12fps video to 24fps video without speed change

[Brian Przypek]

Yep 23.976 got that.
Lazy use of “24” on my part.
Thanks your tip it was helpful.
Maybe a little frame blending might help?

[Kevin Camp]

if the goal is to have the 12fps footage look like 12fps footage, then you wouldn’t need frame blending.

if the goal was to make 12fps footage look like 24fps footage, then you’d want to try frame blending… but as dave eludes, having ae generate entirely new frames based on pixels from 2 different frames does not always work as well as you might hope…

another option would be to try the timewarp effect. it also offers frame blending based on pixel motion, but has options for tweaking how pixel motion is used to create new frames.

the basic setup for timewarp are a bit different. to start you’ll drop the 12fps footage into a 12fps comp. in this case you’ll want to make the comp 2x as long as the footage. then apply timewarp and set the speed to 50% (this of course slows it down, but you’ll speed it up later). this will generate new frames as it stretches out the duration of the clip.

you’ll also need to extend the outpoint of the footage layer. to do that, enable time remapping for the footage layer (layer>time>time remapping) and drag the outpoint of the layer out (don’t modify the keyframes for time remapping, just the outpoint).

at this point you’ll want to start looking at the interpolated frames and making tweaks to setting in the timewarp effect… in particular the settings for vector detail, filtering and error threshold. for descriptions of the controls see this page:

https://help.adobe.com/en_US/AfterEffects/9.0/WS641C5190-1DAD-4150-B17F-F339C6DF1FB2a.html

after that, you can take that comp into a new 24fps comp that is the duration of the original footage and set time stretch to 50% so the 12fps, slow-mo comp should now be 24fps, realtime speed.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Vincent Boileau]

Kevin,

3 years later, I’ve found your post to be incredibly helpful. I got some 10fps spinning CAD renders from a client and wanted to smooth them out. Using the timewarp method worked marvelously.

Thanks very much!