On Fri, 2 May 2008 03:55:43 +0000 (UTC) Alan <nospam@[EMAIL PROTECTED]
>
wrote:
| In article <fvbmk6119f1@[EMAIL PROTECTED]
> phil-news-nospam@[EMAIL PROTECTED]
|>Apparently, a station can carry 720p60 programming and still squeeze in
a
|>channel or two of SD programming. How many 720p24 programs could be
carried
|>on ATSC? It sure seems obvious that at least 2 can be carried. How
about 3?
|
| How many? It depends on the number of channels. You could probably do
6 or 7
| per channel. They would look like garbage, of course, but such is the
problem with
| insufficient bit rate.
Then I guess it was not obvious enough to assume I meant "of reasonably
good
quality". I guess I need to always make these things clear in all future
posts. Obviously you understand the distinction since you referred to
such
signals looking "like garbage" if you squeeze 6 or 7 in.
| I could have sworn that with all your claims of technical knowledge,
you would
| have understood this, Phil.
It's not entirely of a technical nature. There can be many non-technical
aspects of this, such as a station's willingness to engage in a business
model that management can't understand. How many station managers even
know
what "720p24" or "1080p24" is (I'm not talking about chief engineer, if
they
even have one of those anymore ... I'm talking about the big pencil pusher
in the big chair in the big office that might not even be in the same city
as the station).
That, and I don't know what actual bit rates correspond to actual visible
quality, since I don't have a TV that shows what bit rate is actually
there.
And many times what I ask is more about getting a discussion going.
Lots of old TV is on film. When I see/here a reference to old TV shows,
what
pops into my mind are things like Perry Mason, Gilligan's Island, The
Munsters,
The Addams Family, and Star Trek TOS. If it were not for the cost of
doing it,
I'd like to see all these old shows re-telecined at 480p24, 720p24, and
even
1080p24. I'm guessing most of them were shot at 24 fps, not 30 fps
(though
some more recent shows re****ted have been shot at 30 fps, but I have not
heard
of any specific names).
I don't (yet) get RTN (I'm working on it). For now, I'm sure they are
still
doing everything in 3:2 for the analog broadcasts. But if their
programming
is mostly made up of these older TV shows, why not start ****fting things
over
to a p24 format? I don't know if it would make much sense for these shows
to
do anything more than 480p24. Most are probably shot in 4:3 aspect ratio
for
TV, anyway, so going 720p24 would be pillarboxed, anyway (but solid set
black
for the sides would at least reduce bandwidth a bit more).
Movies, though, would make more sense at 720p24 or 1080p24. It depends on
what kind of market exists for a TV station to focus so much on movies as
to
go with an all 720p24 (x3). Or they could do 1080p24 on subchannel 1 and
do
720p24 on subchannel 2 (movies on .1 and old TV shows on .2).
I'd also like to see a network like RTN go with more program streams for
their
"full channel" stations. Imagine RTN.1, RTN.2, RTN.3, RTN.4, RTN.5, and
RTN.6
all showing old TV reruns in various genres at 480p24.
--
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| Phil Howard KA9WGN (email for humans: first name in lower case at
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