With ExtendScript, how to set the "Input File" or "Look" in Lumetri with a external blob?

[SultanDino]

I am able to set the Look by providing a index number which reprensents the menu option from the dropdown

app.project.activeSequence.videoTracks[0].clips[0].components[2].properties[32].setValue(5, true);

Is there a way to load a LUT as blob programatically and set it for the Look? Maybe somehow initiate the "Browse" option and programatically inject the the blob's path?

Checking this document about the Lumetri properties, on index 0 there is the Blob property, but I don't know what it is for? Reading the value from that property gives me some weird output like:

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I can't find any solution on the web and there is no much help in the documentation of the API.

[GoranLjubuncic]

@Bruce Bullis I would very much like to know as well if this is possible. Is there any way a "remote" LUT file can be applied programmatically in the Lumetri panel? I hope you don't mind me mentioning you, it's just that I was searching for something similar, couldn't find anything and saw that you helped others users with somewhat similar questions.

Thanks!

[Justin T - Hyper Brew]

In my testing, saving and setting LUT blob data is very complicated, and requires a fair amount of reverse engineering. There were 2 or 3 blob properties that need to be set, and each had it's own method of encryption. Even after seemingly setting these values correctly, I still couldn't get it to work, which leads me to believe that there are some other processes happening behind the scenes that the scripting API don't have access to.

However, I came across a much more simple way to get and apply LUTs with the path to a LUT file.

You can set the Input LUT by getting the Lumetri video component property, set the 4th prop to the path string, and the 6th prop to 1.

var pathToLut = 'path/to/lut.cube';
var lumetri = projectItem.videoComponents()[0];
var lutPath = lumetri.properties[4];
var input = lumetri.properties[6];
lutPath.setValue(pathToLut);
input.setValue(1);

[GoranLjubuncic]

Many thanks. Will test that out.

[SultanDino]

Thank you Justin for the help.

I get a null value for this:

var lumetri = app.project.rootItem.children[1].videoComponents()[0];

 Children[1] is the sequence. 

Is that the proper way of fetching videoComponents?

[Justin T - Hyper Brew]

children[1] is just an example, adjust to however you neeed to select your ProjectItem.

[GoranLjubuncic]

Hi @Justin T - Hyper Brew this works! Thanks a lot! 

[Justin T - Hyper Brew]

Awesome, sure thing!

[SultanDino]

hey @Justin T - Hyper Brew , I was able to get this working on the mac, but the problem is on Windows. When I set the path on Windows, the LUT gets not applied. First I thought that I provide the wrong path to the LUT file, but then I compared the path to the path it gives when selecting browse from the dropdown menu, and they are both the same. So path is not the issue. I also don't think it's a folder permission issue, cause before applying the LUT we write the LUT in the folder successfully. 

Have you been able to test this on windows?

[Justin T - Hyper Brew]

I got it to work on Windows and Mac with .cube LUT files. Can you post an example path? I believe I used paths with / posix (forward slashes).

[SultanDino]

The path is like:

C:/Users/<username>/Documents/PPRO/LUTs/78972/red.1653435528150.cube

<username> is my local username.

I even tried renaming the file to just red.cube.
I also tried insted of \, to use / and \\.
Maybe you have any suggestions?

[SultanDino]

Found the solution.

On windows, the path to the LUT should be:

C:/Users/<username>/Documents/PPRO/LUTs/78972/red.1653435528150.cube/

or

C:\Users\<username>\Documents\PPRO\LUTs\78972\red.1653435528150.cube\

A slash is added to the end of the path. We can use \ or / for path, both work.

[Justin T - Hyper Brew]

Strange, maybe the "." in the filename was throwing it off.

[SultanDino]

Even if the filename was red.cube, I had to place the / (or \) at the end.
But now, after two days, if I check the path again, it works without the ending \ or / on windows. 

I am testing on my mac on virtual machine (parallels) with Win10 and Win11.

We also tested on another machine virtually and LUT is applied fine.
But on one PC we have Win10 and the LUT is not applied with any of the paths above.
If you check the screenshot, you can see on the bottom left (circled in red), that the effect is applied and visible on the sequence thumbnail, but on the right in Lumetri effect preview (or in player) the effect is not visible.

