> HOWEVER, most of the 24x7 media sites (CNN, etc.) are doing on-demand
> video, rather than streaming a constant feed.
2) unicast doesn't scale to the sort of audiences of radio/tv
broadcasts and if you try it becomes financially unviable too
(even with people attempting to fake multicast, e.g. Akamai)
One way to manage both is to use the VCR model
The straight forward model to support the audiences of raiod/tv
by the Internet is to integrate the Internet with broadcasting
by sending IP (multicast) packet over radio wave.