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Thiago_P__S_
Participant
March 22, 2017
Question

Footage 50fps on a 24fps sequence

  • March 22, 2017
  • 4 replies
  • 31416 views

Hi guys,

Basically I recorded all these videos on a 1080p 50fps setting, JUST IN CASE I want to do some slow motions in post.

But I want to edit and export my project on a 24fps.

It happens that majority of the footage I DO NOT want to create slow motion.

Is it ok to just drag all these 50fps videos straight to the 24fps sequence and export it as such?

Or do I need to Interpretate all the 50fps footage to 24fps, drag to the sequence, and increase the speed of these videos there?

Really appreciate your help.
Thanks in advance.

Thiago

4 replies

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Tatiana26738509vt2b
Participant
July 19, 2023

To calculate how many percent you can slow down your footage, you need to compare the frame rates of your footage and the sequence.

Given:

  • Footage frame rate (fps): 50
  • Sequence frame rate (fps): 24

To find the percentage you can slow down the footage, follow these steps:

  1. Calculate the slowdown factor: Slowdown factor = Sequence frame rate / Footage frame rate = 24 / 50 = 0.48

  2. Calculate the percentage: Percentage slowdown = (1 - Slowdown factor) * 100 = (1 - 0.48) * 100 = 52%

So, you can slow down your 50 fps footage to approximately 52% of its original speed to match the 24 fps sequence.

A
aliciaw59415729
Participant
October 30, 2024

I wanted to add to this. When you adjust the "speed/duration" in Premiere, set it to 48% to smoothly change 50 fps to a 24 fps sequence.
When I set it to 52% there was a judder. Setting it to 48% makes it as smooth as glass.

    MacJedigirl
    MacJedigirl
    Participant
    May 3, 2018

    I have the perfect answer for you but the result will give you a half speed slow motion but it will perfectly conform smoothly.

    50 FPS is conformed to function perfectly on a 24 FPS timeline by applying exactly a 48% speed decrease towards slow motion in order to create an exact match frame for frame.  If you want to avoid slow motion, you will need to increase (convert / render) the frame rate of the 50 FPS first to 100 FPS, then drop onto your time line and apply the 48% speed drop to achieve a 48 FPS clip.  This 48 FPS clip will conform as 2 frames per each 24 frame and will conform without strange anomalies.

    E
    excited_Genie16B8
    Legend
    March 22, 2017

    I recommend using a 25 fps sequence, rather than 24.  The math works better.

      T
      Thiago_P__S_Author
      Participant
      March 23, 2017

      Noted. Thank you very much Jim!!

      Is there any big difference in the final results having an exported project in 25 or 24 fps?
      Or it's really just about matching 50 - 25 fps and 60 - 24 fps?

      Ann Bens
      Community Expert
      Ann BensCommunity Expert
      Community Expert
      March 23, 2017

      So-called PAL framerates in a NTSC sequence is a big pita.

      I would stick to 25 and 50.

      gerikp
      Community Expert
      gerikpCommunity Expert
      Community Expert
      March 22, 2017

      Hey Thiago.

      I'm sure there are valid reasons why this isn't a good idea. But truth be told, I do this all the time. I shoot 60p footage and then drop the 60p footage straight in to a 24p timeline.

      If I end up wanting change a clip to slow motion I find the best result is to duplicate the clip in the Project Panel. Then I control+click the duplicate footage and choose Modify > Interpret Footage and Change it to "Assume this frame rate:" to 24p.

      Cheers.

        T
        Thiago_P__S_Author
        Participant
        March 23, 2017

        Thank you so much!!

        Have you noticed anything weird in the exported project doing that? Or it still looks as smooth as if you had recorded with 24 fps?

        Cheers!!

        gerikp
        Community Expert
        gerikpCommunity Expert
        Community Expert
        March 23, 2017

        In a perfect world you would ideally have your frame rates all be the same as your timeline. You'd shoot your regular footage in 25Pp and your slow-motion in 50p and then interpret that 50p footage down to 25p.

        For what I do and for where my projects end up, I've not noticed any thing weird in mixing frame rates in my timelines. In fact I think Premiere Pro handles mixed frame rates really well.

        Reading through your posts I can't help but wonder about you interchanging the words "50p, 24p, 25p, and 60p" frame rates. I don't want to assume your level of skill but you might do some research on PAL and NTSC video standards and how that correlates to frame rates. You should choose the appropriate standard for your project and then adhere to the frame rates for that standard.

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