Changing speed with Optical Flow - Kind of realtime...

Question

I use 1080p50 footage, XAVC HD, long-gop, from a Sony X70 camera. If i change the speed of a clip and change the Time Interpolation to Optical Flow i get a red render bar abowe the clip and the playback stutters unless i render the clip.

Yesterday i noticed that if i drop Lumetri Color to the clip the render bar changes from red to yellow and the clip plays back smooth as butter when the speed has been changed using Optical Flow.

The question i have is if there is another way to get clips with speed changes using Optical Flow play back in real time without having to add, for the moment, unnecessary Lumetri Color? It seems odd that in order to get realtime playback one are forced to drop Lumetri Color on it.

Computer:

HP Z440

Processor: Intel E5-1650v3

RAM: 64 GB

Graphic: Nvidia Titan X Pascal

HDD: PCIe SSD (Intel 750 series 1.2 TB)

Peru Bob · Accepted Answer

I would report that here:Feature Request/Bug Report Form

R Neil Haugen · Answer

I'm a bit flummergasted that applying an unused Lumetri effect to a clip causes long-GOP media to play back without stuttering. Let alone time-interpreted long-GOP. I've never seen anyone report that before!

Most of the colorists I know, with machines far above mine for power through the whole machine, transcode all long-GOP media before working it. While I can have some small simple things work without playback issues, I'm pretty quick to have PrPro make proxies for most of my long-GOP projects ... well, I throw a lot of Lumetri around, so ... needed.

So for most in your situation, they either render or have PrPro make the Cineform proxies from the supplied ingestion preset.

Neil

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