[opendtv] Re: Multicast to the World?
- From: Don Moore <don@xxxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 8 Jun 2009 16:42:47 -0400
The MultiCast Protocol is normally blocked by most ISP Routers. It
must be unblocked at several levels - many of which neither the
originator nor the recipient have control or influence.
It is as much a security concern as it is a concern over content
distribution that the ISP's can't control or charge.
On Mon, Jun 8, 2009 at 12:41 PM, <dan.grimes@xxxxxxxx> wrote:
>
> It is my understanding that passing multicast packets is not widely
> available, at least not widely active, on the world wide web. Thus, one
> might be able to provide multicast streaming within their own network
> ("walled garden") such as the cable company's broadband system. However,
> for independent content providers, streaming over multicast to anyone is not
> yet a reality. Am I correct in this? If so, I am not so sure that
> delivering media over multicast within a cable company's own infrastructure
> isn't the same as delivering the media streams over modulated carriers,
> whether in IP packets or continuous MPEG-2 streams. I suppose it does
> provide more VOD functionality. I see the ability to reliably stream
> program content directly to anyone in the world to be the important barrier
> lift. For now, that means unicast.
>
> But I understand Craig's point that there are political reasons for not
> providing direct streaming. It certainly would affect the big media income.
>
> Dan
>
> Original messages:
> -------------------------------------------------------
> Date: Sat, 6 Jun 2009 08:27:08 -0400
> From: Craig Birkmaier <craig@xxxxxxxxx>
> Subject: [opendtv] Re: ATSC and Lip Sync
>
>>
>>
> >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."
>>
>
> Somebody needs to update the entry. The end result is essentially
> correct. But the reasons that this is not happening are purely
> political, given the reality that cable and the telcos control the
> market for broadband and DO NOT want to kill the subscription TV PIG.
>
> Regards
> Craig
>
> -------------------------------------------------
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