Working fine to me for ten minutes. But if you stop it after few minutes, you have to refresh session as it expires.
Code:
rtmpdump -r "rtmp://live.dacast.com/201346/1724" -a "201346/1724" -f "WIN 11,6,602,180" -W "http://player.viewer.dacast.com/DacastPlayer.swf" -p "http://www.telesud.com/le-live/" -C B:1 -y "2040?98c225bc9c5038533a7c5b93d231bcef4a0150101f7f2bdfc71c03e40b8dc4409857" | vlc -
RTMPDump v2.4 GIT-2012-12-30 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
WARNING: You haven't specified an output file (-o filename), using stdout
Connecting ...
INFO: Connected...
Starting Live Stream
INFO: Metadata:
INFO: width 640.00
INFO: height 480.00
INFO: videodatarate 1000.00
INFO: videocodecid avc1
INFO: audiodatarate 64.00
INFO: audiocodecid mp4a
83664.021 kB / 636.12 sec
ERROR: Download: Failed writing, exiting!