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29.976 frame slide with timers

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Federico Ponce29.976 frame slide with timers
by on Dec 13, 2013 at 10:47:20 pm

HI greetings,

We are working with timers. Matching AE timers to burned in footage timecode. The footage is 29.97 and we have noticed that every 5 seconds our timers skip 3 frames. We are using Dan Ebberts, timer expression but we have also tried the default after effects timer with no positive results.


Can anyone provide a solution to this? Thank you !


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Dave LaRondeRe: 29.976 frame slide with timers
by on Dec 13, 2013 at 11:32:48 pm

What is the frame rate of your composition?

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


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Federico PonceRe: 29.976 frame slide with timers
by on Dec 13, 2013 at 11:34:44 pm

Hi Dave,


Thanks for the quick reply. The comp is 29.976 and we have tried interpreting the footage with and without drop frame.


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Dave LaRondeRe: 29.976 frame slide with timers
by on Dec 13, 2013 at 11:52:21 pm
Last Edited By Dave LaRonde on Dec 14, 2013 at 12:16:44 am

29.976 is not a valid frame rate in NTSC. If you are trying to give 29.97 footage the NTSC film frame rate of 23.976, I don't recommed simply putting it into an AE comp. You will get an uneven frame cadence.

You will have to do a frame rate CONVERSION, which is not the the same as conforming footage in AE's Interpret Footage settings. To do the conversion in AE, I recommend using Twixtor.

And also please note that you will NOT get a direct correspondence between frames, but if you do the frame rate conversion properly, the duration of the footage will not change from the original 29.97 footage.

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


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