As your channel is currently offline I found out other channel on the same platform and it should work like this.
Code:
rtmpdump -r "rtmp://199.9.255.203/app" -a "app" -f
"WIN 11,5,502,146" -W "http://www-cdn.jtvnw.net/widgets/live_frontpage_player.r
0e1d62d0a743f647535f85603a89f6bac74583bd.swf" -p "http://pl.twitch.tv/" -j "49d9
1f2ab765d06892be522c0879252355e73832:{\"swfDomains\": [\"justin.tv\", \"jtvx.com
\", \"xarth.com\", \"twitchtv.com\", \"twitch.tv\", \"newjtv.com\", \"jtvnw.net\
", \"wdtinc.com\", \"imapweather.com\", \"facebook.com\", \"starcrafting.com\"],
\"streamName\": \"jtv_fM7H8SJbnhK1C2y_\", \"expiration\": 1357920276.312999, \"
server\": \"video15-1.ams01\"}" -y "jtv_fM7H8SJbnhK1C2y_" | vlc -
RTMPDump v2.4 GIT-2012-11-09 (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 download at: 0.000 kB
INFO: Metadata:
INFO: duration 0.00
INFO: width 640.00
INFO: height 360.00
INFO: videodatarate 500.00
INFO: framerate 30.00
INFO: videocodecid 7.00
INFO: audiodatarate 92.77
INFO: audiosamplerate 44100.00
INFO: audiosamplesize 16.00
INFO: stereo TRUE
INFO: audiocodecid 10.00
INFO: author
INFO: copyright
INFO: description
INFO: keywords
INFO: rating
INFO: title
INFO: presetname Custom
INFO: creationdate Thu Jan 10 18:35:59 2013
INFO: videodevice XSplitBroadcaster
INFO: avclevel 32
INFO: avcprofile 100
INFO: videokeyframe_frequency 0
INFO: audiodevice VHAudioCustom
INFO: audiochannels 1
INFO: audioinputvolume 100
INFO: bufferSize 2048k
INFO: maxBitrate 2048k
INFO: xsplitBroadcasterVersion1.3.0.51
INFO: xsplitCoreVersion 1.1.1210.3101 Version 1.1
INFO: xsplitGameSourceVersion 1.1.1.16
INFO: xsplitMediaLibVersion 2.0.0.149
INFO: encoder Lavf54.6.100
INFO: filesize 0.00
268.048 kB / 3.48 sec
ERROR: Download: Failed writing, exiting!