What is 24p? at DVinfo.net

Go Back   DV Info Net > Special Interest Areas > Techniques for Independent Production

Techniques for Independent Production
The challenges of creating Digital Cinema and other narrative forms.


Reply
 
Thread Tools Search this Thread
Old June 19th, 2003, 03:57 AM   #1
Regular Crew
 
Join Date: Feb 2003
Location: UK
Posts: 130
What is 24p?

Is it 24 frames per second? And if so, why is it so important? Can't films stay at their 29.9 fps to look good?
Any info would be great.

Thanks
Stewart McDonald is offline   Reply With Quote
Old June 19th, 2003, 04:17 AM   #2
Outer Circle
 
Join Date: May 2002
Location: Hope, BC
Posts: 7,527
Film plays at 24fps. But when shooting film, the speeds vary: higher speed capture for slow motion, lower speed capture for fast motion. 29.97fps is the NTSC broadcast frame rate---but the frames are split in half as odd and even fields. PAL, SECAM and MESECAM are 50 fields per second, except for Brazil---more or less.
Frank Granovski is offline   Reply With Quote
Old June 20th, 2003, 11:47 AM   #3
New Boot
 
Join Date: May 2003
Location: Temecula, CA
Posts: 5
24p stands for 24 'P'rogressive (FULL) Frames Per Second
Whereas something such as 60i would be 60 'I'nterlaced frames per sec.
Cazi Brasga is offline   Reply With Quote
Old June 21st, 2003, 07:31 AM   #4
Major Player
 
Join Date: Apr 2002
Location: Stockholm, Sweden
Posts: 331
Stewart. You're in the UK. Either Film nor Video is 29,97fps where you're at. It's 25fps in video and shot 25fps on film (but projected 24fps). We all work in 25p in Europe :)
__________________
Martin Munthe
VFX Supervisor/DP/Director
Martin Munthe is offline   Reply With Quote
Old June 22nd, 2003, 06:35 PM   #5
Regular Crew
 
Join Date: Apr 2003
Location: Norway
Posts: 35
Maybe somewhat off subject, but I had a discussion recently on how film is projected so that there wonīt be any flickering since itīs coming at 24 frames per second. Iīve heard that each frame is projected twice, but Iīm not quite sure if thatīs how they do it. Anyone?
__________________
Eivind Vaa
Eivind Vaa is offline   Reply With Quote
Old June 23rd, 2003, 09:29 PM   #6
Regular Crew
 
Join Date: May 2003
Location: Madison, WI
Posts: 123
<<<-- Originally posted by Martin Munthe : We all work in 25p in Europe :) -->>>

Not true. Most of you across the pond work with 50i. Big difference from 25p. Only those using "frame mode" on their XL1 or the DVX100 in 25p mode are working in 25p.

Also, while 25p might look a lot like 24p, it is tricky doing a film transfer from 25p to 24p -- that's a 4% difference, which requires audio pitching and your feature runs a few minutes extra compared to the video version.

///d@
Dennis Adams is offline   Reply With Quote
Old July 11th, 2003, 06:34 AM   #7
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
I think Martin was referring to FILM here.... If I'm not mistaken
that is SHOT and PROJECTED at 25p in Europe.
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old July 11th, 2003, 08:29 AM   #8
Major Player
 
Join Date: Apr 2002
Location: Stockholm, Sweden
Posts: 331
Rob. It's actually shot and edited in 25 But it's projected 24 (most older projectors can only project 24).

And yes; I'm aware that Europe is 50i.
__________________
Martin Munthe
VFX Supervisor/DP/Director
Martin Munthe is offline   Reply With Quote
Old July 15th, 2003, 09:48 AM   #9
Major Player
 
Join Date: Aug 2002
Location: Phoenix, AZ
Posts: 202
50i = 25p

Martin is correct. It's pretty well known that voices in European films are heard a fraction of an octive higher due the the 1 fps accelleration. It is considered a waste of time to convert the format from 25fps (50i) to 24fps for projection.

My only question is, why don't they just modify the projector???
(This is a redundant question the does not warrant an answer)
Alex Dunn is offline   Reply With Quote
Old July 16th, 2003, 04:25 AM   #10
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
Well, 50 fields per second is 25 frames per second. But it isn't
the same due to time difference in the fields.
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old July 16th, 2003, 08:05 AM   #11
Regular Crew
 
Join Date: May 2003
Location: Madison, WI
Posts: 123
People are always claiming that film is shot and/or edited at 25 fps in Europe, but I've yet to find a verifiable source of this informaiton. I contend that it is not. It is shot and edited at 24 fps just like the rest of the world. The only time 25 fps comes into play is during a PAL tranfer, where it is sped up 4% and the audio re-pitched accordingly (I'm well aware of the process, we used to have a division that did format conversions). If you want to argue about it, provide some legitimate sources.
///d@
Dennis Adams is offline   Reply With Quote
Old July 16th, 2003, 09:44 AM   #12
Major Player
 
Join Date: Aug 2002
Location: Phoenix, AZ
Posts: 202
Oops, that's what I meant. I said it backwards. Sorry!! I was also not aware of the audio re-pitch, I have always heard they don't bother.
Alex Dunn is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Special Interest Areas > Techniques for Independent Production

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:29 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network