Trying to embed vlcj media player in a WindowsCanvas inside a JPanel

问题

I'm trying to play a video using vlcj inside a JPanel but it doesn't work for me. The message exception I am getting is "java.lang.IllegalStateException: The video surface component must be displayable" which is the same problem as in Keep getting an Error "Component must be displayable".

The code of the JPanel which contains the canvas and the vlcj player is this:

import javax.swing.JPanel;

import com.sun.jna.Native;
import com.sun.jna.NativeLibrary;

import java.awt.Canvas;
import java.awt.Color;

import uk.co.caprica.vlcj.binding.LibVlc;
import uk.co.caprica.vlcj.player.MediaPlayerFactory;
import uk.co.caprica.vlcj.player.embedded.EmbeddedMediaPlayer;
import uk.co.caprica.vlcj.player.embedded.videosurface.CanvasVideoSurface;
import uk.co.caprica.vlcj.runtime.RuntimeUtil;
import uk.co.caprica.vlcj.runtime.windows.WindowsCanvas;

public class MyJPanel extends JPanel {
private EmbeddedMediaPlayer player;
private WindowsCanvas canvas;

public MyJPanel() {
    canvas = new WindowsCanvas();
    add(canvas);
    revalidate();
    repaint();

    canvas.setVisible(true);

    MediaPlayerFactory mediaPlayerFactory = new MediaPlayerFactory();
    player = mediaPlayerFactory.newEmbeddedMediaPlayer();

    CanvasVideoSurface videoSurface = mediaPlayerFactory.newVideoSurface(canvas);

    player.setVideoSurface(videoSurface);
    player.playMedia("v.avi");   // This sentence throws the exception.
}
}

MyJFrame extends JFrame and only contains the MyJPanel JPanel. I think it's not important at all.

import javax.swing.JFrame;

public class MyJFrame extends JFrame {
protected MyJPanel myJPanel;

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                MyJFrame frame = new MyJFrame();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

public MyJFrame() {
    myJPanel = new myJPanel();
    add(myJPanel);
}   
}

Thanks in advance.

回答1:

You're trying to play the media before the frame containing the canvas has been set to be visible. You'll need to put the playMedia() call in a separate method, and call it after the entire frame has been created and set as visible.

EDIT:

If you still want it to play straight off, just call the relevant method after you've created and made your frame visible:

MyJFrame frame = new MyJFrame();
frame.setVisible(true);
frame.startPlaying();

...obviously you'll need to define startPlaying() on MyJFrame, but then it should start playing straight off. you just need to set the frame visible first.

来源：https://stackoverflow.com/questions/10609338/trying-to-embed-vlcj-media-player-in-a-windowscanvas-inside-a-jpanel

标签

java

video

jpanel

vlcj