Ok. I'd like to use JMFs existing usage of multi-unicast with its RTPManager class to send strings to session participants. I've implemented a threaded updating bytearray to create the data for the pushbufferstream and then plugged that into an extended pushbufferdatasource to be used in RTPManager's createsendstream method. However, in overwriting the getFormat method for the extended pushbufferstream i've yet to set it to a format that createsendstream excepts. (ive been getting unsupported format exceptions). In general I wouldn't know what format to put for a raw stream of an updating bytearray. I feel that there must be some easier way to send these strings over multi-unicast but I haven't been able to find anything yet.