You can play multicast RTP streams using an SDP file. An .sdp file is a text file that provides descriptive information about the stream and gives the user's computer instructions for tuning in. In one case (In-8), the SDP file must be manually FTPed to the DME. For other live use cases or stored streams, the SDP file is automatically created on the RTP or RTMP VOD server. To play streams with an SDP file you will use a URL similar to the following:

In QuickTime or VLC you open the player and point to the .sdp file. In StreamPlayer you must enter the complete path to the file in the IP Address field and then click Play.