NullPointerException when using mp4's downloaded from youtube
Jason Cims
1 Posts
Hi Mr Brown,
First, thank you so much for the time and effort you put into this application. It's amazing.
I just wanted to let you know of an issue i've been experiencing as of late. I'm running windows 8 with 32-bit jvm from Oracle 7.60. I tinker with analysis from various youtube videos from time to time, and recently have been trying to use tracker to track club head speed in this video:
https://www.youtube.com/watch?v=gZJw3egz9qk
Using keepvid.com, I downloaded an mp4 of the above video in 720p, and am unable to seek around or insert a point mass to track without Tracker crashing. I've enabled logging to a file and see the following stacktrace:
05:03:51.888 [AWT-EventQueue-0] DEBUG com.xuggle.xuggler - Closing dangling StreamCoder (../../../../../../../csrc/com/xuggle/xuggler/StreamCoder.cpp:82) Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at org.opensourcephysics.media.xuggle.XuggleVideo.reload(Unknown Source) at org.opensourcephysics.media.xuggle.XuggleVideo.resetContainer(Unknown Source) at org.opensourcephysics.media.xuggle.XuggleVideo.getKeyPacket(Unknown Source) at org.opensourcephysics.media.xuggle.XuggleVideo.getKeyPacketForFrame(Unknown Source) at org.opensourcephysics.media.xuggle.XuggleVideo.loadPicture(Unknown Source) at org.opensourcephysics.media.xuggle.XuggleVideo.getImage(Unknown Source) at org.opensourcephysics.media.xuggle.XuggleVideo.setFrameNumber(Unknown Source) at org.opensourcephysics.media.core.StepperClipControl$2.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:694) at java.awt.EventQueue$3.run(EventQueue.java:692) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:703) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.run(EventDispatchThread.java:91) 05:03:53.757 [AWT-EventQueue-0] WARN com.xuggle.xuggler - Attempt to seekKeyFrame but container is not open (../../../../../../../csrc/com/xuggle/xuggler/Container.cpp:821)
Converting the video to AVI alleviates this problem.
I did try insalling quicktime to see if that would work but it doesn't seem to want to use that video engine. I'm happy to just convert the AVI so it's not a big deal.
Re: NullPointerException when using mp4's downloaded from youtube -
Douglas Brown
449 Posts
Hi Jason,
Thanks for your very complete bug report and workaround. I will modify XuggleVideo to catch this null pointer exception, and hopefully that will prevent Tracker from crashing, but unfortunately Xuggle may still be unable to play your downloaded MP4.