视频无法循环播放或重复播放（vlcj-java）

Question

我在我的 java 程序中使用 vlcj。我需要反复播放视频。我用过 setRepeat(true);但这对我不起作用。这是循环视频的其他方法吗？还是我做错了？请帮我。非常感谢。

 public QueueMonitor() {
                    
        initComponents();
         
        //VIDEO
        chargerLibrairie();

        Canvas c = new Canvas();
        panel.add(c);
        MediaPlayerFactory mediaPlayerFactory = new MediaPlayerFactory();
        //Create a media player instance
        EmbeddedMediaPlayer mediaPlayer = mediaPlayerFactory.newEmbeddedMediaPlayer();
        mediaPlayer.setVideoSurface(mediaPlayerFactory.newVideoSurface(c));
        
        mediaPlayer.playMedia("Ospital1.mp4");
        mediaPlayer.setRepeat(true);
        mediaPlayer.setPlaySubItems(true);

       
    }


    public static void chargerLibrairie(){
        NativeLibrary.addSearchPath(
        RuntimeUtil.getLibVlcLibraryName(), "C:/Program Files/VideoLAN/VLC");
        Native.loadLibrary(RuntimeUtil.getLibVlcLibraryName(), LibVlc.class);
        LibXUtil.initialise();
    }

另外，如何在程序运行时设置暂停、播放、降低音量等功能？就像普通的视频播放器一样。

Answer 1

这里有一些关于如何使用 vlcj 进行重复播放的最小示例。

对于当前版本的 vlcj、4.x 及更高版本：

// vlcj 4.x+
public class RepeatPlayer {

    public static void main(String[] args) throws Exception {
        String mrl = "some-cool-video.mp3";

        EmbeddedMediaPlayerComponent mediaPlayerComponent = new EmbeddedMediaPlayerComponent();

        JFrame f = new JFrame("Repeat Player");
        f.setSize(800, 600);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                mediaPlayerComponent.release();
            }
        });
        f.setContentPane(mediaPlayerComponent);
        f.setVisible(true);

        mediaPlayerComponent.mediaPlayer().controls().setRepeat(true);

        mediaPlayerComponent.mediaPlayer().media().play(mrl);

        Thread.currentThread().join();
    }
}

由于您使用的是旧版本的 vlcj，因此以前是这样完成的：

// vlcj 3.12.1
public class RepeatPlayer {

    public static void main(String[] args) throws Exception {
        String mrl = "some-cool-video.mp3";

        final EmbeddedMediaPlayerComponent mediaPlayerComponent = new EmbeddedMediaPlayerComponent();

        JFrame f = new JFrame("Repeat Player");
        f.setSize(800, 600);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                mediaPlayerComponent.release();
            }
        });
        f.setContentPane(mediaPlayerComponent);
        f.setVisible(true);

        mediaPlayerComponent.getMediaPlayer().setRepeat(true);

        mediaPlayerComponent.getMediaPlayer().playMedia(mrl);

        Thread.currentThread().join();
    }
}

---

因此，至少在重复播放功能方面，原始问题中的代码大体上是正确的。原始代码最可能的问题是媒体播放器由于未能保存对象引用而被垃圾回收。

Answer 2

public class Video extends javax.swing.JPanel
{

  private EmbeddedMediaPlayerComponent video;
  private EmbeddedMediaPlayer mediaPlayer;
 
 public Video()
  {
    initComponents();
    initVideo();
  }

  private void initVideo()
  {
    video = new EmbeddedMediaPlayerComponent()
    {
      @Override
      public void finished(MediaPlayer mediaPlayer)
      {
        super.finished(mediaPlayer);
        System.out.println("FINISHED");
        new Thread(() -> {
          System.gc();
          mediaPlayer.controls().setTime(0);
          mediaPlayer.controls().play();
        }).start();
      }
    };
    mediaPlayer = video.mediaPlayer();
    mediaPlayer.input().enableKeyInputHandling(false);
    mediaPlayer.input().enableMouseInputHandling(false);
    add(video, BorderLayout.CENTER);

  }
  public void start(String path)
  {
    mediaPlayer.media().prepare(path);
    mediaPlayer.controls().play();
  }
  public void stop()
  {
    mediaPlayer.controls().stop();
    mediaPlayer.release();
    video.release();
  }
  @SuppressWarnings("unchecked")
  private void initComponents()
  {
    setLayout(new java.awt.BorderLayout());
  }
 }