关于视频播放

播放本地mp4文件

使用NetStream+Video

大致流程如下：
1. 实例化NetConnection对象，在其上添加“NetStatusEvent.NET_STATUS”事件监听，监听到“NetConnection.Connect.Success”码后做下一步。
2. 实例化NetStream对象，指定它的“client”和“videoStreamSettings”属性，在其上添加“NetStatusEvent.NET_STATUS”事件监听。在这步，NetConnection实例是NetStream构造方法的必要参数。”client”参数可以指定多个回调方法，可以处理流或者文件的信息或者状态。本示例中就在获取MP4文件后，对其文件编码格式做了检查；在视频播放完毕后，根据设置做了是否回放的操作。
3. 添加视频可视化组件到显示列表。
4. 播放视频。

关键点：
如何判断视频播放完？
虽然监听NetStream实例上的“NetStatusEvent.NET_STATUS”事件，能捕获到“NetStream.Play.Stop”状态，但此时对NetStream实例调用seek、resume等操作，程序变得不正常。正确的做法是在“client”的“onPlayStatus”回调中监听到“NetStream.Play.Complete”时，做上述操作，这样处理，视频回放自然。

<?xml version="1.0" encoding="utf-8"?><s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"                        xmlns:s="library://ns.adobe.com/flex/spark"                        xmlns:mx="library://ns.adobe.com/flex/mx"                       width="1000" height="900"                       applicationComplete="windowedapplication1_applicationCompleteHandler(event)">    <fx:Script>        <![CDATA[    import mx.events.FlexEvent;     import spark.components.VideoDisplay;    protected var _netConnection:NetConnection;    protected var _netStream:NetStream;    protected var _video:Video;    protected var _videoDisplay:VideoDisplay;    protected var _customClient:Object;    protected var _isFristInsert:Boolean = false;    protected var _isLoad:Boolean = false;    protected var _totalPosition:Number = 0;// 视频总时长    protected var _multiMediaUrl:String="C:\\\Users\\\yourname\\\Desktop\\\34A68E1A-AA4B-D2C5-59E9-BDBC18D8108E.mp4";// 视频url地址    private var _isLoop:Boolean=false;    protected function windowedapplication1_applicationCompleteHandler(event:FlexEvent):void    {        this._netConnection = new NetConnection();                this._netConnection.addEventListener(NetStatusEvent.NET_STATUS,netConnectionStatusHandler);        this._netConnection.connect(null);    }    protected function netConnectionStatusHandler(event:NetStatusEvent):void    {        if(event.info.code == "NetConnection.Connect.Success")        {            this._netConnection.removeEventListener(NetStatusEvent.NET_STATUS,netConnectionStatusHandler);                  this._customClient = new Object();            this._customClient.onMetaData = metaDataHandler;            this._customClient.onPlayStatus = playStausHandler;            this._netStream = new NetStream(this._netConnection);            this._netStream.client = this._customClient;            this._netStream.videoStreamSettings = this.h264Setting();             this._netStream.addEventListener(NetStatusEvent.NET_STATUS,netStreamStausHandler);            this._video = new Video();            if(!this._isFristInsert)            {                this._video.width = this.width;                this._video.height = this.height;            }            this._video.attachNetStream(this._netStream);            this._video.smoothing = true;            this._videoDisplay = new VideoDisplay();            this._videoDisplay.addChild(this._video);            this.addEventListener(FlexEvent.UPDATE_COMPLETE, updateCompleteLoaded);            this.videoGroup.addElement(this._videoDisplay);        }           }    private function metaDataHandler(infoObject:Object):void     {        if(this._isFristInsert)        {            try            {                if(infoObject.width >= 0)                {                }                else                {                    // 不是h264格式视频                }            }            catch(e:Error)            {                // 不是h264格式视频            }            this._isFristInsert = false;        }    this._totalPosition = infoObject.duration;    }    private function playStausHandler(e:Object):void    {        trace("playStausHandler:"+e.code);        if(e.code== "NetStream.Play.Complete")        {            // 播放到最末端            this._netStream.seek(0);            this._netStream.pause();            // 如果需要循环播放，则从头开始播放            if(_isLoop)            {                this._netStream.resume();            }        }    }    protected function h264Setting():H264VideoStreamSettings    {        var h264Settings:H264VideoStreamSettings = new H264VideoStreamSettings();        h264Settings.setProfileLevel(H264Profile.MAIN,H264Level.LEVEL_5_1);        h264Settings.setMode(1280,720,24);        h264Settings.setQuality(0,80);        return h264Settings;    }    protected function netStreamStausHandler(evt:NetStatusEvent):void    {        trace(evt.info.code);        if(evt.info.code == "NetStream.Play.Start")        {        }        else if(evt.info.code == "NetStream.Play.StreamNotFound")        {        }    }    protected function updateCompleteLoaded(event:FlexEvent):void    {        if(this._netStream)        {            this._netStream.play(this._multiMediaUrl);            this._netStream.bufferTime = 5;            this.removeEventListener(FlexEvent.UPDATE_COMPLETE, updateCompleteLoaded);            //this._isLoadVideoComplete = true;        }    }    protected function button1_clickHandler(event:MouseEvent):void    {        this._netStream.togglePause();    }    protected function checkbox1_changeHandler(event:Event):void    {        // TODO Auto-generated method stub        this._isLoop=!this._isLoop;    }    ]]>    </fx:Script>    <s:VGroup width="100%" height="100%">        <s:HGroup width="100%" height="60">            <s:Button label="播放/暂停"  click="button1_clickHandler(event)"/>            <s:CheckBox label="是否循环播放" change="checkbox1_changeHandler(event)"/>        </s:HGroup>        <s:Spacer height="30"/>        <s:HGroup id="videoGroup" width="100%" height="600">        </s:HGroup>    </s:VGroup></s:WindowedApplication>

videoPlayer

使用mx VideoDisplay

某些flv视频是flv1.0格式，无法取得总时长（totalTime），如果自己写进度条需要注意了。