[opendtv] Re: Half Truths - Was More 1080p@60

Craig Birkmaier wrote:

> But at low frame rates like 18 or 24, we need careful control
> of the viewing environment to prevent the perception of flicker
> (i.e. a darkened movie theater). By the time we get to 36 fps
> we get very good motion continuity, although this is not adequate
> for rapid motion like sports. For sports, 72 fps would have been
> a good target, as it provides excellent continuity in rapid
> motion, better instant replays, and the frame rate is high enough
> to prevent the perception of flicker even in brightly lit
> environments - there were good reasons why Europe established 72
> fps as the floor for computer display refresh rates!

I remember you making these same arguments is the mid 1990s.

One thing is that the huge base of 24 fps movie archives, still growing,
is not going away anytime soon. So the 18/36/72 idea doesn't work well
for that.

Another point is that what you'd be doing in fact is always increasing
the bit rate compared with now.

Everything now possible with 24 fps, such as non-sports programming,
would most likely have to be transmitted at 36 fps. Everything now
possible at 50/60 fps, sports primarily, would have to migrate up to 72
fps. So all things equal, you're increasing the required bit rate every
time.

All of this only applies to motion portrayal, of course. Flicker
reduction is done by "decoupling" the transmitted frame rate from the
displayed frame rate, as you frequently say, so it's never an issue.
(Not even in cinema.) So what computer displays do almost never applies
to these discussions, since they are primarily concerned with flicker
reduction and still graphics.

Bert

 
 
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