How to rotate a video placed on a JFrame (VLCJ)?

Question

I am wondering if it is possible to rotate 90 degrees a video played with VLCJ. Part of the code used for displaying the video is the following:

        mediaPlayerFactory = new MediaPlayerFactory();     

        mediaPlayer = mediaPlayerFactory.newEmbeddedMediaPlayer();

        frame.setResizable(false);  
        frame.setUndecorated(true);

        Canvas c = new Canvas();
        c.setBackground(Color.black);
        final JPanel p = new JPanel();

        p.setLayout(new BorderLayout());

        p.add(c, BorderLayout.CENTER);
        frame.add(p, BorderLayout.CENTER);

        mediaPlayer.setVideoSurface(mediaPlayerFactory.newVideoSurface(c));

        frame.setLocation(650, 200);
        frame.setSize(1050, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);             

        mediaPlayer.playMedia(file);
        mediaPlayer.mute(false);

The code works nicely, the video can be watched without problems, but I would like to perform a rotation on it. I have looked up on the Internet but most of the posts are about rotation of images... so anyone can help me with that? Thank you!

Answer 1

When you create the MediaPlayerFactory, make sure to specify the video filter and options you want as factory arguments, for example:

String[] args = {
    "--video-filter", 
    "rotate",
    "rotate-angle",
    "10"
};

mediaPlayerFactory = new MediaPlayerFactory(args);

I don't think there's any way to set this dynamically while the video is playing.

The available filters come from:

$vlc --list

The available options come from:

$vlc -H

Alternatively, you could use a DirectMediaPlayer where you render the video yourself into a Graphics2D or OpenGL or whatever context and apply whatever rotation/transformation you want.