[opendtv] Re: Frames Per Second of 720P

  • From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Sun, 27 Jul 2008 21:40:15 -0400

Tom Barry wrote:

> The net result is I really do want things framed differently
> between my phone and front projector.

I don't doubt that streams meant for mobile hand-held devices would be 
formatted differently than programs optimized for typical fixed receivers. That 
seems so drop-dead obvious as to be uninteresting to dwell over, though.

First of all, it's still possible that broadcasters want that content to also 
be available to their fixed receiver viewers. Is there a down side to the 
broadcaster? If the broadcaster is going to bite into his SD and HD bit stream 
anyway to provide M/H service, it's absurd to think that making this also 
available to fixed receivers somehow makes the penalty worse.

Secondly, that content could potentially be delivered in a PIP display of the 
fixed receiver, so the small screen formatting could still work.

Most importantly, though, if fixed receivers have the M/H demod, they could 
make use of the robust stream capability for times like John Shutt mentioned in 
the past. Example, if transmitter power has to be reduced for maintenance. 
Presumably, the broadcaster wants to retain his coverage area in these cases?

To me, an extra tool in the OTA broadcaster's tool chest should be used as 
effectively as possible. Besides which, chip vendors will probably soon 
incorporate the M/H demod in all their ATSC chips, at which time the cost 
difference to fixed receivers will be minimal.


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