When you download live streams, you need to use the following switch:
Code:
--live|-v Save a live stream, no --resume (seeking) of live streams possible
Another problem is that 192.168.0.0 – 192.168.255.255 IP addresses are common in home and office local area networks (LANs). These addresses are private because they are not globally delegated, meaning they aren't allocated to a specific organization. If such a private network needs to connect to the Internet, it must use either a network address translator (NAT) gateway, or a proxy server. So if you are trying to use rtmpdump outside your LAN, you will fail.
rtmpdump comes with rtmpsrv and rtmpsuck that can be used for finding RTMP parameters that are needed to be used with rtmpdump. So just try to use them.