Stream corrupt error and then rtmpdump goes nuts

[spam.mc]

 >I'm not convinced this will really help, but does someone with even 
faster fibre than me care to give it a try? (some judicious installation 
of real ethernet cable got mine running reliably at 55Mbps, but I still 
can't reproduce the problem people were reporting here.)

Maybe I'm being thick,  but can't someone setup a server on a local 
network to stream from and then test connecting the rtmpdump client to 
that?  Then it would be possible to test at 100Mbps or even 1Gbps 
speeds.   Even if a server program isn't available I'm sure an existing 
stream could be captured somehow and the same network commands played 
back to the client?

What obvious thing am I missing?