NPE in movie service

2014-10-28 22:06:46,681 [ajp-apr-8026-exec-13] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N26-E296 ^%^ org.olat.core.logging
Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko
**RedScreen**
>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:116)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:57)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:46)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:212)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:269)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:198)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
   at org.olat.core.servlets.OpenOLATServlet.service(OpenOLATServlet.java:155)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.jcodec.api.FrameGrab.decodeLeadingFrames(FrameGrab.java:176)
   at org.jcodec.api.FrameGrab.<init>(FrameGrab.java:73)
   at org.jcodec.api.FrameGrab.getFrame(FrameGrab.java:337)
   at org.olat.core.commons.services.video.MovieServiceImpl.generateThumbnail(MovieServiceImpl.java:110)
   at org.olat.core.commons.services.thumbnail.impl.ThumbnailServiceImpl.generateThumbnail(ThumbnailServiceImpl.java:82)
   at org.olat.core.commons.modules.bc.meta.MetaInfoFileImpl.getThumbnailInfo(MetaInfoFileImpl.java:866)
   at org.olat.core.commons.modules.bc.meta.MetaInfoFileImpl.getThumbnail(MetaInfoFileImpl.java:810)
   at org.olat.core.commons.modules.bc.commands.CmdServeThumbnailResource.execute(CmdServeThumbnailResource.java:65)
   at org.olat.core.commons.modules.bc.FolderRunController.event(FolderRunController.java:405)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:197)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:238)