[AS3]as3中Err:flash.net.NetStream 无法调用回调onMetaData

[AS3]as3中Err:flash.net.NetStream 无法调用回调onMetaData

import flash.media.*; 
var videoURL:String = "full.flv"; 
var videoConnection:NetConnection; 
var videoStream:NetStream;        
var video:Video; 
//CuPlayer.com提示：创建回调函数的对象 
var customClient:Object = new Object(); 
customClient.onMetaData = metaDataHandler; 
 
loadMv(); 
 
//CuPlayer.com提示：加载影片 
function loadMv():void{ 
videoConnection = new NetConnection(); 
videoConnection.connect(null); 
videoStream = new NetStream(videoConnection); 
videoStream.client = customClient; 
 
video = new Video(); 
flvMc.addChild(video); 
video.attachNetStream(videoStream); 
video.width=1024; 
video.height=768; 
video.x=0; 
video.y=0; 
videoStream.play(videoURL); 
} 
//CuPlayer.com提示：onMetaData回调函数的事件 
function metaDataHandler(infoObject:Object):void {}