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reuko
Participating Frequently
March 11, 2024
Question

Optical Flow Ghosting Bug in PPro but not AE

  • March 11, 2024
  • 12 replies
  • 1107 views

I am working with some Mavic 3 drone shots and I need to slow down the footage, however when I use Optical Flow for the frame interpolation, I get a flickery - more like Frame Blending result in the preview window as well as the export. When I do the same speed reduction with the same Optical Flow interpolation in After Effects, it smoothes wonderfully and as expected.

This was tested on both a Windows 11 PC and an M2 Max Macbook Pro, the preview and export results are the same on both machines. I have created sequences/comps directly from the clips themselves, and I double checked the export settings to be sure Optical Flow was selected as the frame interpolation option.

I am currently using Premiere Pro 23.5.0, and I have seen this same bug/ weird result in earlier versions of Premiere Pro as well. I am using After Effects 23.6.2 and all the Pixel Motion/Optical Flow slow motion renders out correctly.

I would prefer to not transcode footage between After Effects and Premiere Pro just because the Optical Flow in PPro isn't behaving. I have attached a comparison showing the buggy Premiere Pro Optical Flow interpolation vs the After Effects correct Optical Flow interpolation.

Has anyone else seen this? Would appreciate any pointers if there is a setting to fix it! Otherwise I'm happy to help clarify anything if this is a proper bug.

Thanks for your time! 

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    reukoAuthor
    Participating Frequently
    March 11, 2024

    Hello thanks for writing back so quickly!

    I have just tested this on the latest Premiere Pro 2024.2.1 and the same Optical Flow issue is present.

    I also tested this on the latest Premiere Pro Beta 2024.4 with the same buggy result.

    Here's the data for the video I'm testing with, and I see the same result with any footage or video file, including 30fps and 60fps ProRes media. I only work with constant frame rate media, so this isn't an issue with variable framerate. I'll repeat that I do not see this result in After Effects, the result there is working nice and smooth.

    DJI_0448
    3840 x 2160
    00;06;12;16, 59,94 fps
    48000 Hz - Stereo
    Color Space: Rec. 709

      Kevin J. Monahan Jr.
      Community Manager
      Kevin J. Monahan Jr.Community Manager
      Community Manager
      March 11, 2024

      Hi @reuko,

      Thanks for writing in. I'm not aware of this bug. Sorry about that.

       

      Can you please try the current version of the applications to see if the issue has been fixed? You can also check the beta to see if your problem has been addressed. If it has not been fixed, please provide more info in the following format as a reply: How do I write a bug report? That would be super helpful.

       

      I hope we can figure out what's going on here. I apologize for the frustration.

       

      Thank You,

      Kevin

      Kevin Monahan - Sr. Community and Engagement Strategist – Adobe Pro Video and Audio
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