No, it's the server - not the client - that decides the characteristics of a RTSP stream, including whether it's unicast or multicast. The only way for a RTSP client to explicitly choose between a unicast and a multicast stream is if the server has been set up beforehand to serve both kinds of stream - each with a different name. (Then the client can use the stream's name - and thus "rtsp://" URL - to choose which stream it wants.)
Ross Finlayson Live Networks, Inc. http://www.live555.com/
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