Flex 连接FMS解决方法

Flex 连接FMS
Flex 4.5
FMS4.5
安装完成之后，想播放下FMS application目录下vod中的 sample.flv(具体路径为Flash Media Server 4.5\applications\vod\media\sample.flv)
怎么都播放不了，是不是少了哪步设置？

XML code

    <fx:Script>        <![CDATA[            import mx.controls.Alert;                        private var nc:NetConnection;            private var ns:NetStream;                        protected function button1_clickHandler(event:MouseEvent):void            {                nc = new NetConnection();                nc.addEventListener(NetStatusEvent.NET_STATUS,netStatus);                nc.connect("rtmp://localhost:1935/vod");            }                        private function netStatus(e:NetStatusEvent):void            {                Alert.show(e.info.code);                if(e.info.code == "NetConnection.Connect.Success")                {//                    Alert.show("Net Success!");                    ns = new NetStream(nc);                    ns.play("sample.flv");                    var video:Video = new Video();                    video.attachNetStream(ns);                    videoDis.addChild(video);                }            }                        protected function button2_clickHandler(event:MouseEvent):void            {                this.videoDis.source = "rtmp://localhost:1935/vod/media/sample.flv";            }                    ]]>    </fx:Script>        <s:VideoDisplay id="videoDis" x="10" y="10" width="380" height="241" autoPlay="true"/>    <s:Button x="23" y="259" label="获取" click="button1_clickHandler(event)"/>    <s:Button x="121" y="259" label="按钮" click="button2_clickHandler(event)"/>