This is an old problem (see
http://stream-recorder.com/forum/fai...nk-t12380.html) but the things have changed and you need now the sig parameter to download each part.
for example,
rtmpdump -r "rtmp://media.hocmai.vn/hocmaisrv/2011-2012/Vat li/LTDH/Dang_Viet_Hu
ng/07.21.Dai_cuong_ve_dao_dong_dieu_hoa_(Phan_1)/" -a "hocmaisrv/2011-2012/Vat li/LTDH/Dang_Viet_Hung/07.21.Dai_cuong_ve_dao_dong_dieu_hoa_(Phan_1)/" -f "WIN 11
,0,1,152" -W "http://hocmai.vn/file.php/254/moddata/scorm/6040/Main.swf" -p "http://hocmai.vn/file.php/254/moddata/scorm/6040/index.html?vitri=1" -C S
assed_para -y "01.flv" -o 01.flv
(this url maybe dont exist yet, its only an example)
does not work cause you've lost the sig parameter
-p "http://hocmai.vn/file.php/254/moddata/scorm/6040/index.html?vitri=1&sig=4Jxq7Y00a483UnbAWYjN4SOIkOo V4ujY"
Foreach part you need to change the vitri parameter and get new sig.
This sig parameter expires fastly so you need to launch rtmpdump inmediately.