[opendtv] Re: 4k @ 60 fps encoded into 15 Mbps using HEVC
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 21 Oct 2012 18:38:34 -0500
Mark Schubin wrote:
> As to cognitive dissonance, watching a movie (or opera) in a cinema
> requires a financial outlay for a ticket, travel to the cinema,
> blocking out time, and possibly such other costs/requirements as
> getting a baby sitter, parking/transit fees, dinner, etc. If, after
> all of that, the viewer doesn't like the movie, then all of the
> expenditures of money and time were foolish. But the viewer doesn't
> want to be a fool, so there is a predisposition to like the event.
That cracked me up.
I completely agree with this and your other points. I suppose that if the
average joe went to the movies every day, some other activity would become the
"event," and the movie-going would be more like watching TV.
The theaters we usually go to suddenly all switched over to Sony Digital Cinema
4K, which is just about exactly twice as much horizontal and vertical as 1080p
HDTV: 4096 X 2160. The ads and other features that come before the show, and
before the actual movie previews, are instead 16:9 SDTV.
We like to sit about half-way up the seats, in the stadium style theaters. So
the screen looks quite large, compared with how we watch the 42" HDTV at home.
Anyway, it's easy enough to "count the pixels" when the SD pre-show stuff is
showing, but the Sony 4K, even on the 2:35:1 blockbuster format, is beyond
reproach, as far as I'm concerned. I'm wondering whether any more than that
even makes sense in a home format, even if 100" screens became the new normal.
A 100" screen is about 50" high and 87" wide. At say 10' viewing distance (too
close for comfort, IMO), that's a distance of 2.4 picture-heights. So that
calculates out to an angular separation of the pixels of 0.66 arcminutes at the
viewer's vantage point, which ought to be well within what the majority of
people can discern (the literature indicates anything from 1 to 2 arcmin, many
claim 1.5). Even acknowledging that any such numbers are just first order
approximations of actual visual acuity.
Bert
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