Occasional hang happens sometimes while seeking in a video.

The MediaPlayer sometimes hangs with the following (partial) stack trace:

JavaFX Application Thread" #12 daemon prio=5 os_prio=31 tid=0x00007fff28993800 nid=0xa0b runnable [0x00007fff5686a000] java.lang.Thread.State: RUNNABLE at
com.sun.media.jfxmediaimpl.platform.osx.OSXMediaPlayer.osxGetDuration(Native Method) at
com.sun.media.jfxmediaimpl.platform.osx.OSXMediaPlayer.playerGetDuration(OSXMediaPlayer.java:144) at
com.sun.media.jfxmediaimpl.NativeMediaPlayer.getDuration(NativeMediaPlayer.java:1160)
at javafx.scene.media.MediaPlayer.seek(MediaPlayer.java:1386)
- locked <0x00000007934f60f0> (a java.lang.Object)