in rtmpdump script, you should input sth like this:
Code:
rtmpdump -r "url" -a "app" -W "embedded SWF" -p "page refer" -y "playpath" -o "output file name"
Usually in these sites, -p parameter is important !! try to input webpage link in script, then!!
Or perhaps they are using token string which generates for each connection and is valid for a few sec!