Be sure to install Xuggle if you do not yet have version 5.4.0. Also, if you have not yet done so, please check out the new Shared Collections menu in the Digital Library Browser which gives you direct access to video collections from LivePhoto and others. See Sharing Your Collection the Easy Way to learn more.
Note: Xuggle 5.4.0 can still cause some videos to exhibit a 4-frame "lag" that is particularly evident when you step the video a few frames forward, then back. I am working with the Xuggle developers to fix this problem, but in the meantime you may wish to use the QuickTime video engine if it available on your machine. Note: you must run Tracker in a 32-bit Java VM to use QuickTime.