I'm using vlcj to play video, but the video doesn't display on some computers(i tested in 4 and worked on 2, all windows), on 1 it displays the button but not the video and on the other it just display a gray background without the button. I tested .wmv and .avi files. I'm using the following code:

public class Video extends JFrame implements WindowListener{    
private JPanel contentPane;
private JButton btnClose;

private Dimension size;

private float aspectRatio;

private EmbeddedMediaPlayer mediaPlayer;

public Video()
{
    try
    {
        size = Toolkit.getDefaultToolkit().getScreenSize();
        aspectRatio = (float)size.width/size.height;

        String file = "...";

        btnClose = new JButton("X");
        btnClose.addActionListener(new ActionListener()
        {...});

        btnClose.setBounds(640 - 50, 10, 40, 40);
        setBounds(size.width/2 - 320, (int)(size.height - 40*aspectRatio) - 250, 640, 200);

        contentPane = new JPanel();
        contentPane.setLayout(null);

        setContentPane(contentPane);

        WindowsCanvas surface = new WindowsCanvas();

        contentPane.setBounds(0, 0, 640, 200);
        surface.setBounds(0, 0, 640, 200);

        MediaPlayerFactory factory = new MediaPlayerFactory(new String("--no-video-title-show"));
        mediaPlayer = factory.newEmbeddedMediaPlayer();

        surface.addMouseListener(new MouseListener()
        {...});

        contentPane.add(btnClose);
        contentPane.add(surface);

        setVisible(true);
        mediaPlayer.setVideoSurface(factory.newVideoSurface(surface));

        mediaPlayer.setRepeat(true);
        mediaPlayer.playMedia(file);
    }
    catch(Exception e)
    {

    }
}}