Help for a webcam site

[barbjones]

I am trying to record from the site called:
http://www.cheapercams.com/

I am using rtmpdump and i get the follow source:

rtmpdump -r "rtmp://streamsrv3.xmodels-live.ch/webcams/c21377" -a "webcams/c21377" -f "WIN 11,6,602,171" -W "http://secure.dnxlive.com/bundles/dnxfront/swf/livePreviewPublic.swf" -p "http://www.xcams.be/el" --live -C S:PUBLIC_PREVIEW -C S: -y "c21377" -o c21377.flv

streamsrv3 can change to streamsrv2 or streamsrv1-depends on which one the girl connected.
c21377 is the "code" of girls and never change for the same girl.The above is for "Marjolein".

The rtmpdump code is in the main page of the site,when i move cursor on the image of a girl and i get a preview video for a few secs.
The problem is that video stops recording too after a few secs.
After 2 mins you can get again a few secs of recording.
But the video continues playing
Can someone help me to find a way to not-stop the recording?
PS:Sorry cause my english sucks....