try this
Code:
rtmpdump -r "rtmp://brightcove-60.fcod.llnwd.net:1935/a500/e1/uds/rtmp/ondemand" -a "a500/e1/uds/rtmp/ondemand?videoId=9453696001&lineUpId=&pubId=1568176135&playerId=1791339103001&affiliateId=" -f "WIN 11,4,402,265" -W "http://admin.brightcove.com/viewer/us20120928.1313/federatedVideoUI/BrightcovePlayer.swf" -p "http://www.lightreading.com/video.asp?doc_id=129576" -C B:0 -C S:"1568176135/1568176135_9458825001_129576-01-768K&1349197200000&fdb7f927321cff629e1a7f640d3aa3e1" -y "1568176135/1568176135_9458825001_129576-01-768K?videoId=9453696001&lineUpId=&pubId=1568176135&playerId=1791339103001&affiliateId=" -o "output.flv"