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loose sync when converting from 25fps to 24fps

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Charles Stewart
loose sync when converting from 25fps to 24fps
on Oct 31, 2014 at 12:01:35 am

How do I convert a sequence from 25fps to 24fps. When I do it I loose sync


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Dave LaRonde
Re: loose sync when converting from 25fps to 24fps
on Oct 31, 2014 at 2:03:37 am

Do you want the resulting video & audio to be 4% slower than the original, or the exact same duration?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Charles Stewart
Re: loose sync when converting from 25fps to 24fps
on Oct 31, 2014 at 11:47:08 am

I filmed at 25fps and then had an offer of very limited cinema distribution in the UK and possibly elsewhere. I have made a surround sound (5.1mix) and they made a 24 fps version which I understand is shorter by 4%.

The pitch has been corrected

regards charles


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Dave LaRonde
Re: loose sync when converting from 25fps to 24fps
on Oct 31, 2014 at 9:35:31 pm

Ah, there are delivery specs involved! What are they? What frame rate do they need, 24 or 25?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Michael Gissing
Re: loose sync when converting from 25fps to 24fps
on Nov 1, 2014 at 6:17:54 am

DCP in cinemas can be 25fps so no need for a 24 frame version. If 24 is required then use Cinema Tools to change the final quicktime file from 25 to 24 which slows it by 4%. Then you need someone with the right software (eg: MPEX3, iZotope RX advanced) to change the duration by exactly 25 to 24 and correct the pitch. So you should not be changing an FCP sequence. Do it all outside of FCP.

If all that is done correctly the elements will sync perfectly. I used to do it all the time but since the DCP spec was changed a few years ago it is now OK for 24, 25, 30 and 48 frames per second with a DCP.


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Charles Stewart
Re: loose sync when converting from 25fps to 24fps
on Nov 1, 2014 at 12:40:42 pm

Dear Michael,

Thank you do very much for your information, I had no idea that the DCP could be at 25fps, and nobody told me, until you. Such a load off my mind, and a saving in thevbudget too.

So thank you,

regards Charles


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Charles Stewart
Re: loose sync when converting from 25fps to 24fps
on Nov 1, 2014 at 11:59:49 am

I filmed at 25fps and then had an offer of very limited cinema distribution in the UK and possibly elsewhere. I have made a surround sound (5.1mix) and they made a 24 fps version which I understand is shorter by 4%.

The pitch has been corrected

regards charles

I want is to be 4% slower.


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