Wireshark doesnt' recognises RTMP streams

Question

Hello! I found on the web few samples on tracking RTMP (Real Time Messaging Protocol) with Wireshark, but it doesn't work for me. All RTMPT packets rendered as basic TCP packet like this:

149 14.324999   85.115.xxx.xxx  192.168.1.20    TCP macromedia-fcs > 54557 [ACK] Seq=1 Ack=1452 Win=69 Len=0

I'm using Wireshark 1.2.8 with all protocols installed on Windows Vista.

What can i do to fix it?

Thx!