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.

Thanks again!

Post edited December 31, 2014 at 5:20 AM EST.