Please help me download video from this website

[youngdemon26]

http://hocmai.vn/mod/scorm/player.php?id=35248

LOGIN: username : dunghiep1416
password : dung1997

I try to download video from this site by rtmpdump with this code

rtmpdump -v -r "rtmp://media.hocmai.vn/hocmaisrv/2011-2012/Tieng_anh/LTDH-Co_Vu_Mai_Phuong/38.PP_lam_bt_phat_hien_loi_sai/" -a "hocmaisrv/2011-2012/Tieng_anh/LTDH-Co_Vu_Mai_Phuong/38.PP_lam_bt_phat_hien_loi_sai/" -f "WIN 17,0,0,134" -W "http://hocmai.vn/file.php/265/moddata/scorm/6958/Main.swf" -p "http://hocmai.vn/file.php/265/moddata/scorm/6958/index.html?vitri=3&sig=ptWsvAkkcwhlqDsQuY7dLIKHOxEXbvor" -C S:passed_para -y "03.flv" -o "outdadut.flv"

but get error

please help me to download video from this site

UPDATE: I just found and fixed the bug in my command code, the bug is the sig String in my command code. Now I can download the video from this site properly

sorry for my bad english