VLCJ视频未显示，但听到视频声音

Question

当应用程序运行时，可以听到声音，并且其他按钮控件在帧上可见，但包含视频的面板不会显示任何黑屏，也不会显示在帧上。

public class MediaPlayer extends JPanel {
private JFrame ourframe = new JFrame();
//Declares our media player component
private EmbeddedMediaPlayerComponent mediaplayer;
//This string holds the media URL path
private String mediapath = "";
//This string holds the vlc URL path
private final String vlcpath = "C:\Program Files (x86)\VideoLAN\VLC";
private JPanel panel, panel2;
private JButton play_btn, stop_btn, foward_btn, rewind_btn, enlarge_btn;
private JSlider timeline;
public MediaPlayer(String mediapath) {
    this.mediapath = mediapath;
    NativeLibrary.addSearchPath(RuntimeUtil.getLibVlcLibraryName(), vlcpath);
    mediaplayer = new EmbeddedMediaPlayerComponent();
    panel = new JPanel();
    panel.setLayout(new BorderLayout());
    panel.add(mediaplayer, BorderLayout.CENTER); //panel containing the video
    play_btn = new JButton("play");
    stop_btn = new JButton("stop");
    foward_btn = new JButton("ff");
    rewind_btn = new JButton("rew");
    enlarge_btn = new JButton("enlarge");
    timeline = new JSlider(0, 100, 0);
    timeline.setMajorTickSpacing(10);
    timeline.setMajorTickSpacing(5);
    timeline.setPaintTicks(true);
    panel2 = new JPanel();
    panel2.setLayout(new FlowLayout(FlowLayout.CENTER));
    panel2.add(play_btn);
    panel2.add(stop_btn);
    panel2.add(foward_btn);
    panel2.add(rewind_btn);
    panel2.add(enlarge_btn);
    panel2.add(timeline);
    panel.add(panel2, BorderLayout.SOUTH);
    add(panel);
}
public void play() {
    mediaplayer.getMediaPlayer().playMedia(mediapath);
}
public static void main(String[] args) {
    //Declare and initialize local variables
    String mediaPath = "";
    mediaPath = "C:\Users\goldAnthony\Desktop\Videos\Whistle.mp4";
    //creates instances of the VlcPlayer object, pass the mediaPath and invokes the method "run"
    MediaPlayer mediaplayer = new MediaPlayer(mediaPath);
    JFrame ourframe = new JFrame();
    ourframe.setContentPane(mediaplayer);
    ourframe.setSize(720, 560);
    ourframe.setVisible(true);
    mediaplayer.play();
    ourframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}

Answer 1

这是因为

您将视频图面添加到 JPanel 时没有选择合适的布局管理器。

默认情况下，JPanel 有一个 FlowLayout，这将根据组件的首选大小布局组件。

视频表面面板未设置首选大小。

解决方案是在主面板上设置一个布局管理器，如BorderLayout。

所以在你的构造函数结束时，而不是这个...

add(panel);

。这样做...

setLayout(new BorderLayout());
add(panel, BorderLayout.CENTER);

交叉发布在 [1]。

[1] https://groups.google.com/forum/#!topic/vlcj-users/m0zG-fx4qm8