episteme on 09 March 2014
The OP is what i wrote a few weeks ago...
The 40 Mbps are the peaks that are needed for a consistent picture. The average is between 3 and 5 which is enough for x264 at 854x480.
The very high needed peaks are a reason why the distance isn't higher. Affordable tech from 2012 couldn't do high bandwidth + high distance + almost no input lag at the same time.
