FFMpeg.exe -i "rtmpe://fmss.vpro.nl/media pageUrl=http://3voor12.vpro.nl/tv/ playPath=mp4:4508
5903.mp4 swfUrl=http://3voor12.vpro.nl/flash/vodmediaplayer-23082011.swf swfVfy=1" -vcodec copy -acodec copy Test.flv
above command works as expected with the builds from http://ffmpeg.zeranoe.com/builds/. but it fails with your builds of ffmpeg and mplayer.
your build doesn't pass the space separated options correctly to librtmp.