www.broadinstitute.org : rtmpdump downloading 0kb of an rtmp stream

[freeseek]

I am trying to download the stream accessible at the following URL:

http://www.broadinstitute.org/outreach/midsummer/videos/2010BruceBirren.html

using rtmpdump 2.3 with the command:

rtmpdump -n vstream.broadinstitute.org -a simplevideostreaming -y midsummernightsscience/skathiresan/midsummernightscience_07282010.mov -s http://www.broadinstitute.org/mediaplayers/jw/player.swf -o output.mov -V

but the only result is that I keep getting repeated at constant intervals of time:

DEBUG: HandleCtrl, received ctrl. type: 6, len: 6
DEBUG: HandleCtrl, Ping ######
DEBUG: sending ctrl. type: 0x0007

and nothing is downloaded. Am I doing something wrong?