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Lightroom Desktop: Slideshow video exportation: does not take edits into account

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Engaged ,
Aug 06, 2019 Aug 06, 2019

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There is an issue (buck with the slideshow exportation:If you sync edits of a big amount of pictures, or read metadata from file, LR does generates a slideshow (video) WITHOUT taking the edits into account, UNLESS being charged before.By charged before, I mean being displayed and thus rendered, OR 1:1 preview generated.This is quite a big bug, imho.
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Adobe Employee ,
Aug 07, 2019 Aug 07, 2019

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How many images are we talking about here, Antoine?  I'd like to test your scenario but want to make sure I am in the ballpark. It would be helpful if you could spell out your process step-by-step so I can make sure my test is accurate. 
Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Engaged ,
Aug 07, 2019 Aug 07, 2019

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I'm talking about a lot of images, like for a time lapse with over 500+ images

Granted, with the 1080p 16:9 limitation, LR is maybe not suited for this kind of exportation, but it's nevertheless not the expected behavior for rendering a slideshow 😉

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Engaged ,
Aug 07, 2019 Aug 07, 2019

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A typical scenario:
Syncing all the images with the desired edits, wait until synced (of course) and then try to export through the Slideshow module.

A more advanced workflow involves "reading metadata from file" instead of syncing edits from one picture, but the end result is the same.

For what I understood, LR seems to render correctly only the images that have been rendered (not per se 1:1 previews) in the Library view. I mean, when you sync edits, and view an image, it takes some time (sometimes a fraction of second) to display the synced edits. If there are a lot of images, a lot of them are not displayed and thus not rendered.
Rendering the 1:1 preview is just a (long) workaround to force rendering. This is, however, overkill for the 1080p limit of LR.

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Adobe Employee ,
Aug 07, 2019 Aug 07, 2019

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This is the test I ran:

Create Collection of 485 Images all in color and synced
Convert all Images to Black and White
Allow edits to sync to cloud
Go to Slideshow and Export collection as video

Do I have that correct or did I miss something?
Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Engaged ,
Aug 07, 2019 Aug 07, 2019

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No, I'm talking about LR Classic only, so no cloud sync involved.
I'm talking about edit sync in the develop module:

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Adobe Employee ,
Aug 07, 2019 Aug 07, 2019

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Revision:

Create Collection of 485 Images all in color
Select one image
Convert to Black and White
Sync to other 484 images
Go to Slideshow and Export collection as video

Is that right?
Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Engaged ,
Aug 07, 2019 Aug 07, 2019

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Right 😉

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Adobe Employee ,
Aug 07, 2019 Aug 07, 2019

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Ok. I was able to reproduce with these steps. 

If I go to Grid before Slideshow and scroll through all the images until I see the visual update of the file, it appears to generate correctly. Does that match your experience?
Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Engaged ,
Aug 07, 2019 Aug 07, 2019

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Yes.

But if you DON’T scroll through the grid view and don’t update the previews and generate the video, LR uses the « previous » previews instead of the right ones.

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Adobe Employee ,
Aug 07, 2019 Aug 07, 2019

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Ok. I've duplicated what you are seeing and logged a bug. Thanks for the report and the instructions. 
Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Engaged ,
Aug 07, 2019 Aug 07, 2019

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Thanks Rikk!

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Adobe Employee ,
Jun 16, 2020 Jun 16, 2020

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LATEST
Version 9.3, an update to Lightroom Classic, went live on June 15, 2020 and contains a fix for this issue. Please install the update and respond back if it does not cure the issue for you. Thank you for your patience!
Rikk Flohr - Customer Advocacy: Adobe Photography Products

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