try this
Code:
rtmpdump -r "rtmp://cp39920.live.edgefcs.net:1935/live" -a "live" -f "WIN 10,3,183,7" -W "http://cdn1.ustream.tv/swf/4/viewer.rsl.755.swf" -p "http://www.nasa.gov/multimedia/nasatv/ustream.html" -y "nasahd@55196" -v | "C:\Program Files\VideoLAN\VLC\vlc.exe" -
or
Code:
rtmpdump -r "rtmp://cp39920.live.edgefcs.net:1935/live" -a "live" -f "WIN 10,3,183,7" -W "http://cdn1.ustream.tv/swf/4/viewer.rsl.755.swf" -p "http://www.nasa.gov/multimedia/nasatv/ustream.html" -y "nasahd@55196" -v | "C:\Program Files (x86)\VideoLAN\VLC\vlc.exe" -
also make sure you have latest version of vlc installed.