HTML5 VIDEO tag with FLV6 video doesn't work on Linux; an exception is thrown when trying to start playing video:

Exception in thread "JavaFX Application Thread" java.lang.IllegalThreadStateException
at java.lang.Thread.start(Thread.java:682)
at com.sun.webpane.sg.prism.WCMediaPlayerImpl.prepareToPlay(WCMediaPlayerImpl.java:205)
at com.sun.webpane.platform.graphics.WCMediaPlayer.fwkPrepareToPlay(WCMediaPlayer.java:270)
at com.sun.webpane.platform.WebPage.twkProcessMouseEvent(Native Method)
at com.sun.webpane.platform.WebPage.dispatchMouseEvent(WebPage.java:768)
at javafx.scene.web.WebView.processMouseEvent(WebView.java:590)
at javafx.scene.web.WebView.access$300(WebView.java:57)
at javafx.scene.web.WebView$11.handle(WebView.java:678)
at javafx.scene.web.WebView$11.handle(WebView.java:676)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:56)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:162)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:115)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$MouseHandler.process(Scene.java:2893)
at javafx.scene.Scene$MouseHandler.process(Scene.java:2687)
at javafx.scene.Scene$MouseHandler.access$1300(Scene.java:2653)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1279)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:1911)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:204)
at com.sun.glass.ui.View.handleMouseEvent(View.java:290)
at com.sun.glass.ui.View.notifyMouse(View.java:567)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication$1$1.run(GtkApplication.java:36)
at java.lang.Thread.run(Thread.java:722)