8.0b104:

Creating media
Exception in thread "Thread-4" MediaException: UNKNOWN : com.sun.media.jfxmedia.MediaException: Could not create player! : com.sun.media.jfxmedia.MediaException: Could not create player!
at javafx.scene.media.MediaException.exceptionToMediaException(MediaException.java:146)
at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:503)
at javafx.scene.media.MediaPlayer.<init>(MediaPlayer.java:412)
at helloworld.HelloMediaThread$1.run(HelloMediaThread.java:39)
at java.lang.Thread.run(Thread.java:724)
Caused by: com.sun.media.jfxmedia.MediaException: Could not create player!
at com.sun.media.jfxmediaimpl.NativeMediaManager.getPlayer(NativeMediaManager.java:225)
at com.sun.media.jfxmedia.MediaManager.getPlayer(MediaManager.java:104)
at javafx.scene.media.MediaPlayer.init(MediaPlayer.java:460)
... 3 more

on app:

private static final String source = "file:C:/PeperamiAdvert.mp4";
                System.err.println("Creating media");
                final Media media = new Media(source);
                final MediaPlayer mediaPlayer = new MediaPlayer(media);

win7, b64