Lightroom Classic: Auto Stack not working correctly

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  • Updated 2 months ago
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I'm seeing some weirdness with Autostacking by time in Lightroom Classic. The screenshots below should illustrate the problem. Current versions of everything. Yes, the images are dups of each other -- thanks mostly to importing into Lightroom Mobile while syncing between multiple devices which also have iCloud photo sync enabled. Silly me for thinking "it would just work." 













I should have 3 stacks, first one should have six images (7:54:44pm) , second two should each have two images (7:54:45 and 7:54:56)  Light room wants to have 2 stacks and 3 individual photos. Also note - the stacks are jumbled with respect to times. I'd be happy to share the images with Adobe engineers, if it would be useful to resolve this. 

I've noted this behavior on multiple different directories. If I adjust the slider for longer time periods, the stacking gets worse. 
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daniel.h.brown

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Posted 2 months ago

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John R. Ellis, Champion

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I'm wondering if this is caused by bugs with syncing capture time. (LR has long had bugs, many fixed, with how it represents capture time, some caused by syncing and some caused by photos missing capture times.)

Try this simple experiment: Select all those photos, do the menu command Metadata > Edit Capture Time, then click Change All.  This won't change any photo's capture time as displayed, but it (usually) makes the multiple copies of capture time stored per photo in the catalog all consistent.  Then do Auto Stack again -- does it work better?
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daniel.h.brown

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This does seem to have adjusted things. I selected each set specifically (6, 2, 2) and now it does auto-stacking as I'd expect. Will have to try on a different directory to see if doing a simple "select all" and then the edit/change-all will do the right thing. Am I correct in reading what you're saying that the LR catalog and the actual EXIF data is just somehow out of sync, and that Auto Stack is going by the catalog data, not reading the actual files? 
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daniel.h.brown

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I've tried this a few times -- if I use "Metadata-> Revert Capture time to Original" and then "Photo->Stacking->Auto Stack by Capture Time" it seems to work as I'd expect. Will need to experiment more. Still seems like a "hidden feature" that needs to be... "adjusted" in the Lightroom interface. 
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Yves Crausaz

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Bonjour, un des souscis avec toutes les fonctions de LR se basant sur les heures, c'est que les champs n'enregistre pas le 1/100 de seconde et aujourd'hui, les derniers apn ont des rafales de prises de vue très rapide et que ces valeurs sont arrondies à la seconde !
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daniel.h.brown

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The files I'm showing above are actually not bursts, but rather are the same files which have been duplicated by trying to sync through (arguably too many) different methods. They're copies of one another, but somehow are confusing auto-stacking. Based on the thread above, I'm starting to think that the meta-data "capture time" is somehow different between what is in the file and the Lightroom catalog. Would seem like that should be able to be made visible somehow.