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BibbidiBobbidiBob
Known Participant
August 20, 2023
Answered

Frame Interpolation Bug?

  • August 20, 2023
  • 3 replies
  • 3324 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
    Community Expert
    Ali JaberCommunity ExpertCorrect answer
    Community Expert
    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
      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
      Community Expert
      Ali JaberCommunity Expert
      Community Expert
      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
        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

          I first thought it only happens on clips with MXF but as shown, I had the problem also with one of the Quicktime-Clips from the NinjaV

           

          Sorry, I only have it in German right now but the language of the data is somewhat universal I guess:

           

          PROBLEM DOES OCCOUR

           

          Typ: MXF
          Dateigröße: 2,25 GB
          Bildgröße: 1920 x 1080
          Framerate: 25,00
          Audioformat der Quelle: 48000 Hz - 24 Bit - 4 Kanäle
          Audioformat des Projekts: 48000 Hz - 32-Bit-Floating-Point - 4 Kanäle
          Gesamtdauer: 00:07:25:23
          Pixel-Seitenverhältnis: 1,0
          Alpha: Keine
          Farbraum: Rec. 709
          Farbraum überschreiben: Aus
          Eingabe-LUT: Keine

          MXF-Dateiinformationen:
          Wrapper-Typ: MXF OP1a (Typ: SingleItem SinglePackage MultiTrack Stream Internal)
          Datei erzeugt von: CANON, EOS C300 Mark II (1.00)
          AVC Long GOP High 4:2:2 Profile 10-bit Unconstrained Coding

          -----

          Typ: MXF
          Dateigröße: 164,28 MB
          Bildgröße: 1440 x 1080
          Framerate: 25,00
          Audioformat der Quelle: 48000 Hz - 16-Bit - 4 Kanäle
          Audioformat des Projekts: 48000 Hz - 32-Bit-Floating-Point - 4 Kanäle
          Gesamtdauer: 00:00:11:24
          Pixel-Seitenverhältnis: 1,3333
          Alpha: Keine

          MXF-Dateiinformationen:
          Wrapper-Typ: MXF-OP Atom (Typ: N Tracks, 1 Quellclip)
          Datei erzeugt von: Panasonic, P2 (2.0)
          DV 100

          P2-Metadaten-Details:
          UserClipName: STA_01_71
          DataSource: SHOOTING

          Access:
          Creator: TNN
          CreationDate: 2022-11-15T12:48:22-01:00
          LastUpdateDate: 2022-11-15T12:48:34-01:00

          Device:
          Manufacturer: Panasonic
          SerialNo.: K2TAA0019
          ModelName: AG-HPX371E

          -----

          (Ninja V)

          Typ: QuickTime-Film
          Dateigröße: 1,92 GB
          Bildgröße: 1920 x 1080
          Framerate: 25,00
          Audioformat der Quelle: 48000 Hz - 24 Bit - Mono
          Audioformat des Projekts: 48000 Hz - 32-Bit-Floating-Point - Mono
          Gesamtdauer: 00:02:29:06
          Pixel-Seitenverhältnis: 1,0
          Alpha: Keine
          Farbraum: Rec. 709
          Farbraum überschreiben: Aus
          Eingabe-LUT: Keine

          QuickTime-Details:
          Film enthält 1 Videospur(en), 1 Audiospur(en), 0 Untertitelspur(en) und 1 Timecode-Spur(en).

          Video:
          Es sind 3731 Frames mit einer Dauer von 1/25. vorhanden.

          Videospur 1:
          Dauer beträgt 0:02:29:06
          Durchschnittliche Framerate beträgt 25,00 fps

          Videospur 1 enthält 1 Typ(en) Videodaten:

          Videodatenblock Nr. 1:
          Framegröße = 1920 x 1080
          Kompressor = Apple ProRes 422
          Qualität = Höchste (5,00)

          ----------------------------------------------------------------

          PROBLEM DOES NOT OCCOUR

           

          (Ninja V)

          Typ: QuickTime-Film
          Dateigröße: 20,01 GB
          Bildgröße: 3840 x 2160
          Framerate: 25,00
          Audioformat der Quelle: 48000 Hz - 24 Bit - Stereo
          Audioformat des Projekts: 48000 Hz - 32-Bit-Floating-Point - Stereo
          Gesamtdauer: 00:03:57:23
          Pixel-Seitenverhältnis: 1,0
          Alpha: Keine
          Farbraum: Rec. 709
          Farbraum überschreiben: Aus
          Eingabe-LUT: Keine

          QuickTime-Details:
          Film enthält 1 Videospur(en), 1 Audiospur(en), 0 Untertitelspur(en) und 1 Timecode-Spur(en).

          Video:
          Es sind 5948 Frames mit einer Dauer von 1/25. vorhanden.

          Videospur 1:
          Dauer beträgt 0:03:57:22
          Durchschnittliche Framerate beträgt 25,01 fps

          Videospur 1 enthält 1 Typ(en) Videodaten:

          Videodatenblock Nr. 1:
          Framegröße = 3840 x 2160
          Kompressor = Apple ProRes 422 HQ
          Qualität = Höchste (5,00)

          -----

          (A7sIII)

          Typ: MPEG-Film
          Dateigröße: 800,14 MB
          Bildgröße: 1920 x 1080
          Framerate: 25,00
          Audioformat der Quelle: 48000 Hz - 16-Bit - Stereo
          Audioformat des Projekts: 48000 Hz - 32-Bit-Floating-Point - Stereo
          Gesamtdauer: 00:01:12:00
          Pixel-Seitenverhältnis: 1,0
          Alpha: Keine
          Farbraum: Rec. 709
          Farbraum überschreiben: Aus
          Eingabe-LUT: Keine
          Videocodec-Typ: MP4/MOV H.264 10 bit 4:2:2

          -----

          (A7sII)

          Typ: MPEG-Film
          Dateigröße: 355,19 MB
          Bildgröße: 3840 x 2160
          Framerate: 25,00
          Audioformat der Quelle: 48000 Hz - 16-Bit - Stereo
          Audioformat des Projekts: 48000 Hz - 32-Bit-Floating-Point - Stereo
          Gesamtdauer: 00:00:28:20
          Pixel-Seitenverhältnis: 1,0
          Alpha: Keine
          Farbraum: Rec. 709
          Farbraum überschreiben: Aus
          Eingabe-LUT: Keine
          Videocodec-Typ: MP4/MOV H.264 4:2:0

           

           

          Maybe you see a pattern, I did miss. Right now I'm pretty puzzled but almost convinced it has to be a bug (mainly because the behaviour is not consistent)

          What do you think? Should I start a bug report on this matter?

           

          Remote Index
          Remote Index
          August 20, 2023

          Yes - it's quite beyond me, I'd start a bug report with the above info.

           

          The last question - does it seem that you are seeing optical flow frames (ie. do any frames have tell-tale artefacts characteristic of optical flow) or frame blending (ie. do the frames appear to be dissolves of 2 frames)?

           

          R.

          Ann Bens
          Community Expert
          Ann BensCommunity Expert
          Community Expert
          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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