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  1. JDK
  2. JDK-8305842

Video sometimes does not start when reinitializing in Windows 11

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    • x86_64
    • windows

    Description

      ADDITIONAL SYSTEM INFORMATION :
      Windows 11 (Version 10.0.22621) (Windows 11 was not an option in the form so I picked 10 instead)
      Oracle JDK 19 (build 19.0.2+7-44)

      A DESCRIPTION OF THE PROBLEM :
      When using a MediaPlayer and it is disposed and replaced repeatedly it sometimes does not start playing. There are no error logs even with `javafx.verbose=true`. The only logs I see is on startup where it loads DLL files from resources rather than from ".m2/repository". I am pretty sure this issue arose after I switched to Windows 11.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run the code pasted in "Source code for an executable test case". It expects a resource file called "video.mp4". I recommend testing with a small video. Main#start() initializes JFX and the player. Main#reinit() is called twice per second and disposes the old player and creates a new one. After 3-10 restarts the video never starts playing and it will print "stuck!" repeatedly. If I remove the stuck check and let it keep reinitializing, it will start working again.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      The video should keep restarting forever.
      ACTUAL -
      After a few restarts, nothing happens. The screen is white and the video never starts.

      ---------- BEGIN SOURCE ----------
      package org.example;

      import javafx.embed.swing.JFXPanel;
      import javafx.scene.Scene;
      import javafx.scene.layout.StackPane;
      import javafx.scene.media.Media;
      import javafx.scene.media.MediaPlayer;
      import javafx.scene.media.MediaView;

      import javax.swing.*;
      import java.awt.*;
      import java.awt.event.ActionEvent;
      import java.awt.event.ActionListener;
      import java.io.File;

      public class Main implements ActionListener {

          private Timer timer = new Timer(500, this);
          private MediaView viewer;
          private boolean prevStarted = true;

          public static void main(String[] args) {
              new Main().start();
          }

          private void start() {
              SwingUtilities.invokeLater(() -> {
                  JFrame frame = new JFrame("FrameDemo");

                  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                  JFXPanel jfxPanel = new JFXPanel();

                  frame.setMinimumSize(new Dimension(500, 500));
                  frame.add(jfxPanel);

                  frame.pack();

                  frame.setVisible(true);

                  viewer = new MediaView();
                  viewer.setFitWidth(500);
                  viewer.setFitHeight(500);
                  viewer.setPreserveRatio(true);

                  StackPane pane = new StackPane();
                  pane.getChildren().add(viewer);

                  jfxPanel.setScene(new Scene(pane, 500, 500));
                  timer.setInitialDelay(100);
                  timer.start();
              });
          }

          private void reinit() {
              if (!prevStarted) {
                  System.out.println("stuck!");
                  return;
              }
              prevStarted = false;
              MediaPlayer oldPLayer = viewer.getMediaPlayer();
              if (oldPLayer != null) {
                  oldPLayer.dispose();
              }

              MediaPlayer newPlayer = new MediaPlayer(new Media(new File("src/main/resources/video.mp4").toURI().toString()));
              newPlayer.setVolume(0);
              newPlayer.setOnPlaying(() -> {
                  prevStarted = true;
              });
              newPlayer.play();

              viewer.setMediaPlayer(newPlayer);
          }

          @Override
          public void actionPerformed(ActionEvent e) {
              reinit();
          }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Detect somehow that OnPlaying is never executed within x ms. If it has not started within that timeframe, replace the MediaPlayer and dispose the old one.

      FREQUENCY : often


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              almatvee Alexander Matveev
              webbuggrp Webbug Group
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                Created:
                Updated: