Converting 23.976 to 25fps?

[Kevin Camp]

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

[Kevin Camp]

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

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Brandon Adam]

[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.

[Kevin Camp]

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

[Brandon Adam]

Thank you Dave and Kevin. Worked perfectly.

[Nancy L. sutton smith]

I apologize, I don’t think I explained myself correctly. When I ran a ProRes HD 25 export test (changing a 23.976 mov to ProRes 422 1080p 25), the duration didn’t change on the clip. I don’t understand how, if I am changing 23.976 to 25fps, the time doesn’t change on all types of exports. I also just discovered that the PAL DVDs I made also didn’t change duration. Is the MPEG2DVD conversion compensating for the frame loss?

I am also doing exactly what you all said to do, interpret the footage to 25fps in AE (an hour and a half movie is 3+ minutes shorter) and Stretch & Pitch an HQ Wav in Audition and then sync them up.
But why does the AE process change the duration when the automatic DVD Encore PAL process maintains the runtime, quality, and audio?

Nancy L. Sutton Smith
Northeast Community College
Mass Media/Journalism/Post Production Instructor
Sutton Bay Media Company

[Nancy L. sutton smith]

The Adobe forum answered me for anyone else having this issue:
As you have found out, Interpret footage in either AFX or Premiere will play out the same number of frames but at 25 per second rather than 23.97 per second which is why it runs shorter. When you ‘export’ at a different frame rate a standards conversion will take place, for each second Premiere will add an extra frame and a bit, for some types of footage this is noticeable on other types it looks ok. Traditionally when converting from film frame rates to 25fps PAL the film is just played faster and the sound is also played faster. I would ask the channel which method they would prefer.

Nancy L. Sutton Smith
Northeast Community College
Mass Media/Journalism/Post Production Instructor
Sutton Bay Media Company