Help with better syntax for audio stream dump

[charos]

Hi!

I need to capture an audio live stream for 2 hours with RTMPDump v2.4 GIT-2011-07-11 (Compiled by KSV) . After a lot of searches , trial & errrors I have the following syntax:

rtmpdump -r "rtmp://cp126784.live.edgefcs.net/live/" --live -v -y "enlevko@73167"  --swfVfy "http://enlefko.fm/sites/all/themes/enleyko/flash/EnLefko_RTMPPlayer.swf"    --stop 7200  -o tzoum.mp4a

The problem is that the stream dump is not consistent. Sometimes it just stays at

Connecting ...
INFO: Connected...

Other times I get

INFO: Connected...
ERROR: RTMP_ReadPacket, failed to read RTMP packet body. len: 4

Other times I get the notorious

Received FLV packet before play()!

But many times it works ok. Is there something wrong with my syntax?