Render Optical Flow

[Noah Kadner]

Anything’s possible with the right combination of source media and system specs but as a general workflow- working fine here.

Noah

FCPWORKS – FCPX Workflow
FCP Exchange – FCPX Workshops
XinTwo – FCPX Training

[Jeff Kirkland]

It’s just you. Optical flow is working as expected on the three macs in my office.

—-
Jeff Kirkland | Video Producer & Cinematographer
Hobart, Tasmania | Twitter: @jeffkirkland

[Thanos Papadopoulos]

Optical flow with 2 or 3 speed segments renders normally?

Fix it in Pre.

[Noah Kadner]

No issues here. However if you can make it happen consistently-

https://www.fcpworks.com/submitting-better-fcpx-feedback-to-apple/

Noah

FCPWORKS – FCPX Workflow
FCP Exchange – FCPX Workshops
XinTwo – FCPX Training

[Joe Marler]

[Thanos Papadopoulos] “This thing happens often with different clips and on different macs. These clips cannot be rendered! I have to export it and reimport it to see these clips”

I have seen this behavior periodically, and I’ve seen others report it. I think it’s a bug. However you don’t need to export and re-import it. The optical flow is usually being calculated correctly upon export, but it doesn’t always render visually properly in the timeline.

I’ve seen reports that deleting generated library files might make the problem temporarily go away. Also if you are using optical flow on a speed ramped clip that can cause it. In that case try blading the clip and only apply optical flow on the bladed section.

[Thanos Papadopoulos]

Thanks Joe.

Fix it in Pre.

[Jeremy Garchow]

I also think Optical flow cause weirdness if the clip and timelknenframe rate mismatch (30p clip in 24p timeline, or similar).

Not sure if it applies to you, but other than that, I find optical flow to work really well most of the time, depending on what I’m trying to slow down.

[Thanos Papadopoulos]

I use optical flow really often and helps me a lot too. I don’t think that is a frame rate issue but I’ll check this out next time and I’ll update this thread.
I am a freelancer editor so I use different editing suits and I’ll confirm if it’s a hardware or software problem.

Fix it in Pre.

[Doug Metz]

I also use it regularly, and can corroborate Joe’s findings. Had this problem last week on a 30p animation (matching timeline frame rate). Timeline showed unrendered optical flow sections but was able to output successfully.

Doug Metz

Anode

[Nikos Papadopoulos]

Usually this happens if the system has NVIDIA instead of AMD. If you’re on a Mac Pro (pre 2013) and have installed a custom NVIDIA card, know that this is usually the cause. If you’re on a laptop with NVIDIA, again its a bug. After working on the latest MBPro 2017, all these issues disappeared for me.

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