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Optical flow optimisation

New Here ,
Apr 24, 2024 Apr 24, 2024

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Hi everyone,

I was wondering if someone have any knowledge about improvements with optical flow in premiere pro, as I was thinking to buy topaz video AI to slow down my 25 fps footage, but of course I don't want to spend $299 to slow down a footage. My only other choice is optical flow in premier, but in the past I've been having weird issues with it.

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Community Expert ,
Apr 24, 2024 Apr 24, 2024

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25 fps is not ideal to slow down regardless of Optical flow.

Results also depend on the amount of movement in the shot.

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Community Expert ,
Apr 24, 2024 Apr 24, 2024

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Hello Francesco etc.,

 

I believe optical flow was introducted to Premiere Pro circa 2015. To my knowledge it has not been developed / improved since and given this history (10 years of stasis) I would not expect Adobe to develop it further.

 

The quality of the effect depends to a great extent on the source footage and a number of factors, but there will be artefacting regardless. There is this from the documentation:

"Optical Flow interpolation is ideal for modifying the speed of clips that contain objects with no motion blur, which are moving in front of a mostly static background that highly contrasts with the object in motion."

 

One thing you can try is doing your slowdown in stages (ie. from 100% to 80%, render and export, then again, repeat and so on). This may improve results, but again, depending on the original footage there will be artefacting in your results.

 

R.

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