Question

我正在尝试编写一个Java程序，允许一个用户充当服务器并流式传输他们的桌面（视频和音频），然后其他用户充当客户端并观看其桌面的实时流（类似于Twitch ，Webex，Skype屏幕共享等）。我正在使用VLCJ，虽然我没有承诺使用它，所以如果有更好的解决方案，我会全力以赴。这是代码，它是从我在下面提供的链接中复制的：

var product = db.Products.Where(t => t.name.Contains(productname)).FirstOrDefault();

我将“screen：//”作为参数传递给该程序。当我运行代码时，我收到此错误消息：

package test.java;

import uk.co.caprica.vlcj.discovery.NativeDiscovery;
import uk.co.caprica.vlcj.player.MediaPlayerFactory;
import uk.co.caprica.vlcj.player.headless.HeadlessMediaPlayer;
import test.java.VlcjTest;

/**
* An example of how to stream a media file over HTTP.
* <p>
* The client specifies an MRL of <code>http://127.0.0.1:5555</code>
*/
public class StreamHttp extends VlcjTest {

    //when running this it requires an MRL (Media Resource Locator)
    //fancy term for saying the file you want to stream. This could be a url to another
    //location that streams media or a filepath to a media file you want to stream
    //on the system you are running this code on.
    public static void main(String[] args) throws Exception {
        new NativeDiscovery().discover();
        if(args.length != 1) {
            System.out.println("Specify a single MRL to stream");
            System.exit(1);
        }

        //the media you are wanting to stream
        String media = args[0];
        //this is the IP address and port you are wanting to stream at
        //this means clients will connect to http://127.0.0.1:5555
        //to watch the stream
        String options = formatHttpStream("127.0.0.1", 5555);

        System.out.println("Streaming '" + media + "' to '" + options + "'");

        //this creates a the actual media player that will make calls into the native
        //vlc libraries to actually play the media you supplied. It does it in
        //a headless fashion, as you are going to stream it over http to be watched
        //instead of playing it locally to be watched.    
        MediaPlayerFactory mediaPlayerFactory = new MediaPlayerFactory(args);
        HeadlessMediaPlayer mediaPlayer = mediaPlayerFactory.newHeadlessMediaPlayer();

        //this simply starts the player playing the media you gave it
        mediaPlayer.playMedia(media, options);

        // Don't exit
        //basically you don't want the thread to end and kill the player, 
        //so it just hangs around and waits for it to end.
        Thread.currentThread().join();
    }

    private static String formatHttpStream(String serverAddress, int serverPort) {
        StringBuilder sb = new StringBuilder(60);
        sb.append(":sout=#duplicate{dst=std{access=http,mux=ts,");
        sb.append("dst=");
        sb.append(serverAddress);
        sb.append(':');
        sb.append(serverPort);
        sb.append("}}");
        return sb.toString();
    }
}

我尝试寻找解决方案，但我能找到的就是： Video Streaming in vlcj 虽然这个用户有相同的错误，但我无法从这个链接解决我的问题，虽然我确实使用了它的StreamHttp代码示例。我是一个相对缺乏经验的程序员，所以如果我错过了一个明显的解决方案，那么我道歉。我使用的是Java 1.8，Windows 7 64位。

Answer 1

你需要这样的东西：

String media = "screen://";
String[] options = {
    ":sout=#transcode{vcodec=FLV1,vb=4096,scale=0.500000}:http{mux=ffmpeg{mux=flv},dst=:5000/"
};

这里显示的关键事项是一个“sout”字符串来转码视频，然后另一个附加的“sout”字符串来流（在这种情况下通过http）。

在此示例字符串中，对于http流，仅指定端口（5000，任意选择）。没有指定主机，因此它表示localhost。你可以拥有类似“dst = 127.0.0.1：8080 /”的东西或者你需要的东西。

您必须选择/试验所需的特定转码/流媒体选项。这些选项没有一种尺寸适合所有。

足注意：

您实际上可以使用VLC本身为您生成此字符串。

启动VLC，然后选择要播放的媒体。

而不是按“播放”，而是使用小部件来选择“流”。这将打开Streaming向导，您可以在其中选择所有选项。

在向导结束时，在开始播放之前，它会显示您需要的字符串。

VLCJ中的流桌面

1 个答案: