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12fps video to 24fps video without speed change

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Brian Przypek12fps video to 24fps video without speed change
by on Jan 20, 2011 at 8:52:13 pm

Is it possible to convert 12 fps video to 24 fps video without a speed change in AE and without an expensive plug-in?
Any help would be appreciated.
This is in regard to time-lapse footage I shot that looks great at 12 fps but moves too quickly at 24 fps.


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Dave LaRondeRe: 12fps video to 24fps video without speed change
by on Jan 20, 2011 at 10:10:12 pm

[Brian Przypek] "Is it possible to convert 12 fps video to 24 fps video"

24 fps isn't a VIDEO frame rate; it's a FILM frame rate. You want to play back at a film frame rate on a video screen? Your comp had better be at 23.976 frames/sec.

Then highlight that footage and use the Interpret Footage command. Change the frame rate of this footage to 23.976/2 fps, and add it to your comp.

When you view the rendered file, it will be at 23.976, and you will see two identical frames in a row. It'll be at the frame rate you want, but the motion won't look very smooth. You didn't say anything about smooth motion, something that's unattainable from 12 fps footage.

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


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Brian PrzypekRe: 12fps video to 24fps video without speed change
by on Jan 20, 2011 at 11:51:44 pm

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?


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Dave LaRondeRe: 12fps video to 24fps video without speed change
by on Jan 21, 2011 at 3:52:30 pm

Using Frame Blending will be more a matter of personal taste than anything else. Give it a shot on a small section with a lot of motion in the image and see what you think.

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


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Kevin CampRe: 12fps video to 24fps video without speed change
by on Jan 21, 2011 at 6:15:49 pm

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:

http://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


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Vincent BoileauRe: 12fps video to 24fps video without speed change
by on Feb 5, 2014 at 2:09:00 pm

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!


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