How to unload audio when a video is deleted - actionscript-3

Question

I've created a video player into which I dynamically load video from another component:
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()" >
<mx:Script>
<![CDATA[
[Bindable] public var videoAddress:String
private static const YOUTUBE_EMBED_URL:String = "http://www.youtube.com/v/";
[Bindable] public var videoUrl:String;
private function init():void {
videoUrl = YOUTUBE_EMBED_URL+videoAddress;
}
]]>
</mx:Script>
<mx:SWFLoader id="swfLoader" source="{videoUrl}" width="800" height="600" />
</mx:Canvas>
Here's how I load the video:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" minWidth="955" minHeight="600">
<mx:Script>
<![CDATA[
private var videoPlayer:VideoPlayer;
protected function button1_clickHandler(event:MouseEvent):void{
if(this.videoPlayer != null){
this.videoPlayer.removeAllChildren();
}
videoPlayer = new VideoPlayer();
videoPlayer.videoAddress = "_OBlgSz8sSM";
this.addChild(videoPlayer);
}
protected function button2_clickHandler(event:MouseEvent):void{
if(this.videoPlayer != null){
this.videoPlayer.removeAllChildren();
}
videoPlayer = new VideoPlayer();
videoPlayer.videoAddress = "tvmIEP_BP9Q";
this.addChild(videoPlayer);
}
]]>
</mx:Script>
<mx:HBox top="600">
<mx:Button label="Button 1" click="button1_clickHandler(event)" />
<mx:Button label="Button 2" click="button2_clickHandler(event)" />
</mx:HBox>
</mx:Application>
The problem I'm experiencing is that when I load another video, the old video is removed and the new video loads, but the old audio keeps playing.
How can I remove the audio?

Answer 1

I read a post that discussed garbage collection
The solution for me was to add the following to the init() function:
SoundMixer.stopAll();