Very slow export on clips with speedup

Hello,

I've been grading a timeline imported from FCP that has clips with changed speeds. All source footage is ProRes422HQ. Some of the clips are 4x the original speed, others have different speed settings.

The timeline plays back fine. When I render out though, the render slows down to a crawl (1 frame per minute) once it gets a couple of seconds into one of those clips with big speed changes.

I've tried to change the render speed to 5 and to use "cached" clips, but the render still slows down.

I'm on OSX with a GTX1060 3GB card. I've upgraded to the newest CUDA, and also tried to switch to OpenCL, but the problem persists.

I'm thankful for any tips.

thanks
yp

I've did some further research:

The problem seems to be the Quicktime Codec in the export - when I switch to TIF export the sequence renders out fine and very fast.

Has anybody experienced similar problems?

[Peter Chamberlain]

Tiff is not compressed so uses less cpu than and compressed format.

Hey guys facing a same issue here.
I need to get my project exported to FCPx, I select the option in deliver page.
Settings
Format =.mov
Codecs tried = DNXH 444, cineform

Davinci redolve just freezes, won't use any cpu or gpu..

But for the same project h.264 mp4 is rendering fine. Need help immediately as the delivery is in 2 days..!!

If it's for FCP, why not render to ProRes?
To be able to further help you:
– Which resolution are you rendering?
– Which GPU do you have?

If it's for FCP, why not render to ProRes?
To be able to further help you:
– Which resolution are you rendering?
1080p

– Which GPU do you have?

GTX 1060 6GB on my windows machine and Radeon Pro Vega 56 8GB on my office machine.

My office runs exclusively on FCP X and I'm on windows.