Java Media Framework
From Sun's JMF site: "The Java Media Framework API (JMF) enables audio, video and other time-based media to be added to applications and applets built on Java technology. This optional package, which can capture, playback, stream, and transcode multiple media formats, extends the Java 2 Platform, Standard Edition (J2SE) for multimedia developers by providing a powerful toolkit to develop scalable, cross-platform technology."
The JMF PKGBUILD can be downloaded from AUR  Run makepkg and install the package
In order to setup JMF for the first time (to recognize audio and capture devices) you'll need to run as root:
sudo LIBXCB_ALLOW_SLOPPY_LOCK=true jmfinit
You can manually setup JMF running as root:
Adding MP3 Support
In order to add the Mp3Plugin to the JMF Plugin System , you'll have to run as root:
Adding more audio/video codecs support with JFFMpeg
The JFFMpeg PKGBUILD can be downloaded form AUR  Run makepkg and install the package. The install script will register the plugins and associate the mimetypes in the JMF registry
Testing JMF capabilities
A demo player is available to test JMF audio/video playback capabilities.