given another try, and I succeeded.
Code:
Make choice. Avoid level3.
0
+ rtmpdump -o a.flv -W http://download.hulu.com/huludesktop.swf -r rtmpe://cp39466.edgefcs.net/ondemand -y mp4:hulu23/547/60140547/agave50362837_13087154_H264_650.mp4 -a 'ondemand?auth=daEdmcGc2bpcldEaRaTdOc4ckduaCaDcsaF-bqKISa-c0-YpHDvDs0BAm&aifp=sll02152008&slist=hulu23/547/60140547;.international=false&hgt=OZU7Pvs7j27-nhteNno7wpjFkh93pwWIHWZOaIRQqhL-a4OamqtOBIcM5XepWao-jnaBYte-lmyjqYJmh6LC9Dr_RKJ864d0AO_2swuCO84QkWxx7o0M-kM4A7DAmNO_j9wYEX5H1mEPwBSMwCWdnx6DpzYEVaUJ50iMrqMnG5VZjso5XbR9qnR1po-Xz0RRlh4PDkhBOAy_brqO67pcvx61GKkJkjxuQOE5OqOA0BtZ2TNtMh2IvTUsxqtPwGum&hgt_ver=331370278'
RTMPDump v2.4 GIT-2012-07-26 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
ERROR: RTMP_HashSWF: connection lost while downloading swfurl http://download.hulu.com/huludesktop.swf
Connecting ...
WARNING: HandShake: Type mismatch: client sent 6, server answered 9
INFO: Connected...
Starting download at: 0.000 kB
INFO: Metadata:
INFO: duration 1321.90
INFO: moovPosition 36.00
INFO: width 640.00
INFO: height 360.00
INFO: videocodecid avc1
INFO: audiocodecid mp4a
INFO: avcprofile 100.00
INFO: avclevel 30.00
INFO: aacaot 2.00
INFO: videoframerate 29.97
INFO: audiosamplerate 24000.00
INFO: audiochannels 2.00
INFO: tags:
INFO: ©too Hulu v1.12
INFO: trackinfo:
INFO: length 39651612.00
INFO: timescale 30000.00
INFO: language und
INFO: sampledescription:
INFO: sampletype avc1
INFO: length 63451136.00
INFO: timescale 48000.00
INFO: language und
INFO: sampledescription:
INFO: sampletype mp4a
26532.354 kB / 336.07 sec (25.4%)