[rtmpdump] Youtube-RTMP

[double]

Hello,

In the past we could download youtube-rtmp videos via
rtmpdump (called from youtube-dl), e.g.:
     youtube-dl http://www.youtube.com/watch?v=Ftt69Z0Vx6g

We get this error-message:
     RTMPDump v2.3
     (c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; 
license: GPL
     Connecting ...
     INFO: Connected...
     ERROR: rtmp server sent error
     ERROR: rtmp server requested close

Thanks a lot
Marcus