rtmpdump repeatedly redownloading parts of video

[Lost1]

Hi,

I have the problem that rtmpdump is constantly redownloading specific parts of the video. Eventually it finishes but the resulted video got glitches like jumping back and forth at specific points.

This is my command line input:

rtmpdump -r "rtmp://apasfw.apa.at/cms-worldwide/" -a "cms-worldwide/" -f "WIN 11,1,102,55" -W "http://tvthek.orf.at/flash/player/TVThekPlayer_9_ver18_1.swf" -p "http://tvthek.orf.at/programs/1003023-Winterzeit/episodes/3520863-Winterzeit/3520867-Aktuelle-Reportage" -y "mp4:2012-01-31_1740_tl_02_Winterzeit_Aktuelle-Reportage__3520863__o__0001045663__s3520867___ge_O RF2bHiRes_17404113P_17460404P_Q6A.mp4" -o mp4_2012-01-31_1740_tl_02_Winterzeit_Aktuelle-Reportage.mp4

Anyone knows what the problem might be?

Thank you in advance!