[mythtv-users] 5200 or 6200

Steven Adeff adeffs.mythtv at gmail.com
Wed Jan 24 21:08:35 UTC 2007


On 1/24/07, Rich West <Rich.West at wesmo.com> wrote:
> Jarod Wilson wrote:
> > Steven Adeff wrote:
> >> On 1/24/07, Jarod Wilson <lists at wilsonet.com> wrote:
> >>> On Jan 24, 2007, at 00:29, Stroller wrote:
> >>>
> >>>
> >>>> 1080i is 1920  1080 with every other horizontal line being updated
> >>>> each refresh. Under 1080p _every_ line is updated each hz, so twice
> >>>> as many pixels must be pushed (but the image won't look twice as
> >>>> good, as I understand it; I guess it may even be indistinguishable to
> >>>> many people, even if you have 1080p content).
> >>>>
> >>> Its likely in many cases untrained eyes won't see the difference, but
> >>> I'm pretty certain that the bigger the 1080p set, the more people
> >>> would indeed notice the difference with 2x the resolution available.
> >>>
> >> 1080p is not twice as many pixels as 1080i
> >>
> >
> > Yes it is. Or at least, it can be. (See below :)
> >
> >
> >> its a misconception on how
> >> digital interlaced video works. In fact every frame of both formats
> >> has the same number of pixels so in fact the pixel "rate"/count for
> >> both at the same frame rate is the same.
> >>
> >> If you have a 1080p TV then the only difference you would notice on
> >> 1080i content is dependent on the quality of de-interlacing between
> >> Myth and your TV. In theory, 1080i broadcasts should be fully
> >> IVTC-able and should have flags for proper 3:2 pull down, but they
> >> usually don't. Many TV's use an mixed process that includes basic IVTC
> >> which is more advanced than what Myth uses, but whether the results
> >> are better would require some A:B tests as it would be very close.
> >>
> >> See
> >> http://en.wikipedia.org/wiki/1080i#1080i_vs_1080p
> >> for a good description on the differences.
> >>
> >
> > Okay, read it, and I read it to say that 1080p60 is indeed 2x the
> > resolution of 1080i60, but that 1080p24 and 1080p30 are more commonly
> > found in the wild today.
> >
> > Additional reference material:
> > http://en.wikipedia.org/wiki/1080p#Broadcasting_standards

fields vs frames my friend. two fields = 1 frame.
(1080 / 2) * 2 = 1080.

-- 
Steve
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