我正在尝试在JPanel中使用vlcj播放视频,但它对我不起作用。我得到的消息异常是“java.lang.IllegalStateException:视频表面组件必须是可显示的”,这与Keep getting an Error "Component must be displayable"中的问题相同。
包含画布和vlcj播放器的JPanel代码是:
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,只包含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);
}
}
提前致谢。
答案 0 :(得分:6)
您尝试在包含画布的帧设置为可见之前播放媒体。您需要将playMedia()
调用放在一个单独的方法中,并在创建整个框架并将其设置为可见后将其称为。
编辑:
如果您仍希望直接播放,请在创建框架后调用相关方法:
MyJFrame frame = new MyJFrame();
frame.setVisible(true);
frame.startPlaying();
...显然你需要在MyJFrame上定义startPlaying()
,但它应该直接开始播放。你只需要先将框架设置为可见。