JavaFx- MediaView не отображает видео

Question

selectFile.setOnAction(новый EventHandler() {

      @Override
public void handle(ActionEvent event) {

FileChooser chooser = новый FileChooser();

          chooser.getExtensionFilters().add("select (*mp4)", "*.mp4");
    
    try {
        fileToPlay = fileChooser.showOpenDialog(null);
        Media m = new Media(fileToPlay.toURI().toString());
        MediaPlayer mp = new MediaPlayer(m);
        mediaPlayer.setMediaPlayer(mp);
        mp.play();

    } catch (IOException ex) {
        System.out.println(ex.getMessage());
    }
}

});