Batch conversion not writing meta above certain threshold

Troubleshooting and Bugs
1

NLP 3.1.1
Lightroom Classic 15.2.1
macOS Apple Silicon
VueScan RAW DNG workflow

Issue:

NLP metadata writing fails above a certain batch size.

Results:

  • 1 image: works

  • 5 images: works

  • 10 images: works

  • 20 images: works

  • 30 images: works

  • 34 images: works

  • 36 images: fails

  • 38 images: fails

Observed behavior:

  • Images are visually converted correctly.

  • Lightroom History contains the NLP conversion step.

  • Develop settings survive and can be restored via “Read Metadata From File”.

  • NLP metadata required to reopen/edit the conversion is not written.

  • NLP later treats the images as unconverted.

  • Lightroom displays metadata write errors.

Additional notes:

  • Reproduced in a brand-new Lightroom catalog.

  • Reproduced with Roll Analysis enabled and disabled.

  • Same VueScan DNGs work correctly in smaller batches.

  • File permissions and ACLs appear normal.

  • Dropbox was ruled out by moving files locally and reproducing the issue.

2

Are you 1000% sure that you are on NLP v3.1.1?

I was just supporting someone else with the same issue, and it turned out they were on an earlier version of NLP…

3

I got a similar “issue” with metadata not being written, but it always looked like coincidence rather than a rule. sometimes, md would be written, sometimes not, and the files with the signaling tags were here and there, even when all images were in the same folder.

Timing might be a cause for this erratic pattern and maybe the solution is to simply write md again, as I do manually. NLP can possibly do the same, e.g. trigger a rewrite when closing.

4

100% certain - i downloaded the plugin a couple of weeks ago

1 Like
5

Ok, thanks for double checking this and all for all the details you provided earlier.

I’m not able to replicate this on my Apple Silicon MacBook, so it might be something particular to your setup.

A few other things to try:

  • Update Lightroom Classic to the latest version
  • Try resetting Lightroom Preferences (which will require reinstalling NLP). This can sometimes clear out issues.
  • If you have any raw files that are not through Vuescan, see if you encounter the same issue with those (it could be something particular to the metadata there).

I hope that helps!

-Nate