Flash NetStream 接收数据但并不总是显示它

Posted 2023-02-25

【中文标题】Flash NetStream 接收数据但并不总是显示它

【英文标题】：Flash NetStream receiving data but not always displaying it

【发布时间】：2016-02-29 17:08:50

【问题描述】：

我有一个 Flash 应用程序，它连接到 EvoStream 服务器以通过 RTMP 接收视频。我从 SNC Camera Emulator 和物理相机采购视频。当我第一次启动时，物理相机会显示视频，但模拟相机不会。保持播放器运行，我关闭了 SNC 程序，然后出现了一帧视频。当我重新启动 SNC 程序时，视频现在可以在客户端正常播放。

当我打印出 NetStream.info.currentBytesPerSecond 时，无论视频是否正在播放，我都会得到类似的值。

下面是负责显示视频的客户端代码；它与Adobe提供的示例代码基本相同。

package 
import flash.display.Sprite;
import flash.events.NetStatusEvent;
import flash.events.SecurityErrorEvent;
import flash.media.Video;
import flash.net.NetConnection;
import flash.net.NetStream;
import flash.events.Event;

public class testRTMP extends Sprite 
    private var connection:NetConnection;
    private var stream:NetStream;
    private var video:Video = new Video();   
    private var sID: String;

    public function testRTMP(serverURL: String, streamId : String) 
        sID = streamId;
        connection = new NetConnection();
        connection.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
        connection.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
        connection.connect(serverURL);
    

    private function netStatusHandler(event:NetStatusEvent):void 
        switch (event.info.code) 
            case "NetConnection.Connect.Success":
                connectStream();
                break;
            case "NetStream.Play.StreamNotFound":
                trace("Stream not found: " + sID);
                break;
        
    

    private function securityErrorHandler(event:SecurityErrorEvent):void 
        trace("securityErrorHandler: " + event);
    

    private function connectStream():void 
        addChild(video);
        var stream:NetStream = new NetStream(connection);
        stream.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
        stream.client = new CustomClient();
        video.attachNetStream(stream);
        stream.play(sID);
    



class CustomClient 
public function onMetaData(info:Object):void 
    trace("metadata: duration=" + info.duration + "   framerate=" + info.framerate);

public function onCuePoint(info:Object):void 
    trace("cuepoint: time=" + info.time + " name=" + info.name + " type=" + info.type);

【参考方案1】：

尝试添加：

connection.addEventListener(AsyncErrorEvent.ASYNC_ERROR, asyncErrorHandler);
connection.client =  onBWDone: function():void ;

然后确保 onFCSubscribe 和 onBWDone 存在，因为 Flash Player 可能需要调用它们...

public function asyncErrorHandler(event:AsyncErrorEvent):void 
 trace("asyncErrorHandler.." + "\r"); 

public function onFCSubscribe (info:Object) : void
 trace("onFCSubscribe - succesful"); 

public function onBWDone (...rest) : void
 
    var p_bw:Number; 
    if (rest.length > 0)
       p_bw = rest[0]; 
    trace("bandwidth = " + p_bw + " Kbps."); 

也可以尝试删除var stream:NetStream = etc...这一行。

private function connectStream() : void 

    addChild(video);
    //var stream:NetStream = new NetStream(connection); //# Is already a (private) var...
    stream = new NetStream(connection);
    stream.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
    stream.client = new CustomClient();
    video.attachNetStream(stream);
    stream.play(sID);