-

Jump to content



Photo
- - - - -

Why so few sets capable of 24p?


This topic has been archived. This means that you cannot reply to this topic.
3 replies to this topic

#1 of 4 OFFLINE   Brian W.

Brian W.

    Screenwriter

  • 1,958 posts
  • Join Date: Jul 29 1999
  • Real Name:Brian
  • LocationLos Angeles

Posted November 12 2007 - 04:22 PM

Even the new batch of HDTVs, very few of them seem to have 24p capability, at least as I see listed in the specs. Sony seems to be an exception. Why is this?

EDIT: I will say I see "24hz" on a lot of them. Is that the same thing?

#2 of 4 ONLINE   Patrick Sun

Patrick Sun

    Studio Mogul

  • 37,756 posts
  • Join Date: Jun 30 1999

Posted November 13 2007 - 12:56 AM

Yes. Same thing. You still need to mate that 24hz HDTV with a high-def player that is capable of outputting 1080p24hz, and choices in players with that capability are small at the moment, or require a firmware update for some of the players.
"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
Patcave | 2006 Films | 2007 Films | Flickr | Comic-Con 2012 | Dragon*Con 2012

#3 of 4 OFFLINE   Allan Jayne

Allan Jayne

    Screenwriter

  • 2,406 posts
  • Join Date: Nov 01 1998

Posted November 13 2007 - 04:03 AM

24p (24 frames per second; 24 Hz) is a newcomer to the gamut of different video signal formats used to go between consumer video devices such as TV's and DVD players.

Video hints: http://members.aol.c...ynejr/video.htm

Actually the TV still displays at 60 fps or thereabouts (e.g. 72 fps). Incoming 24 fps signals are converted using 3-2 pulldown etc. to match the display's frame rate.

Also, 24 fps is not well suited for non-film sources and ideally the source device will switch back and forth as needed and the receiving device wil autoselect the frame rate each time it changes.

In addition to the different "resolutions" 720p, 480p, etc. 24 fps comes in two distinct flavors, "psf" or "segmented frame" with assumable pre-matched interlacing fields, and "p" real progressive.

24 fps progressive consumes less bandwidth and storage space than comparable 30 fps interlaced video. Since 1080p@60 won't be seen in HDTV broadcasts, 1080p@24 which is one of the ATSC HDTV formats, and which carries film source just as well as 1080i@30, will be seen more often in the future.
.

#4 of 4 OFFLINE   ross ish

ross ish

    Stunt Coordinator

  • 162 posts
  • Join Date: Nov 18 2002

Posted November 25 2007 - 05:37 PM

Although there seems to be an obvious advantage to not having to do the 3:2 pull down; there are a lot of good tvs out there that do an excellent job of 3:2 pull down making the 1080p24 moot; more of a marketing ploy like the 120mhz theme.