This is the code where we set the path to the effect

for (var i = 0; i < effect.properties.numItems; i++) {
            if (effect.properties[i].displayName == "Look") {
                effect.properties[i].setValue(1, 1); // Look (33)
                effect.properties[i - 3].setValue(1, 1); // active (30)
                effect.properties[i - 2].setValue(LUTPath, 1); // Path (31)
            }
        }

No errors. I also am able to read the content of the LUT file from the provided path. 
@Justin T - Hyper Brew do you have any suggestion or idea what I could try else?

[SultanDino]

And to add to my last reply:
If I turn off the Lumetri effect, the effect on sequnce thumbnail on bottom left gets also updated. So the effect is applied, but it is not visible in main player for some reason...

[GoranLjubuncic]

@Bruce Bullis This is very interesting. Do you have any idea why a LUT wouldn't apply on Windows but it does on Mac? @Justin T - Hyper Brew For you the method which you detailed above works both on Mac and Windows in the latest version of PP?

[Bruce Bullis]

> Do you have any idea...

Not really. As previously mentioned, it's not recommended. Based on the discussion, I have to wonder whether escaping the backslash characters in the path might help: "C:\\some\\directory\\name"...

[SultanDino]

I think this was a anomally and that the Adobe software or Windows OS played games with us.

I was writing that I have added an ending \ at the end of the path and that it was working in VM on mac, but still not on real PC. Now I reverted that code to how it was in the beginning. And guess what - now it works on PC aswell. 

So no \ or / at the end of the path, and it just works...

I had few wtf programming moments in my career, and this is one of them now 🙂

[SultanDino]

Final conclusion:
On Windows PC, don't add \ to the end of the path
On mac running parallels for Windows virtual machine, you do need to add the \ to the end of path

[SultanDino]

Hi @Justin T - Hyper Brew can you help with this?

Seems like this code you wrote for applying a custom LUT stopped working in v23 of PPRO (testing with 23.6), but it works with v22 (22.5).

Any clues what might have changed in the API? From what I can see, they have added a new property on index 7 with displayName "Input LUT", which is the same on index 6. I tried playing with the properties, but had no luch getting it to work again.

Here is a screenshot of the effect.properties array:

Here is the sample code with which I apply the custom LUT:

for (var i = 0; i < effect.properties.numItems; i++) {
  if (effect.properties[i].displayName == "Basic Correction") {
      lookProperty = effect.properties[i]; // i = 2
      effect.properties[i + 1].setValue(1, true); // Enable effect, i = 3
      effect.properties[i + 2].setValue(LUTPath, true); // Set LUT Path, i = 4
      effect.properties[i + 4].setValue(1, true); // Update LUT selection dropdown, i = 6
  }
}

[SultanDino]

@Bruce Bullis do you have perhaps some direction?

[bbb_999]

I do not; Justin's guidance is the best available.

[GoranLjubuncic]

I'll hijack @SultanDino post once again but I'm having the same issue 🙂
@Justin T - Hyper Brew with the code you provided here what happens in the most recent versions of Premiere is that the LUT is fetched and stored locally on the drive, but is not applied to the clip. Under the drop down in the Creative tab it appears as if it's applied (it's listed there) but the effect doesn't show on the clip. If I click manually on the Browse button to browse for the LUT, I'm straight away in the correct folder where the LUT is stored locally and I can select it and then it's applied correctly but this is obvisouly just a workaround. Any clues?

Thanks!

[SultanDino]

Here is a overview of PPRO versions installed on latest MacOS version where the code above was working / does not work

22.5	Working
23.0	Working
23.1	Working
23.2	Working
23.3	Working
23.4	Not working
23.5	Not working
23.6	Not working
24.0	Not working

[SultanDino]

@bbb_999 so something changed in version 23.4 of PPRO which broke this functionality to programmatically apply a creative look / basic look. In the release notes for 23.4, I can't find anything that could give me any clues.

Next I will try to test the code on Windows.