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BibbidiBobbidiBob
Known Participant
August 20, 2023
Answered

Frame Interpolation Bug?

  • August 20, 2023
  • 3 replies
  • 3265 views

I'm not sure if it is a bug or if I need to change some "hidden" settings.

Coincidentally today I noticed that a 25fps clip that I put into a 50fps timeline moved every frame. This should not happen as far as I know. So I checked if I had frame interpolation (Optical Flow or Frame Blending) turned on but the clips setting was on Frame Sampling... so there should be no frame interpolation going on and every 2nd frame should be identical to the one before, right?

Is there any global setting that I have to turn off?

I tried to interpret the footage to 25fps but it didn't change anything and I also tried to change the interpolation to something different (Optical Flow) and back to Frame Sampling.

The timeline is 50fps and progressive.

The only way I got the expected behaviour was by nesting the clip into a 25fps timeline.

 

So is this a bug or it there some setting I have to change?

 

    This topic has been closed for replies.
    Correct answer Ali Jaber

    I did some tests on my side and here is the conclusion: if the clip has fields (interlaced, not progressive), it will play every frame even if it's 25 fps playing in a 50 fps sequence, if it's progressive it will have the normal behavior that you expect.

    3 replies

    A
    Ali JaberCorrect answer
    Braniac
    August 21, 2023

    I did some tests on my side and here is the conclusion: if the clip has fields (interlaced, not progressive), it will play every frame even if it's 25 fps playing in a 50 fps sequence, if it's progressive it will have the normal behavior that you expect.

      Remote Index
      Remote Index
      Inspiring
      August 21, 2023

      Ali Jaber,

       

      It's not a matter of "playing every frame" or not - it's a matter of apparently playing frames that don't exist in the original media.

       

      That said - you raise an interesting possibility - BibbidiBobbidiBob, is your material interlaced? Are the timelines set to interlaced as well?

       

      R.

      A
      Ali Jaber
      Braniac
      August 21, 2023

      Because it's interlaced it will play half of the next frame, and it will look like 50 fps clip while it's 25 fps.

        Remote Index
        Remote Index
        Inspiring
        August 20, 2023

        Hello BibbidiBobbidiBob,

         

        Interesting problem.

         

        Can you give more information on the original clip ("get properties").

         

        Also ... have you checked supported formats for your material?

        https://helpx.adobe.com/ca/premiere-pro/using/supported-file-formats.html

         

        R.

          B
          BibbidiBobbidiBobAuthor
          Known Participant
          August 20, 2023

          Yes, the format is supported and nothing out of the ordinary.

          I had a closer look on this matter and tried different footage from different cameras/recorders (C300II, Ninja V, A7sIII, Panasonic AG-HPX371E). Sometimes the problem occurs, sometimes not. I will send you a list in a moment

           

          Ann Bens
          Ann Bens
          Braniac
          August 20, 2023

          Is the footage of variable framerate? What is the origin?

          B
          BibbidiBobbidiBobAuthor
          Known Participant
          August 20, 2023

          The footage is not variable. I don't remember when I had variable framerate footage the last time in a project but it made some problems (had to transcode it first externally).

          The origin is a C300II

           

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