Optical Flow not working on 10.4.2 and High Sierra...

Hi there,

Since upgrading to 10.4 from 10.3.4, optical flow no longer works. I am working in Prores HD footage, on High Sierra.
I have a partition drive with optical flow running el captan and 10.3.4 and optical still works in that.

I've tried a couple of the solutions which are delete optical flow renders.

What I get when I change the setting from frame blend to optical flow is that in the render queue, it says its trying to render it but it's just stuck at the beginning of the render. Any thoughts? Help?

Rob

I'm not having any issues with OF in macOS 10.13 or FCPX 10.4. When you change your quality setting from Frame Blending to Optical Flow, and analysis takes place. The complexity of movement in that clip, and its duration determines how long the analysis will take. But, "rendering" doesn't automatically trigger when enabling OF. Again, on my home Macs and the Macs in our TV station, none have this issue. Are you talking about "renders" or "analysis" files you're deleting? How much are you slowing the clip down by?

thanks for your response but as was pretty obvious from my first message I’ve been using FCP X since that ghastly first 12 months that it came out.

I am well aware how long optical flow takes and given I’ve done it many times before on 10.3.4. There is some sort of conflict between high Sierra and the last major upgrade of the FCP X software...

All other heavy fx tenders work fine so the issue is something in the upgrade

Again, works fine on the dozen Macs I manage. Did you reset preferences? Did you delete all render files via file menu? Trying to figure out what's going on with your specific system, or what would cause such bug. Any 3rd party plugins used on the clip you're trying to so slow motion with?

Rob Moragas wrote: …
Since upgrading to 10.4 from 10.3.4, optical flow no longer works. … have a partition drive with optical flow running el captan and 10.3.4 and optical still works in that.
..

the 10.3>>10.4 update improved speed of OF renderings by utilizing Metal… I was told. And noticing on my cheap set-up.

So, speaking of in-compatibilties, first question is:
What is your hardware? Perhaps a Hacktintosh? …

Hi,

No its not a hackinTosh...Specs attached.

As I said worked fine in 10.3.4 and the upgrade to 10.4 has caused it to stop working.

I've done all the basics like trash preferences and also go into the renders folder and trash all renders. It still doesn't work.

Rob

Yes Yes,done all that. I wouldn't waste your time if I had not done that. I've also done in uninstall and reinstall of FCPX...still not working.

Rob

do you have the Perian add-on installed (listed in your System Prefs)?

Hi,

No I don't have pertain on my system

Rob

Hi Rob,

This is clearly an isolated problem.

I would like you to do a test in order to narrow down the possible causes. Create a new admin user. Log in with the new user, launch FCP X and try OF and exporting to PR4444 in FCP X. Does this solve the issue?

If this does not solve the issue: are you working with XDCAM media?

- Ronny

I'm having the same problem. Macbook Pro Retina 2013 with Nvidia. I noticed you have an NVIDIA card also. Did you ever solve your problem?

I just had this issue and fixed it, at least for me.

Turns out the clip I was trying to slow down with optical flow as 50p but was made from was seems to be 25p source material. When you set speed to automatic on a 25p timeline it plays at half speed (50%) but stuttery. Optical flow had no effect. In fact what happened was it would seem to analyse the clip, but then if you tried to render it was just stuck at 0%

But if I first exported the clip from the timeline effectively baking in the 25fps then brought it back into FCPX, set it to half speed and applied optical flow it worked as it is supposed to. Hope this helps someone.

Very interesting, Doug. Thanks for the feedback!

- Ronny