Yes, you need other programs to find RTMP URLs, find RTMPE stream URLs.

You may also need to find additional parameters. Sometimes you can find them from the source of the web-page. You can also use two additional server programs, rtmpsrv and rtmpsuck that come with rtmpdump 2.1:

rtmpsrv is a stub for a server; it logs the connect and play parameters from a regular client that connects to it. These parameters can then be used with rtmpdump to retrieve a stream.

rtmpsuck is a transparent proxy; it intercepts connections from a client and then makes an outbound connection to the real server. After all handshaking is complete and encryption keys with both sides are negotiated, it records the cleartext stream data into files while relaying the data from the server to the client.