javafx UNKNOWN duration on Media object

Question

I am a newbie to both Java and JavaFX, I\'ve spent the last couple years developing on Python with QT, and I am now developing in Java and JavaFX.

I am developing a

Answer 1

If you read the javadoc for Media class, it says you should wait for the media player to be ready:

The media information is obtained asynchronously and so not necessarily available immediately after instantiation of the class. All information should however be available if the instance has been associated with a MediaPlayer and that player has transitioned to Status.READY status

So you just need to create an instance of MediaPlayer and listen for the Status.READY:

    File filestring = new File("my/file/dir/file.mp3");
    Media file = new Media(filestring.toURI().toString());  

    MediaPlayer mediaPlayer = new MediaPlayer(file);

    mediaPlayer.setOnReady(new Runnable() {

        @Override
        public void run() {

            System.out.println("Duration: "+file.getDuration().toSeconds());

            // display media's metadata
            for (Map.Entry<String, Object> entry : file.getMetadata().entrySet()){
                System.out.println(entry.getKey() + ": " + entry.getValue());
            }

            // play if you want
            mediaPlayer.play();
        }
    });

Answer 2

It looks like the Media needs some time to get fully initialized. Add a Thread sleep beforebthe getDuration line and try again!