It seems that you are not using the correct playpath in your command line. I had to fix few AMF3 decoding issues so the rtmpsuck doesn't crashes while capturing the stream. try to remove the base64 encoding from stream playpath.
Code:
rtmpdump -r "rtmpe://94.242.254.72/xlive" -a "xlive" -f "WIN 18,0,0,232" -W "http://videostream.dn.ua/videopage/images/VideoPlayer.swf" -p "http://videostream.dn.ua/videopage/videoPage.php?g=dWJwZ3NlK2FvZ2VxdW1A&c=tr&i=eWl2anRkb2dxZw%E2%84%96f%E2%84%96f%20" -C S:client -C S:3.1.0.9 -C S:tr --live -y "raw:sl1_66044" -o "2015-10-12_03-22-43_raw_sl1_66044.flv"
Code:
RTMPDump v2.4 GIT-2015-01-15 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
ERROR: rtmp server sent error
Starting Live Stream
INFO: Metadata:
INFO: presetname Custom
INFO: creationdate Mon Oct 12 12:19:59 2015
INFO: videodevice XSplitBroadcaster
INFO: framerate 25.00
INFO: width 512.00
INFO: height 288.00
INFO: videocodecid avc1
INFO: avclevel 21.00
INFO: avcprofile 100.00
INFO: videodatarate 390.62
INFO: videokeyframe_frequency 0.00
INFO: audiodevice VHAudioCustom
INFO: audiosamplerate 44100.00
INFO: audiochannels 2.00
INFO: audioinputvolume 100.00
INFO: audiocodecid mp4a
INFO: audiodatarate 93.75
INFO: bufferSize 500k
INFO: maxBitrate 500k
INFO: xsplitBroadcasterVersion1.3.0.238
INFO: xsplitCoreVersion 1.3.1403.1202 Version 1.3
INFO: xsplitGameSourceVersion 1.1.1.117
INFO: xsplitMediaLibVersion 2.0.0.324
INFO: pluginName CustomRTMP
INFO: pluginVersion 1.3.1405.2901
603.746 kB / 14.51 sec