Embedding youtube video to Flash project and Resizing it in AS3 - actionscript-3

Question

Hello i'm trying to embed a youtube video into my flash project using as3.0. So far I've been able to get the video to my frame and play it. But my stage size is 500X500. So I need my video to be width:300 and height:150. I tried changing the video size but that's not worked for me. The video has it's original embedding width and height... So how can I do that?
Here is my code.
var player:Object;
var loader:Loader = new Loader();
var context:LoaderContext = new LoaderContext();
context.checkPolicyFile = true;
context.securityDomain = SecurityDomain.currentDomain;
context.applicationDomain = ApplicationDomain.currentDomain;
loader.contentLoaderInfo.addEventListener(Event.INIT, onLoaderInit);
Security.allowDomain("www.youtube.com")
loader.load(new URLRequest("http://www.youtube.com/v/yNfkNWfH6aU?version=3"));
function onLoaderInit(event:Event):void {
addChild(loader);
loader.content.addEventListener("onReady", onPlayerReady);
loader.content.addEventListener("onError", onPlayerError);
loader.content.addEventListener("onStateChange", onPlayerStateChange);
loader.content.addEventListener("onPlaybackQualityChange", onVideoPlaybackQualityChange);
}
function onPlayerReady(event:Event):void {
// Event.data contains the event parameter, which is the Player API ID
trace("player ready:", Object(event).data);
// Once this event has been dispatched by the player, we can use
// cueVideoById, loadVideoById, cueVideoByUrl and loadVideoByUrl
// to load a particular YouTube video.
player = loader.content;
// Set appropriate player dimensions for your application
player.setSize(300, 150);
//player.x = stage.width/2; //puts the video horizontally centered
//player.y = stage.width/2; //puts the video vertically centered
//player.x=100;
//player.width=265;
//player.height=200;
}
function onPlayerError(event:Event):void {
// Event.data contains the event parameter, which is the error code
trace("player error:", Object(event).data);
}
function onPlayerStateChange(event:Event):void {
// Event.data contains the event parameter, which is the new player state
trace("player state:", Object(event).data);
}
function onVideoPlaybackQualityChange(event:Event):void {
// Event.data contains the event parameter, which is the new video quality
trace("video quality:", Object(event).data);
}