[opendtv] Re: ATSC and Lip Sync

  • From: Tom Barry <trbarry@xxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 06 Jun 2009 09:31:18 -0400

John Shutt wrote:
> Multicasting is not mature enough to even begin to replace satellite
> distributed programming on a nationwide scale.  So far it only works
> within walled gardens.
>
>> From Wikipedia's multicast entry:
>
> http://en.wikipedia.org/wiki/Multicast
>
> "No mechanism has yet been demonstrated that would allow the IP
> multicast model to scale to millions of senders and millions of
> multicast groups and, thus, it is not yet possible to make
> fully-general multicast applications practical. For these reasons, and
> also reasons of economics, IP multicast is not in general use in the
> commercial Internet."
>
> John
>
-- no longer quoting John below ---.
> Millions of receivers can be done.  Millions of senders and multicast
> groups would be like millions of national TV networks and that
> cannot.  But it doesn't have to be.  If you substitute dozens of
> multicast groups then it is a different story.  Only a very few
> sources of content have the visibility, demand, and economy of scale
> to justify millions of SIMULTANEOUS viewers.  But we were talking
> about the Super Bowl here.

- Tom
 
 
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