给视频加字幕

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
			   xmlns:s="library://ns.adobe.com/flex/spark"
			   xmlns:mx="library://ns.adobe.com/flex/mx"
			   backgroundColor="0"
			   viewSourceURL="srcview/index.html">
	<fx:Style>
		@namespace s "library://ns.adobe.com/flex/spark";
		@namespace mx "library://ns.adobe.com/flex/mx";
		s|Label
		{
			font-size:14;
			font-family:"Arial";
		}
	</fx:Style>
	<fx:Script>
		<![CDATA[
			import mx.events.FlexEvent;
			private var myTimer:Timer;
			
			protected function bc_creationCompleteHandler(event:FlexEvent):void
			{
				scroller.setStyle("verticalScrollPolicy", "off");
				this.myTimer=new Timer(100);
				this.myTimer.addEventListener(TimerEvent.TIMER, onChange);
				this.myTimer.start();
				
			}
			
			private function onChange(e:TimerEvent):void
			{
				var temp:Number=this.scroller.verticalScrollBar.value;
				if (temp < this.scroller.verticalScrollBar.maximum)
				{
					this.scroller.verticalScrollBar.value=this.scroller.verticalScrollBar.value + 5;
				}
				else
				{
					this.myLabel.visible=false;
					this.scroller.verticalScrollBar.value=0;
					this.myLabel.visible=true;
				}
			}
		]]>
	</fx:Script>
	<s:Group horizontalCenter="0"
			 verticalCenter="0">
		<s:VideoDisplay source="assets/s.flv"
						loop="true"
						muted="{this.myMuted.selected}"/>
		<s:BorderContainer width="200"
						   height="300"
						   right="0"
						   top="10"
						   bottom="10"
						   backgroundColor="0"
						   backgroundAlpha=".4"
						   id="bc"
						   creationComplete="bc_creationCompleteHandler(event)" borderVisible="false">
			
			<s:VGroup width="100%"
					  height="100%">
				<s:Group width="100%"
						 height="50">
					<s:CheckBox id="myMuted"
								selected="true"
								label="muted?"
								color="white"/>
				</s:Group>
				<s:Scroller width="100%"
							height="200"
							id="scroller">
					<s:Group width="200"
							 clipAndEnableScrolling="true">
						
						<s:Label color="white"
								 id="myLabel"
								 text="字幕 内容"
								 width="100%"
								 paddingLeft="10"
								 paddingRight="10"
								 paddingTop="200"
								 paddingBottom="200"/>
					</s:Group>
				</s:Scroller>
				
			</s:VGroup>
			
		</s:BorderContainer>
	</s:Group>
	
</s:Application>