vlcj 中的视频流

Question

我想将视频从服务器流式传输到客户端。我找到了将视频从服务器流式传输到客户端的代码，但运行时出错：

Streaming 'vlcj-speed-run.flv' to  ':sout=#duplicate{dst=std{access=http,mux=ts,dst=127.0.0.1:5000}}'

[018ec020] access_output_http access out: Consider passing --http-host=IP on the command line instead.

[018b4978] main mux error: cannot add this stream

[05493078] main decoder error: cannot create packetizer output (FLV1)

Answer 1

我认为您正在使用旧示例，实际上我认为您正在使用旧测试用例。 vlcj 项目已从 googlecode 移至 github。因此，您很可能使用的是旧版本的库。

其次，如果您查看编写库的人的Part 2，我认为它会为您解决一些问题。本质上，在大多数情况下，您应该使用 EmbeddedMediaPlayerComponent，在这种情况下，您可以将 url 传递给流或将文件路径传递给要播放的本地文件。

我在下面包含了第 2 部分的源代码：

import uk.co.caprica.vlcj.binding.LibVlc;
import uk.co.caprica.vlcj.component.EmbeddedMediaPlayerComponent;
import uk.co.caprica.vlcj.runtime.RuntimeUtil;

import com.sun.jna.NativeLibrary;
public class Tutorial2B {

  private final EmbeddedMediaPlayerComponent mediaPlayerComponent;

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        new Tutorial2B(args);
      }
    });
  }

  private Tutorial2B(String[] args) {
    JFrame frame = new JFrame("vlcj Tutorial");

    mediaPlayerComponent = new EmbeddedMediaPlayerComponent();

    frame.setContentPane(mediaPlayerComponent);

    frame.setLocation(100, 100);
    frame.setSize(1050, 600);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);

    mediaPlayerComponent.getMediaPlayer().playMedia(args[0]);
  }
}

---

StreamHttp.java的解释

import uk.co.caprica.vlcj.player.MediaPlayerFactory;
import uk.co.caprica.vlcj.player.headless.HeadlessMediaPlayer;
import uk.co.caprica.vlcj.test.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 {
        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();
    }
}