the following command will get you lecture audio.
Code:
rtmpdump -r "rtmp://videoserver.yourotherteacher.com/whiteboard/lectures" -a "whiteboard/lectures" -W "http://www.yourotherteacher.com/lm/swf/whiteboardplayer.swf" -p "http://www.yourotherteacher.com/lmPlayer.html?vID=36830" -y "iaanvfyr2g" -o Test.flv
as far as the video part is concerned there is no actual video to download just flash animation over static images. can't suggest anything else than screen capturing for video part.