An example showing how to use "callback" media to read media data from an InputStream. This is NOT recommended and has severe, often critical, limitations. Working with a MemoryMappedByteBuffer would be better.

MinimalMediaCallbackTest.java

import uk.co.caprica.vlcj.factory.MediaPlayerFactory;
import uk.co.caprica.vlcj.media.callback.CallbackMedia;
import uk.co.caprica.vlcj.media.callback.nonseekable.NonSeekableInputStreamMedia;
import uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent;

import javax.swing.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.io.InputStream;

public class MinimalMediaCallbackTest {

    public static void main(String[] args) throws Exception {
        final EmbeddedMediaPlayerComponent mediaPlayerComponent = new EmbeddedMediaPlayerComponent();

        JFrame f = new JFrame("Test Player");
        f.setSize(800, 600);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                mediaPlayerComponent.release();
            }
        });
        f.setContentPane(mediaPlayerComponent);
        f.setVisible(true);

        CallbackMedia media = new NonSeekableInputStreamMedia() {
            @Override
            protected InputStream onOpenStream() throws IOException {
                // Get your input stream to read from here...
                return null;
            }

            @Override
            protected void onCloseStream(InputStream inputStream) throws IOException {
                inputStream.close();
            }

            @Override
            protected long onGetSize() {
                return 0;
            }
        };

        mediaPlayerComponent.mediaPlayer().media().play(media);

        Thread.currentThread().join();
    }
}