Question

我试图在JPanel内部播放使用vlcj的录像,但我没有工作。我获得的信息例外是“java.lang.IllegalStateException: 视频表面成分必须显示”,这与。

The Code of the JPanel which includes the canvas and the vlcj role 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 扩展了JFrame,只包括MyJPanel JPanel。我认为这根本不重要。

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);
}   
}

提前感谢。

Answer 1

你在发现含有信道的画面之前,试图发挥媒体的作用。您需要将<条码>Media()以单独的方法发出,并将其称作<>>>>整个框架已经建立并明确。

EDIT:

如果你仍然想直截了当,就在你创建并显示你的框架之后,就把相关方法称为:

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.

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