Its working but also used dynamic playpath (?ticket=hashX) per session.If hash is no more valid then you get a rejected message by rtmpdump.
Code:
rtmpdump -v -r "rtmp://cdn94.cast247.tv:443/live" -a "live" -f "WIN 14,0,0,179" -W "http://www.cast247.tv/swf/player.swf" -p "http://www.cast247.tv/embed.php?channel=strompl&width=640&height=380&domain=web.zone.ee" --live -y "strompl?ticket=c8d469166e3be61caaf3eb3d64fae149" | "player" -
rtmpdump -v -r "rtmp://cdn68.cast247.tv:443/live" -a "live" -f "WIN 14,0,0,179" -W "http://www.cast247.tv/swf/player.swf" -p "http://www.cast247.tv/embed.php?channel=strompl&width=640&height=380&domain=web.zone.ee" --live -y "strompl?ticket=bd44c2b8ee323f6e7447890a7906541a" | "player" -
greetz