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Posted by ~P~ on 04/15/06 16:01
??? - You are saying that film isn't stored on DVD at 480/24i?
This goes in direct contrast to what the link YOU provided states and which
I quoted.
I am not sure what the MPEG2 header says - or what that has to do with what
is actually put on the disc itself - do you have any links or quotes from
articles that has something to do with the header - since the very detailed
page you linked to doesn't talk about the header at all. I can assure you
that DVD players pull off the frames in a flagged sequence that is
specifically called 3:2 pulldown or 2-3 pulldown (depending on where you
read it). Either way, this work is performed by the DVD player processing.
It is not encoded on the disc this way, it is just flagged as 24fps based
material and requires 3:2 pulldown to be performed. A progressive scan
player must go even further to recombined the frames with inverse telecine.
None of that is on the DVD natively, but is flagged, then performed by the
DVD player.
HD-DVDs, encoded at 24fps - PROGRESSIVE - outputting progressive, will do
about the exact same work that a current DVD player does when it comes to
setting up frames: Frame 1, repeat frrame 1, repeat frame 1, frame 2,
repeat frame 2, etc., etc. They may use a lot more processing to get the
image to look even better though.
Think about upconverting DVD players and what they must do to get the video
to where it needs to be for 1080i or 720p output and do it well. Those
players are 200 bucks or less quite often, yet have no issues doing the
work.
If my information is poor, then show me some links that confirm what you are
saying that specifically go against what I am saying. I am not talking
about television shows which are shot at 480i. I am talking about films,
which are shot at 24fps and then transferred to film. This is what most
DVDs are - films put to disc. So, while there is normal 480i material on
DVDs, it is not what you will find if you were to look frame-by-frame at
what is actually on the disc. What you would see is 480/24i material.
"Jeff Rife" <wevsr@nabs.net> wrote in message
news:MPG.1ea99fbccbe6639e98a46f@news.nabs.net...
~P~ (bmxtrix2005@cox.net) wrote in alt.tv.tech.hdtv:
> I don't know why you call 480i/24 - psuedo 24 frame encoding.
Because the MPEG-2 header says "29.97 fps". That's the output rate,
and that's what the data is encoded for. If the header said "24 fps",
then in order to output 60i, the decoder would have to do some real work.
Instead, the decoder merely says "what's the next field? OK, output it".
Any pulldown has already been done by the encoder, so the player doesn't
have to do any work, just as I said, and exactly the opposite of what
you said.
On the other hand, if HD-DVD and Blu-Ray are encoded at 24 fps for movie
material, then the player *will* have to do a *lot* of work to output
either 60i or 60p.
--
Jeff Rife | "I'll be back in five or six days."
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| "No, you'll be back in five or six pieces."
| -- "The Lost World"
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