Ustream -- Use livestreamer:
http://github.com/chrippa/livestreamer/releases 
Code:
C:\livestreamer-v1.9.0>livestreamer "http://www.ustream.tv/channel/playstai126rert"
nidalive
Code:
rtmpdump -r "rtmp://109.123.116.154/live" -a "live" -f "WIN 13,0,0,214" -W "http://www.ucaster.eu/static/scripts/fplayer.swf" -p "http://www.ucaster.eu/embedded/nidallive2/1/728/460" -C S:OK --live -y "nidallive2?id=73165" -o "2014-09-05_05-10-48_nidallive2.flv"
kora-online
Code:
rtmpdump -r "rtmp://95.211.148.225:1935/live/" -a "live/" -f "WIN 13,0,0,214" -W "http://www.kora-online.tv/jwplayer/jwplayer.flash.swf" -p "http://www.kora-online.tv/kora1.html" --live -y "kora" -o "2014-09-05_05-16-02_kora.flv"
Cheers!