/apiplayer?version=3"));
  }
 
  private function _onLoaderInit(event : Event) : void {
  _player = _loader.content; 
  _player.addEventListener("onReady", _onPlayerReady, false, 0, true);
  addChild (DisplayObject(_player));
 
  _loader.contentLoaderInfo.removeEventListener(Event.INIT, _onLoaderInit);
  _loader = null;
  }
 
  private function _onPlayerReady(event : Event) : void {
  _player.removeEventListener("onReady", _onPlayerReady);
  // Once this event has been dispatched by the player, we can use
  // cueVideoById, loadVideoById, cueVideoByUrl and loadVideoByUrl
  // to load a particular YouTube video.  
  _player.setSize(640, 360);
  _player.loadVideoById("D2gqThOfHu4");
  }
 }
}

//_loader.load(new URLRequest("http://www.youtube.com/apiplayer?version=3"));//replace this line with the following
_loader.load(new URLRequest("http://www.youtube.com/v/VIDEO_ID?version=3"));//replace VIDEO_ID with the id of the video you want to load in the previous case :"D2gqThOfHu4"
 
//also you can comment the following line if you don't want the video to start automatically:
_player.loadVideoById("D2gqThOfHu4");