http://java.sun.com/products/java-media/jmf/
You need not install JMF if you are not planning on using the JMF Actors.
For details about the JMF actors and Ptolemy, see:
James Yeh, " Image and Video Processing Libraries in Ptolemy II," Master's Report, Technical Memorandum No. UCB/ERL M03/52, University of California, Berkeley, CA, 94720, USA, December 16, 2003.
@since Ptolemy II 3.0