Just use the same code & run RTMPDumpHelper to change the dynamic playpath (-y) parameter.
Code:
rtmpdump -v -r "rtmpe://158.85.70.80/flash" -a "flash" -f "WIN 21,0,0,242" -W "http://static3.sawlive.tv/player.swf" -p "http://sawlive.tv/embed/watch/I4N2JjZTQ4Y2UxZjlkM2VhNWRjNmYwMDE3/bGFnemVpaXllOmVhZTdmYTA4MzI4ZDcwZDNkM2JlOWYyMzhiNzU1YTM4OjI3OWU4NG" -y "18303?MTQ2NDYzMjQ4MjtlNTc0MTc0NzI0NGFhMTE4MjExZDkzMGVjOTVmODgxNA==" -o- | "C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" --meta-title="TEST" -