QuickTime for Java provides a set of cross-platform APIs which allows Java developers to build multimedia, including streaming audio and video, into applications and applets.
New QTJava in QuickTime 6.4
The goal of this release is to provide QTJava developers with a new version of QTJava that works on both J2SE 1.3.1 and J2SE 1.4.1 on Mac OS X. The previous version of QTJava supported J2SE 1.4.1, but only on Windows. The intent of this release is to provide a basic set of functionality across all platforms that support J2SE 1.4.1 and QuickTime.
More to be read on the developer-site.