Slowdown using LUTs - questions, analysis and workarounds

Read a few complaints about LUTs in Speedgrade on various forums and just thought I'd share my experiences:

Basically, it comes to Speedgrade slowing to the point of use, when you use certain (especially third party) LUTs. Specifically, Speedgrade seems choke before performing a primary setting or on top of large LUTs secondary (i.e. 3D LUTs based on a large number of samples). Note that reading after application of LUTs, no matter the size, is never a problem for me, it's just the initial calculation that requires a lot of - single thread - CPU time adjustments. I guess, whenever a setting is changed, Speedgrade calculates a rank of "total sum" he can then use for accelerated reading material.

Some figures: in my case, everything will happen to 16 samples - corresponding to .cube files less than 100 KB - and has already become extremely lag by 32 or .cube files about 750 KB. Considering that many commercially available lut is based around 64 samples, with 5 MB. .cube files, it is not surprising that people's experiences have been bad enough...

In this spirit, an obviously imperfect solution is to downsample read using a commercial program (or maybe someone has a suggestion for freeware?) as LUTBuddy from red giant, returning to the original version for a final check. I am not really satisfied with this, and in many cases, a 8-sample LUT will leave a sample of 32 may defeat the purpose of using a LUT in the first place.

Here's where things get interesting: the effect is more severe with my CP200 rudders, which are based on ethernet, that when you use the mouse to drag the color wheels (what is torture). But this relative difference disappears when applying the LUT to a main item and then make adjustments in the individual home itself OR when you apply the LUT in first. Of workaround seems to work too long the effect READ and the primary setting are not directly stacked. (Now, if only Speedgrade would allow us to apply effects of main element in merged clips...) If I had to guess, there is a "gap" between the calculation of the main element and the calculation for the individual clip, allowing Speedgrade query the control surface more frequently.

Finally, strange and wonderful things can happen with very variable results when adding LUTs in first into the mix. I do not recommend this.

So, in summary:

1. large LUTs can must be sous-échantillonnées can be used in conjunction with additional adjustment. It is more a problem for the patches and technical LUTs is for creative looks.

2. when Speedgrade starts to choke on a LUT, the responsiveness of the control surfaces (or maybe just the CP200) when making any other adjustments decrease point of inactivity...

3.. .but only if the LUT effect and other adjustments as you try to make are directly stacked.

Comments, ideas...?

Hi Seneca_lives,

Thank you for this bug filing. We have identified this problem and are working on a fix in the next version. Sorry for this frustrating problem.

Thank you
Kevin

Tags: SpeedGrade

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