try
Code:
rtmpdump -r "rtmp://bcastnw.livebox.cz:80/iprima_token" -a "iprima_token?auth=_any_|1380620979|ddaa7aee86a57ed9079afe21aaba7ceff518da0f" -f "WIN 11,8,800,168" -W "http://embed.livebox.cz/iprimaplay/flash/LiveboxPlayer.swf" -p "http://play.iprima.cz/ano-sefe/ano-sefe-v-7" -y "mp4:Prima-1210220001-20267_1000.mp4" -o "2013-10-01_08-49-49_mp4_Prima-1210220001-20267_1000.flv"