true 24p to 23.98 conform

You're going to have audio problems if you change the frame rate: the sound will slowly drift out of sync.

After Effects defaults to importing image sequences to 30 frames/sec. It can be changed in AE preferences, I believe.

Here's the proper method you want: Import the sequence. In the interpret footage settings, change the sequence's frame rate to 23.976. Put the footage in a 1920x1080 23.976 comp.

Because you changed the frame rate, the comp will now be slightly linger than than the original 24fps footage. You'll have to talk to your audio people about changing the duration of the 5.1 surround audio.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

Sorry, I missed the ProTools part.


You have to get to 23.976 eventually, so you may as do it the very best way you can, right from the start. That would be to interpret the sequence as 23.976. You gain absolutely nothing by interpreting as 24 and placing it in a 23.976 comp.

Wait, that's wrong, you DO gain something: you gain erratic motion problems in the final render due to the frame rate mismatch.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

[Anhtu Vu] " AE conforms differently when you do it in the interpretation stage or comp stage or render stage ??? "

The ONLY time AE conforms is in the Interpret footage stage. That's why you do it then.

[Anhtu Vu] "...or... Interpret as original 24p, put it in a 24 p comp then render out as 23.976.."

Once the comp is in the Render Queue, AE won't change its frame rate. Try it and see. This is why you interpret as 23.976 and render in a 23.976 comp.

Don't fight City Hall on this one. You may think AE should work differently, but it doesn't. Go with the flow and have a much better AE experience.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

A similar issue was covered recently in another thread about 24.0 vs 23.976 fps [link].



[Anhtu Vu] "once the comp is in the queue, there's a box where you can change the frame rate..and that's where i changed it to 23.976 and as i said the end result looked the same as if i was to change the frame rate at the interpret stage as suggested."

This is not the right way to do it. Consider what's happening -- you have a source footage item that has 24.0 frames every second, and you are sampling it at 23.976 frames per second for render. You are not changing the duration, which means you have to squeeze 24000 frames on the source side (over 1000 seconds) into 23796 frames on the output side. To do this, you must skip 24 frames every 24,000, or one frame per thousand.

By interpreting the footage at 23.976 fps, you preserve all your original frames, but alter the total duration slightly.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events

Anhtu

Go to Edit> Preferences > Import and change the default Sequences Footage Frame Rate as required.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

Demo Reel(3D):