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EHill
EHill
Known Participant
March 18, 2025

Flattening Multicam clips changes all position keyframes to linear

  • March 18, 2025
  • 4 replies
  • 599 views

We've recently dicovered that flattening a multicam clip changes any easing/temporal interpolation on position keyframes to linear.

 

Here is a video of the behavior:

https://youtu.be/gDd1Ies18uc

 

This only seems to happen when both position AND scale keyframes are enabled. When only position is enabled the easing is carried through as expected to the flattened clip.

 

The media in our project is ProRes LT Quicktime files @ 1920x1080, 23.976fps. Sequence is 1920x1080, 23.976fps.

 

Premiere Pro v25.1.0 (Build 73)

macOS 14.7.2

Mac Studio 2023

Apple M2 Max

64GB RAM

    4 replies

    D
    Community Manager
    Dani_V.Community Manager
    Community Manager
    March 20, 2025

    Hi @EHill!

    Thank you for all the information provided, it's very helpful. The team is looking into this and we apologize for the inconvenience it's causing. Glad you found a workaround for the time being. Hope we'll have more information for you soon.

    Dani

      EHill
      EHillAuthor
      Known Participant
      March 20, 2025

      Hi @Rach McIntire,

       

      I made a new video more clearly outlining the expected behavior as well as the exact steps needed to reproduce the bug.

       

       

      Hopefully this makes it easier to understand. This problem has been plaguing our team for months. Repo's done in the edit aren't translating properly to online (who request XML's with multicam clips flattened). Now that we know the cause we're able to implement a workaround, but a proper fix for this would be a huge help for multicam workflows.

       

      Thank you!

      Eric

      EHill
      EHillAuthor
      Known Participant
      March 19, 2025

      Thanks for the quick reply @Rach McIntire !

       

      With only scale enabled, the temporal interpolation of scale keyframes do carry through to the flattened clip as expected. The bug seems to be specific to the interpolation of position keyframes and only happens when both position and scale keyframes are enabled.

       

      The YouTube video in my original post shows most of the steps needed to recreate the bug:

       

      -Apply both position and scale keyframes to a multicam clip.

      -Change the temporal interpolation of the position keyframes to bezier (or any option besides the default linear).

      -Flatten the multicam clip.

      -Temporal interpolation of the position keyframes is changed back to linear. Expected behavior is for the clip to maintain the bezier keyframes.

       

      Please let me know if you need any more info. Thank you!

        R
        Community Manager
        Rach McIntireCommunity Manager
        Community Manager
        March 19, 2025

        Hi @EHill,

        Thanks for submitting your bug report. Does it work if just scale is enabled?  Can you provide some steps to reproduce this issue?  We need a few more details to try to help with the issue. Please see: How do I write a bug report?  Sorry for the frustration and thanks for reaching out.

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