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Activity Forums Adobe After Effects 24fps to 30 fps…wahts the speed numbers?

  • 24fps to 30 fps…wahts the speed numbers?

    Posted by Bob Flood on July 20, 2005 at 6:07 pm

    hi all you AE’ers

    here is a quick question that i hope has a quick answer:

    what value do i enter in “time stretch factor” to speed up 23.97 VIdeo (from a panasonic ag dvx 100) to NTSC 29.97?

    or if thats too easy, whats the math to figger it out for my own sef!

    thanx people !

    bee eph

    No Urizander replied 11 years, 6 months ago 4 Members · 6 Replies
  • 6 Replies
  • Terry Hahin

    July 20, 2005 at 6:25 pm

    Instead of using the time stretch, try the “interpret footage” box. That’s what I would do.

  • Bob Flood

    July 20, 2005 at 7:08 pm

    hi

    thanx dave! actually the pull down has not been removed! what the dvx100 does is shoot at 24(or 23.97) BUT lays it onto tape at 29.97 interlaced.

    the “guessed” interploation that AE put on my test clip is WWWSS.

    what i want to do is, once the stuff is interpreted, speed it up to 29.97 so i will have a one to one relationship between the 23.97 video frames and the 29.97 video frames

    (i realize some of the frames might only be a field, but i can deal with that)

    in other words, we used to transfer 24 fps footage (16 or 35) at 30 fps, treat it/effect it/speed it up or slow it down/then put the 3:2 cadence back in for mastering. so i am trying to replicate that here

    so thats why i wanted to know the value of speed change, and make sure its exact, since AE will blur footage slightly if speeds / frame rates are even a little off.

    BTW using AE 5.5 on PC winnt

    bee eph

  • Jonathan Miller

    July 20, 2005 at 7:28 pm

    I’m confused here.

    It sounds like you used to transfer film to video, digitize the video then edit/add effects (after removing pulldown) and then master back to tape by adding pulldown?

    Well, that sounds fine. So why would you want to speed your footage up to 30fps so there’s a 1 to 1 frame for frame conversion for 24fps to 30fps?

    If I was you, I would remove the pulldown in AE to get a 23.976 (also known as 23.98 or 24p) clip, put that in a 23.98 fps timeline, do what you’d like to the video, then render out adding 3:2 pulldown to bring the footage up to 29.97 for printing to videotape.

    Jon

  • Bob Flood

    July 20, 2005 at 8:14 pm

    thanx johnathan

    i suppose i could try that(doing a comp at 24)

    but i want to make a 1 to 1 frame relation ship so i can bring the footage back into my nle (now at 30 fps, actually 29.97) and slow it down to whatever speed i want, giving me some flexibility on the editing side.

    i am using an older NLE to edit a show that was all shot on the dvx100. when i start to slow down shots for better studying of the content (its a training video) i get motion artifacts from the 3:2 pulldown inherent in the footage. SO i was trying to remoce the cadence

    its a better workflow for me to have the stuff at 30.

    and i really appreciate all the great advice everyone has given me, but i really just want to know the number, or where i could find out?

    bee eph

  • Bob Flood

    July 20, 2005 at 9:29 pm

    wow!

    what an awesome bunch of choices.

    i think you got what i am trying to do

    also, here is a link for what i was looking for (i am kinda under the gun w this, so i was looking at as mant resources as possible)

    https://www.24p.com/conversion.htm

    the table that i need is the last one!

    thanx again

  • No Urizander

    October 9, 2014 at 7:27 pm

    FYI… the percentage difference between 24fps and 30 fps is 80%. Hope that answers that.

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