[opendtv] Re: Twang's Tuesday Tribune (Mark's Monday Memo)
- From: "Kon Wilms" <kon@xxxxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 7 May 2004 00:14:29 -0700
>My money would be more along these lines too. Viewers subscribing
to different "multicast groups" in a station's multiplex.
Advertizers placing ads in "multicast groups" that would appeal to
that audience. Really not much different from what can be done now,
using simple frequency division multipexing, but much more flexible
in that you can create more groups, at various bit rates, and
non-real-time channels too.
That's all good and you're basically describing what any basic datacasting
system can do. A channel is usually assigned a bitrate and a multicast
address. Those channels can carry serial or parallel queues of carousels,
ecc'd, streamed, or reliable multicast data. But that's not the most
efficient way to do this. I've been down this route and done this all
before. Broadcasting to groups in parallel with multiple channels does not
work because if you have a large number of ads you end up with individual
bitrates which may be near to zero for each group. So there is no
scaleability, and delivery time increases whenever a new channel is added.
The best solution is to use a primary default cache queue which simply fills
everyone's cache with some default or universal content, and a secondary
prioritized queue that lets receivers pick out content as it comes by which
is specifically tagged with group and target IDs.
Cheers
Kon
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