How do I stop this stutter on a sped-up pan shot?

[unknownsailor]

I took a slow 180 degree pan from a drone and sped it up but the result is that it looks stuttered. Take a look here:

949 days on an desert island - ep142 - YouTube

The shot was taken in 4k at 30fps and placed in a 1080 29.97 drop-frame time-line. I applied optical flow to the original footage which was sped up by 230.1% (because that's what fits the break in the music) and then nested it to apply warp stabiliser. I then applied optical flow to that. I have tried various different variations on those settings, from only applying optical flow to one or none of the clips (nested and original) and changing the % of warp stabiliser.

I understand that if I apply a 24p clip to a 30p timeline I get missing frames, or if I slow a clip down lower than the timeline frame rate, but I don't normally have a problem with sped-up footage, especially if I apply warp stabiliser. You can see a slow fly-in sped up here 949 days on an desert island - ep142 - YouTube without issue so this has to do with the panning.

Doesn't the sped up footage have enough frames to create a smooth motion, or does a sped up piece of footage also have to be divisible by the frame rate in the same way 60p can be halved by 50% on a 30p timeline? I've sped up panning shots previously and I've not seen this so pronounced.

Any tips or any plug-ins that remove this problem?

Thanks in advance.

[Carlos Ziade]

You can refer to the full Adobe Help here: Change Clip Speed and Duration in Adobe Premiere Pro CC

Exporting time interpolated media

The Time Interpolation setting in the Export Settings dialog box (File > Export > Media) allows you to change the frame rate of the exported file by using Optical Flow to interpolate the missing frames. For example, if you have a 30-fps footage that you want to export at 60 fps without repeating every frame, you can export the media with the Optical Flow option in the Time Interpolation drop-down box selected.

Export time interpolated media

Frame Blending

In some footage, using Optical Flow for creating smoother motion does not produce the desired results. In such scenarios, you can use one of the other time interpolation options--Frame Sampling or Frame Blending. Frame Sampling repeats or removes frames as required, to reach the desired speed. Frame Blending repeats frames, and it also blends between them as required, to help smooth out the motion.

You can access all the time interpolation methods from within Premiere Pro using one of the following options:

• Choose Clip > Video Options > Time Interpolation > Frame Blending | Frame Sampling.
• Right-click on the clip in a sequence and choose Time Interpolation > Frame Blending | Frame Sampling.
• Open the Speed/Duration dialog box and use the Time Interpolation drop-down.
• Open the Export Settings dialog and use the Time Interpolation drop-down (this method only applies to exported media).

[unknownsailor]

Thanks for that but it doesn't really answer my question. This is 30p footage on a 30p timeline. The only difference is the footage is sped up and I'm not sure any of the time interpolation options will fix the problem.

[Ann Bens]

If you are shooting panning footage with the intentions of speeding it up you should set the camera to 60p.

As of now I dont think you will get this fix within Premiere especially with the footage sped up 230%. (Might want to try even numbers: 60x, 120x, 240x etc.)

If you want to get this right might want to have a look at : Twixtor.

https://revisionfx.com/products/twixtor/

[Carlos Ziade]

Hi Ann, I've tried Twixtor before but it doesn't always work perfectly especially with nested sequences and other effects applied,

although it really does a great job when it works perfectly. I think it depends on the footage quality and lighting, it really needs enough data to process with ...

[Ann Bens]

I dont nest but use an intermediate file.

[Carlos Ziade]

yeah its not required to go for nesting but the user here is nesting because he is applying other effects like warp stabilizer

[Ann Bens]

I hardly ever nest if it gets to complicated, regardless of warp being used.

[Carlos Ziade]

You mentioned that you've sped up footage with panning before without any issues,

what was the frame rate of those footage? What was their format?

[Carlos Ziade]

I'm not really sure if this will fix the little jarring, but try Time Remapping instead:

https://blog.pond5.com/15919-time-remapping-premiere-pro/