try that
Code:
rtmpdump -r "rtmpe://cp21927.edgefcs.net:1935/ondemand" -a "ondemand?ovpfv=2.1.9-internal&?auth=dbEd2dwcPcJcLbpcPcKc6bqaOcdd7aRbMda-bti4pU-bla-d9i-IcyOdWof&aifp=v001&slist=video%%2F_!%%2FCBS_Production_MSN_Video_v4_Connector_Outlet%%2FCBS_Production_Entertainment%%2F2009%%2F05%%2F04%%2FPrimetime%%2FHow_I_Met_Your_Mother%%2FClips%%2FWebclips%%2F39%%2F125%%2Fhimym_stella_hd_1920x1080_24fps_050509_cbs" -f "WIN 12,0,0,77" -W "http://vidtech.cbsinteractive.com/player/3_3_0/CBSI_PLAYER_HD.swf" -p "http://www.bing.com/videos/watch/video/how-i-met-your-mother-the-return-of-stella/paj6fnvt?fg=rss" -y "video/_!/CBS_Production_MSN_Video_v4_Connector_Outlet/CBS_Production_Entertainment/2009/05/04/Primetime/How_I_Met_Your_Mother/Clips/Webclips/39/125/himym_stella_hd_1920x1080_24fps_050509_cbs??auth=dbEd2dwcPcJcLbpcPcKc6bqaOcdd7aRbMda-bti4pU-bla-d9i-IcyOdWof&aifp=v001&slist=video%%2F_!%%2FCBS_Production_MSN_Video_v4_Connector_Outlet%%2FCBS_Production_Entertainment%%2F2009%%2F05%%2F04%%2FPrimetime%%2FHow_I_Met_Your_Mother%%2FClips%%2FWebclips%%2F39%%2F125%%2Fhimym_stella_hd_1920x1080_24fps_050509_cbs" -o "output.flv"