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Converting 23.976 to 25fps?

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Brandon AdamConverting 23.976 to 25fps?
by on Jan 8, 2014 at 3:28:01 am

I have a H.264 file at 720p 23.976 that needs to be converted to 25fps 1080 by 1920. Can it be as simple as importing the file into a comp set to 25fps?

Thank you CC.


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Kevin CampRe: Converting 23.976 to 25fps?
by on Jan 8, 2014 at 5:01:04 pm

you'll also need to change the speed of the footage to 25fps. the adobe manual describes 2 methods to convert 25p to 24p (http://helpx.adobe.com/en/after-effects/using/converting-movies.html#conver...), you'll just need to do the reverse.

one method is to simply use the interpret footage settings to change the frame rate from 23.976 to 25, and put that into a 25p comp. note, this will cause some audio sync issues.

the other is to drop the 23.976 footage into a 25p comp then time stretch it 104.709% (25/23.976). note, this will change the pitch of the audio.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Brandon AdamRe: Converting 23.976 to 25fps?
by on Jan 9, 2014 at 12:01:51 am

[Kevin Camp] "the other is to drop the 23.976 footage into a 25p comp then time stretch it 104.709% (25/23.976). note, this will change the pitch of the audio.
"


Thank you all for your replies. How can I change the pitch of the audio back to its original?

Thanks.


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Kevin CampRe: Converting 23.976 to 25fps?
by on Jan 9, 2014 at 8:50:31 pm

i don't know of a way to do it in ae, at least not with the standard effects. some nle's will allow you to stretch audio but keep the correct pitch.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Dave LaRondeRe: Converting 23.976 to 25fps?
by on Jan 9, 2014 at 11:37:27 pm

Having been the one to say, "Do it with hardware," I now recommend a free audio editing application called Audacity.

If you like the way software treats your video, Audacity ought to do the trick for you with audio: you can change an audio file's duration and NOT fchange pitch, then export out a new, corrected audio file.

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


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Brandon AdamRe: Converting 23.976 to 25fps?
by on Jan 10, 2014 at 12:32:15 am

Thank you Dave and Kevin. Worked perfectly.


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Dave LaRondeRe: Converting 23.976 to 25fps?
by on Jan 8, 2014 at 5:20:22 pm

Or take it to a production house with a terranex box to do a hardware frame rate conversion.

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


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Kevin CampRe: Converting 23.976 to 25fps?
by on Jan 8, 2014 at 6:01:03 pm

a hardware conversion will also do a better job of up-rezing the footage.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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