[opendtv] Optimization

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 16 Dec 2004 18:33:44 -0500

Craig Birkmaier wrote:

> But 480P is STILL plenty adequate for many applications,
> and more important, why not improve the quality of ALL
> TV, not just HDTV?

Exactly, Craig. Which means, cram as much info in the
channel or storage medium as capacity permits, subject
to the constraint that the channel or storage medium
is compatible with ALL TVs! This will improve the
quality of all TVs, small ones AND big ones.

So, 480 at 24p is probably a good choice for a station
wanting to multicast decent quality programs.

But 480 at 24p is not a good choice for next gen movie
DVD, as long these DVDs can hold an entire HD movie.
What are you saving that space for? Another movie in
the same disk? Does anyone care about that?

Similarly, a station wanting to broadcast sports and
attract a large audience of large screen fanatics will
opt for true HDTV, like 720 at 60p or 1080i, for the
duration of that game.

A station wanting to multicast one good quality sports
program along with an HD program will have to use 480
at 60p for the sports show, and may fit a 720 at 24p
for the HD program. Or certainly they can multicast
one 480 at 60p and one 480 at 24p stream.

> There are many applications for progressive video
> that is not HDTV.

As long as you are *not* negotiating a unicast
session over a relatively slow link, or otherwise
limited in channel capacity, there's just no reason to
limit the bitstream JUST BECAUSE you can do so.

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