add
-v in your parameter and try again
or...
try my code
Code:
rtmpdump -v -r "rtmp://174.127.86.18/vod/_definst_" -a "vod/_definst_" -f "WIN 14,0,0,145" -W "http://p.jwpcdn.com/6/9/jwplayer.flash.swf" -p "http://player.screenwavemedia.com/play/player.php?id=TeamFourStar-53d153b50c86f" -y "mp4:TeamFourStar-53d153b50c86f_hd1.mp4" -o "output.flv"