Looping a sound with either javafx.scene.media.MediaPlayer or javafx.scene.media.AudioClip results in a clicking artefact making JFX audio unusable for things like background sounds in games or music.

Two reproducible test cases attached. The file contains a test signal (perfect sine wave at 1 kHz) and loops perfectly.

import javafx.application.Application;
import javafx.scene.media.AudioClip;
import javafx.stage.Stage;

/**
 * Simple audio loop
 */
public class AudioClipLoopTest extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        // download at https://www.dropbox.com/s/yagu1vsboqh0fv5/sinewave1s.wav
        final AudioClip clip = new AudioClip("file:" + System.getProperty("user.home") + "/tmp/sinewave1s.wav");
        clip.setCycleCount(AudioClip.INDEFINITE);
        clip.play();
    }

    public static void main(String[] args){
        launch(args);
    }
}

The same with MediaPlayer:

import javafx.application.Application;
import javafx.scene.media.AudioClip;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.stage.Stage;

/**
 * Simple audio loop
 */
public class MediaPlayerAudioLoopTest extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        // download at https://www.dropbox.com/s/yagu1vsboqh0fv5/sinewave1s.wav
        final Media media = new Media("file:" + System.getProperty("user.home") + "/tmp/sinewave1s.wav");
        final MediaPlayer player = new MediaPlayer(media);
        player.setCycleCount(AudioClip.INDEFINITE);
        player.setOnReady(()->player.play());
    }

    public static void main(String[] args){
        launch(args);
    }
}

In addition to that the MediaPlayer stops looping after 6 cycles, maybe related to RT-40409.

I have not found a workaround, so if I do not use native frameworks directly or use a framework like libgdx, I cannot continue with my application.