Proxies scrubbing and playing back choppy

Question

So the situation is:

I have R3D media in a variety of sizes, from 4K all the way to 8K. I've created 1080p Pro Res Proxies from all of it, with the largest being 2048x1080.

In Premiere, even with proxies enabled, when I open the clip and try to scrub through it or playback, it's very choppy and laggy. However, if I change the playback resolution from Full to 1/4, the playback and scrubbing is smooth. This makes me think that perhaps the 1080p proxies are being up-res'ed to 8K because of the resolution of the original media?

Even stranger, when I offline the original media, the issue still persists.

Note that I have a LUT on the proxies in a Lumetri Color effect. When I turn the effect off, the proxies play back and scrub perfectly fine.

Even weirder - if I import the proxies on their own, completely separate from the original media, and I have the LUT, they play back and scrub perfectly.

Finally, one thing I've done is Reconnect Full Resolution Media directly to the proxies. Then I attach the proxies. Then I offline the original media (which is now the proxies in this scenario) and it works.

I'm stumped. Anyone experience this before?

Thanks!

John V Knowles · Answer

I'm not 100% convinced you have a good workflow going here. The whole idea behind proxies is to make really low res, lightweight files to edit with, not make 2K versions of large material. You also didn't list your system specs but it sounds like it's struggling with things like the Lumetri LUT; I think you're overloading the system.

If it were me I would make proxies using the basic ProRes proxy preset from inside Premiere, which are very small and non-HD. Premiere will scale them and apply anamorphic squeeze as necessary to match your original footage. You can also modify your own preset so that it adds the LUT during the transcode, so that's one less effect you need to turn on while working. Finally, there;s no shame in lowering the playback resolution if it helps you get the job done; i often work at 1/2 and I barely notice the lesser quality.

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