How can I fix optical flow export issues in my edits?

Hello everyone !

I still have this problem since optical flow exist I think : every time I use it and make some editing and change when I export my film, I have a message saying some rendering are not finished. I did put the cash outside the library, did trash the preferences, trash the cash, restart etc. I have this issue for many years and I am desperate to see that today it is still the same problem (I have a M2 pro up to date), the only way is to not use optical flow or to switch to regular slow motion and switch back to optical flow. Sometimes it works, sometimes not. When you have hundreds of clips, you really lose hours for this. Is there really no solution today ?

thanks for reading this,

all the best to you and have a great creative day !


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MacBook Pro 16″, macOS 15.4

Posted on May 11, 2025 10:29 AM

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4 replies

May 11, 2025 11:22 PM in response to Michel Boissonneault

Bonjour Michel,

thanks for your reply but unfortunately I'm aware of that already, it's been years now that I have this issue from time to time, specially when I have tons of slow motion ☹️… I trash the cache, re-render and there is always somewhere, some transcoding of optical flow that is not done or prpblematic and impossible to find where (for this project I have 16 layers of compound clips). In this case, after many attempts, when I finally can export, images are missing at random places in the timeline. And I don't know if there is a way to change all slow motion settings at once (and forget about optical flow).

May 13, 2025 8:09 AM in response to BenB

Thanks for your comment Ben,

I'm as surprise as you that this is still not fixed after all the big upgrades since invention of optical flow. I do trash and relaunch and never used the background rendering either but it's really annoying since I see sometimes that the slow motion is not good. I'll be happy to hear that there's a solution so we could focus on something else.

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How can I fix optical flow export issues in my edits?

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