Most of the “which is better?”
factors are a subset of the camera the footage was acquired on and are rarely
dependent upon raster size, when comparing 720p vs 1080i. Even further, the
discussion of 60i vs 24p has a LOT to do with
how the camera handles those progressive frames. I use the Panasonic HVX200,
for example. It uses a film-camera-like shutter (variable shutter angle) that
can vary the exposure on the CCD, closely approximating the look of film at
24p. 24p juddering is minimized by nice film-like motion blurring. No one has
ever pointed out any juddering on my productions. Benefit to me is that the
720/24p DVCProHD data stream (pulldown occurs on camera) is actually only
40Mb/s, allowing me to get as many as 7 layers realtime performance on the
Matrox Axio HD editing system I use. My thought is “why waste bandwidth
and storage space by going to 1080i/p if my market is still going ga-ga over
720/24p?”
The general school of thought on
interlaced vs progressive is that, given 60p vs 60i, progressive is cleaner and
nicer. I don’t know that anyone is talking about 1080/60p right now. When
it comes to 1080/24p vs 1080/60i (in the US), I really don’t think most
people will notice, or care; therefore, as an editor, I’m going to do
what’s best for me…..lower datarate/storage capacities by choosing 720/24p.
On my camera, 1080i vs 720p is barely different…not enough to motivate me
to choose 1080i; plus, on an 8GB P2 card, I get 20 mins of 720/240p, but only 8
mins of 1080/60i.
I work at a community college in Utah where I’m the first to go HD. 720/24p is SO
much better/sharper/nice than 480/60i….and given that my camera is best
suited for 720/24p (in the US) and uses square pixels, I’ve really got no
reason to go higher than 720/24p. Even at ½ res (640x360 (at) 24p) I get superb
quality web streaming video via Windows Media HD.
Realize too, this discussion has little to
do with the various render formats/framerates you all might be using. I don’t
do digital intermediates to 4K film sizes…ever….just no need in my
market right now.
John
From:
owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Arvid Björn
Sent: Monday, April 09, 2007 8:53
AM
To: XSI(at)Softimage.COM
Subject: Re: 720i
Some people claim that
1080i is the same 540p, and therefor making the point that 720p is
better. But that's only true if the source is interlaced at 50Hz and you
freeze the frame or you try to perform a sloppy deinterlace, that'll give you
half the resolution.
But if we're talking about movies shot progressively (or on film), and your TV
can handle interlaced inputs and truly display the fields as intended, 1080p
and 1080i are completely equal. 1080p25 contains the same amount of info as
1080i50, which shouldn't be a surprise. Blu-Ray movies uses 1080p24, that's
even less than todays HDTV-standards, but the bit-rate is much higher, two or
three times higher. So theoretically speaking, you may as well broadcast movies
and progressive 24/25-material in 1080p - same amount of info.
You can inverse-telecine 1080i to 1080p without loss, and it really should be
the preferred format in all situations except sports, where you might want to
use the 50p for slow-motion playbacks.
I have both 720p and 1080i channels at home, 1080i is the clear winner in my
book :)
On 4/6/07, John
Morgan <John.Morgan(at)slcc.edu>
wrote:
1280x720 (at) 60fps is legitimate. It's referred to as "720p",
or if frame
rates are mentioned, 720/60p or 720/24p. 720/24p is very common. There are
no interlaced options in 720p.
The arguments about 720p being "half HD" are false. When you compare
the
quality of 1080i vs 720p, considering one field of 1080i (1920x1080
interlaced) is only "half" a field by virtue of interlacing, the
outcomes
are nearly equal.
Half the broadcast industry uses 720p because the data rate allows other
control signals (such as On Demand interaction) to be pushed down the pipe.
That said, the other half of the broadcast industry thinks 1080i rules. But
the REAL winner is 1080p. Broadcasters aren't using 1080p yet, but some
Blu-Ray/HDDVD titles will eventually go that route.
John
-----Original Message-----
From: owner-xsi(at)Softimage.COM
[mailto: owner-xsi(at)Softimage.COM]
On Behalf Of
digimata
Sent: Thursday, April 05, 2007 8:44 PM
To: XSI(at)Softimage.COM
Subject: 720i
Is 720i (1280x720 interlace) a legitimate video format?
Just about to render a 1280x720 project in XSI, it defaults to
progressive (60 frames a second)
Thanks,
Leoung
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