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Topic: What is the acceptable tolerance from exactly 24 fps for motion pictures?

Martin Brooks
Jedi Master Film Handler

Posts: 900
From: Forest Hills, NY, USA
Registered: May 2002

posted 09-22-2017 07:09 PM

quote:
Quite a few exhibitors in europe followed a bad habit of operating their machines at 25fps in order to squeeze out a few minutes per day, and obviously, SRD and DTS was able to follow.

I once overheard a couple at an exhibitor conference complaining that this is no longer possible with DCI ;-)

I doubt that very much. The difference between 25fps and 24fps is 3600 frames over the course of an hour which is 144 seconds at 25fps. So 4.8 minutes over the course of 2 hours. They could accomplish the same thing by running shows 5 minutes closer together or playing one less trailer. And if they ran shows at non-odd times, like 12, 2:30, 5, 7:30, 10, they'd only be saving anything on the last show and that would only be less than 5 minutes. So if they were doing it, it was nonsensical.

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Pete Naples
Phenomenal Film Handler

Posts: 1565
From: Dunfermline, Scotland
Registered: Feb 2001

posted 09-26-2017 04:30 AM

That definitely went on, some circuits here had Kinoton/Phillips with VFD and usually those had a switch somewhere inside which allowed 25fps.

That nearly 5 minutes might mean catching your bus home, or more likely catching last orders at the pub [Wink]

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Marcel Birgelen
Film God

Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012

posted 09-26-2017 05:36 AM

quote: Martin Brooks
I doubt that very much. The difference between 25fps and 24fps is 3600 frames over the course of an hour which is 144 seconds at 25fps. So 4.8 minutes over the course of 2 hours. They could accomplish the same thing by running shows 5 minutes closer together or playing one less trailer. And if they ran shows at non-odd times, like 12, 2:30, 5, 7:30, 10, they'd only be saving anything on the last show and that would only be less than 5 minutes. So if they were doing it, it was nonsensical.

Yep, it actually happened and I be damned it didn't happen outside of Europe either.

Maybe Europeans were more used to the higher pitched voices, since most film to PAL and SECAM conversions happened by speeding it up to 25fps. So, they simply compensated for the audience expectations. [Wink]

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Sascha F. Roll
Expert Film Handler

Posts: 140
From: Berlin, Berlin / Germany
Registered: Sep 2015

posted 09-26-2017 08:56 AM

At the Multiplex I was working 10 years ago all Lenze Frequency Converters in the Ernemann 14s were set to 52Hz...

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Gary A. Hoselton
Film Handler

Posts: 59
From: Portland OR U.S.A.
Registered: Nov 2005

posted 10-02-2017 10:03 PM

Last month I changed motor drive belt on 16mm Eiki EX-6000. Program was "The Cheyenne Social Club"(1970). Two weeks later a fellow asked me if I had speeded the show. I hadn't noticed, but opened case and found I'd inadvertently put belt on 50Hz pulleys instead of 60Hz, with 60Hz mains. I am still puzzled that I did not notice change in picture and sound.

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