Skip to main content
B
boho
Participating Frequently
September 12, 2022
Answered

slow motion

  • September 12, 2022
  • 3 replies
  • 1601 views

Editing on a PP 22 

I've done a slow motion of a clip at speed 20% with time interpolation in Optical Flow mode.

I've seen and followed the very nice tutorial: 'How to create slow motion effect'. In spite of that my result is not acceptable. 'Outbursts'(?) occur in the edited slow motion version. 

Can anyone help with an explanation and / or a solution? I'm in a bit of a hurry 🙂

(The attached files are just samples from a longer sequence)

Bo

This topic has been closed for replies.
Correct answer Steve Griffiths

How about blurring the background after applying the optical flow to hide the worst of the optical flow artifacts? I just tried it with your 'slowed 20%' clip - applied a 'Directional Blur' effect and set it to 'Direction 90 degrees' and Blur Length to 126. The background looks different but this hides the artifacts fairly well.

3 replies

S
Steve Griffiths
Inspiring
September 13, 2022

As Mike has mentioned Optical Flow has a hard time with soft edges - particularly when multiple soft edges cross each other. It's great at smoothly track some stuff but in your case it's just not going to work. Even using Twixtor which is a plugin that you can buy and is more powerful than the built in optical flow in Premiere Pro probably would not do much better.

B
bohoAuthor
Participating Frequently
September 13, 2022

Hi Steve.
Thanks to you and Mike for your quick responses. I must admit that it is not possible to implement the slow motion effect in this way.
I have to go back to the basic footage and build the sequence in a different way.

Thanks for the help to both of you.

Bo

Ann Bens
Community Expert
Ann BensCommunity Expert
Community Expert
September 13, 2022

Try 25 percent.

B
bohoAuthor
Participating Frequently
September 12, 2022

Thanks for your reply Mike. I've already tried frame blending (see attached), but then an unfortunate stepwise movement occurs which I want to avoid. I want to keep the continuous fluid motion from the original recording.

bo

Mike Dziennik
Community Expert
Mike DziennikCommunity Expert
Community Expert
September 12, 2022

Try using Frame Blending, it might actually give you a better result on this clip.

Retiming clips to 20% is no small undertaking, optical flow tries to detect motion in the clip and generate the frames it thinks should be inbetween. It will struggle when you have these soft bands that are merging into each other...it doesn't know what to do. Some much of the success of these techniques depends on the clip your using.

 

B
bohoAuthor
Participating Frequently
September 12, 2022

You wrote: 'Retiming clips to 20% is no small undertaking' Do you think it would be better if I take the retimming in more smaller steps in stead of doing in one step? or will the problem for the software to mangae the soft bands be the same?  ,

Terms & ConditionsAccessibility statement
Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices