*** セキュリティ Sandbox 違反 ***
SecurityDomain 'http://s.ytimg.com/yt/swf/~~~~~~~~~~~.swf' が互換性のないコンテキスト 'http://www.youtube.com/cp/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=?version=3&enablejsapi=1' にアクセスを試みました。

Security.allowDomain("http://www.youtube.com/");
Security.loadPolicyFile("http://www.youtube.com/crossdomain.xml");

var player:Object;
var loader:Loader = new Loader();
var request:URLRequest = new URLRequest("http://www.youtube.com/cp/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=?version=3&enablejsapi=1");
loader.contentLoaderInfo.addEventListener(Event.INIT, onLoaderInit);
loader.load(request);

function onPlayerReady(event:Event):void
{
	player = loader.content;
	var playerwidth;
	playerwidth = 352;
	player.setSize(playerwidth,playerwidth/16*9+32 );
	player.cueVideoById(parentMc.video_id, 0, "medium");
}


function onLoaderInit(event:Event):void
{
	loader.content.addEventListener("onReady", onPlayerReady);
	loader.content.addEventListener("onPlaybackQualityChange",onVideoPlaybackQualityChange);
	addChild(loader);
}


function onVideoPlaybackQualityChange(event:Event):void
{
	player.setPlaybackQuality("medium");
	// Event.data contains the event parameter, which is the new video quality;
	trace("video quality:", Object(event).data);
}