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JonathonDean
Participant
August 3, 2017
Question

Time remapping, ramping causing choppy video

  • August 3, 2017
  • 3 replies
  • 12630 views

I've been shooting real estate with my drone and a lot of the footage needs to be sped up, slowed down, or ramped up or down.  When I do this and export the video, the final product seems to be skipping frames ever so often on any clips which the speed is altered.  My most recent issue was shot at 1080 30fps h.264.  The opening clip I'm approaching a property at 200% speed and as I get closer, I ramp back down to 100%.  Those first 10 seconds are really hard on my eyes.  Any ideas what may be causing this?  Is there anything I can do to smooth this out? 

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    3 replies

    G
    gabriel1992
    Participant
    July 3, 2018

    Try using ''Optical Flow'' before rendering

    It may help

    Gab Larkin

      Kevin-Monahan
      Community Manager
      Kevin-MonahanCommunity Manager
      Community Manager
      August 18, 2017

      Hi JonathonDean,

      Sorry for this issue. Did you ever find a solution? Please let us know if you have or if you still need help.

      Thanks,

      Kevin

      Kevin Monahan - Sr. Community & Engagement Strategist – Pro Video and Audio
      R Neil Haugen
      R Neil Haugen
      Legend
      August 3, 2017

      Think of what's going on here ... you're getting closer to the center items of the video. So ... things are getting bigger. Then you double the speed of approach, so things are changing size twice as fast. But you're still only able to end up with 30 frames per second.

      Each frame, at the base motion of the drone plus 200%, is a lot closer than the preceeding frame.

      What is most notable is the "sharpness" of the jumps. One of the factors of being "cinematic" is the amount of natural blurring during panning and motion, that at times saves our eyes & brains from having to process too much data too fast. Perhaps you need to apply some frame-blending, or optical flow, which might smooth things ... or add a small amount of perhaps Motion Blur effect to the speed-ramped sections.

      Neil

      Everyone's mileage always varies ...
        J
        JonathonDeanAuthor
        Participant
        August 3, 2017

        That makes sense.  I tried applying optical flow to that clip and it destroyed the line detail in the roof.  I'll try some different settings with the remapping and see if it cleans up at all.  I didn't consider the motion blur, I'll give that a shot as well. 

        Is there anything I can do on the camera side to allow for easier time remapping in post? 

        Thank you very much for the reply, this has been bugging me for a while.

        R Neil Haugen
        R Neil Haugen
        Legend
        August 3, 2017

        Getting a "proper" feeling of motion without either too much "jumpiness" from too-sharp images or too much blur is part of learning the craft. Including things like not zooming past something too close as that exacerbates the problem. So ... a bit more altitude over that initial pass would have resulted in less jarring motion visually ... but with a smaller image of the buildings.

        Being able to have that much high-frequency detail go by that fast ... without someone wanting to lose their lunch ... ain't easy. You'll maybe find that you need to both adjust what you do in filming, and how you treat the media in post. Try the different frame blending options, try Motion Blur (which I know is used by some drone folks), and try the various settings. I'd also check what the folks on some of the drone forums say to do with this sort of issue.

        Neil

        Everyone's mileage always varies ...
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