It's good in what it does. But it seems to be stale. No activity on it for a few years.
OCUP UML fundamental and ITIL foundation
posted 9 years ago
JMF hasn't seen development in several years. Audio and video in general are weak points with Java. Other options for playback exist (QuickTime4Java and JVLC), but for working with media I'm not aware of any.
I'll move this to the Other Java APIs forum where JMF is generally discussed.