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The mathematics of slow mo


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#1 Ewan Macleod

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Posted 06 June 2007 - 10:44 PM

Hi all, glad to join the site.

I'm working with a cinematographer on a music video in the next few days. we are shooting in super 16mm in a studio with a steadycam and it is a one shot clip.

We are intending to shoot the whole thing at a frame rate of 33.3fps to acheive a little bit of a surreal slowness to movement.

To get the band to perform in sync im wondering what percentage should they speed the song up and put it onto DAT tape??

cheers, ewan.

Edited by Ewan Macleod, 06 June 2007 - 10:44 PM.

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#2 Nick Mulder

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Posted 06 June 2007 - 11:22 PM

sheesh !

33.3 / your output fps = answer

eg. for 24fps

33.3/24 = 1.3875
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#3 Ewan Macleod

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Posted 07 June 2007 - 12:19 AM

sheesh !

33.3 / your output fps = answer

eg. for 24fps

33.3/24 = 1.3875



cool. thanks, yeah i thought it was that.

our output is 25fps so 33.3 / 25 = 1.332 so

the song which is 4mins 12 seconds is compressed by 133.2% yeah ?

Edited by Ewan Macleod, 07 June 2007 - 12:20 AM.

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#4 Nick Mulder

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Posted 07 June 2007 - 02:02 AM

cool. thanks, yeah i thought it was that.

our output is 25fps so 33.3 / 25 = 1.332 so

the song which is 4mins 12 seconds is compressed by 133.2% yeah ?

not sure of the terminology of whatever software you are using there, but I'm sure with a bit of plodding this way and that you'll sort it out...

252 / new time = 1.332

>> new time = 189 sec (3 min 9 sec)

make it so scotty !
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#5 Ewan Macleod

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Posted 07 June 2007 - 08:46 AM

not sure of the terminology of whatever software you are using there, but I'm sure with a bit of plodding this way and that you'll sort it out...

252 / new time = 1.332

>> new time = 189 sec (3 min 9 sec)

make it so scotty !

Thanks Nick. I dp need to check this out further as we dont really have stock to experiment with.

Cheers for the help.

It sounds right!!! But any mathematicians on the site?
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#6 Nick Mulder

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Posted 11 June 2007 - 03:06 AM

Thanks Nick. I dp need to check this out further as we dont really have stock to experiment with.

Cheers for the help.

It sounds right!!! But any mathematicians on the site?

I've done a few years at uni - engineering drop-out to be exact ...
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#7 Ewan Macleod

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Posted 11 June 2007 - 11:26 AM

I've done a few years at uni - engineering drop-out to be exact ...


nice one. Im a digital film making graduate but still owe the college 1k for late assignment submissions.

we ending up shooting at 37.5fps - 150% speed up when coming from and going back to 25fps..

also one at 50fps - 200%
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