p2p isn't the only way to deliver content overnight, content could also be delivered via multicast overnight.
http://www.intercast.com/Eng/Index.asp http://kazam.com/Eng/About/About.jsp On Apr 22, 2008, at 5:33 AM, <[EMAIL PROTECTED]> wrote: > >>> I think you're too high there! MPEG2 SD is around 4-6Mbps, >> MPEG4 SD is >>> around 2-4Mbps, MPEG4 HD is anywhere from 8 to 20Mbps, depending on >>> how much wow factor the broadcaster is trying to give. >> >> Nope, ATSC is 19 (more accurately 19.28) megabits per second. > > So why would anyone plug an ATSC feed directly into the Internet? > Are there any devices that can play it other than a TV set? > Why wouldn't a video services company transcode it to MPEG4 and > transmit that? > > I can see that some cable/DSL companies might transmit ATSC to > subscribers > but they would also operate local receivers so that the traffic never > touches their core. Rather like what a cable company does today with > TV > receivers in their head ends. > > All this talk of exafloods seems to ignore the basic economics of > IP networks. No ISP is going to allow subscribers to pull in 8gigs > per day of video stream. And no broadcaster is going to pay for the > bandwidth needed to pump out all those ATSC streams. And nobody is > going to stick IP multicast (and multicast peering) in the core just > to deal with video streams to people who leave their TV on all day > whether > they are at home or not. > > At best you will see IP multicast on a city-wide basis in a single > ISP's network. Also note that IP multicast only works for live > broadcast > TV. In today's world there isn't much of that except for news. > Everything > else is prerecorded and thus it COULD be transmitted at any time. IP > multicast > does not help you when you have 1000 subscribers all pulling in 1000 > unique > streams. In the 1960's it was reasonable to think that you could > deliver > the > same video to all consumers because everybody was the same in one big > melting > pot. But that day is long gone. > > On the other hand, P2P software could be leveraged to download video > files > during off-peak hours on the network. All it takes is some cooperation > between > P2P software developers and ISPs so that you have P2P clients which > can > be told > to lay off during peak hours, or when they want something from the > other > side > of a congested peering circuit. Better yet, the ISP's P2P manager > could > arrange > for one full copy of that file to get across the congested peering > circuit during > the time period most favorable for that single circuit, then > distribute > elsewhere. > > --Michael Dillon > > As far as I am concerned the killer application for IP multicast is > *NOT* video, > it's market data feeds from NYSE, NASDAQ, CBOT, etc. > > _______________________________________________ > NANOG mailing list > NANOG@nanog.org > http://mailman.nanog.org/mailman/listinfo/nanog > --- Bruce Curtis [EMAIL PROTECTED] Certified NetAnalyst II 701-231-8527 North Dakota State University _______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog
