rtmpdump updates for raspberry pi/raspbian

[Alex Eames]

> Not quite the conclusive result we thought we might get.

Have now managed to generate a failure on the Pi.

sanity failed
RTMP Readpacket failed to read RTMP packet body
and it hangs there.

after 3 or 4 tries it seems to be downloading.

This is exactly the problem I've been having within the last month or 
two on the server
(which I haven't played with today yet.)

So maybe we do have the outcome we were looking for after all, but it's 
intermittent