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Paul_Gringo
Inspiring
July 18, 2025
Question

Strange mode - Optical Flow

  • July 18, 2025
  • 2 replies
  • 315 views

Slowed 7 minutes video in Optical Flow mode - video render for 5 hours. Why and who needs such a mode if no one will wait for so much time?  Yes, I have a powerful PC! I will not update bios)

2 replies

C
Community Expert
Carlos ZiadeCommunity Expert
Community Expert
July 19, 2025

if your footage is variable frame rate you will have to transofrm it to constant frame rate using Handbrake.

This is probably what causes prolonged delays when using Optical Flow... how long is your footage 

with Optical flow on?

 

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Paul_GringoAuthor
Inspiring
July 19, 2025

I have already deleted Optical Flow .. Apparently the problem is really in the frame rate. The first time I see this!

S
Community Manager
Sumeet_Kumar_ChoubeyCommunity Manager
Community Manager
July 22, 2025

Hi Paul, Variable frame rate can sometimes cause issues with frame interpolation. Could you please confirm if you were experiencing this issue with variable frame rate media? 

 

Thanks,

Sumeet

S
Community Manager
Sumeet_Kumar_ChoubeyCommunity Manager
Community Manager
July 18, 2025

Hi Paul,

 

Sorry to hear about this. Optical flow can be computationally intensive. Could you please share the media specs (format, frame rate & frame size), the percentage by which it is slowed down & the system specs (OS, CPU, GPU & RAM)? It will help us diagnose the issue properly.

 

Thanks,

Sumeet

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