Missing EXIF data in some JPEG images

[jlvdb]

Describe the bug

On a small fraction of JPEG images, Darktable shows no EXIF data (camera, lens orientation, etc.). EXIF data looks correct when viewed in external viewer. I am shooting RAW+JPEG and the RAW file has been handled correctly by darktable (shot with Sony a6000). The image was imported through DT's copy&import function and the file was named correctly based on it's EXIF timestamp.

Steps to reproduce

Unfortunately I do not have the original image anymore, so cannot reproduce the issue, but I included the image below. As said above, this images has already been imported and copied by DT.

Expected behavior

No response

Logfile | Screenshot | Screencast

Commit

No response

Where did you obtain darktable from?

distro packaging

darktable version

4.6.1-1.1+74.1

What OS are you using?

Linux

What is the version of your OS?

Linux Mint 21.2 Cinnamon

Describe your system?

No response

Are you using OpenCL GPU in darktable?

No

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

[victoryforce]

but I included the image below

I don't quite understand from your text, is this image the one for which darktable doesn't show the EXIF data?

[jlvdb]

Yes, if I download the image and import it to a new filmroll, this is the image information that DT shows (none)

This is what it should show instead (from mint's Xviewer)

[victoryforce]

Can't reproduce:

 
The exiv2 command line utility doesn't show data either?

[jlvdb]

It seems that the file is fine for exiftool, but exiv2 says corrupted image metadata.
This issues seems to be an issue not with just one photo, but with about 70 out of a 3000 that I have tried to load into DT so far. Although I haven not confirmed with exiv2 yet.

[jlvdb]

This would indicate to me that it is either an issue with the camera or exiv2. Just wondering how you get a correct reading of the EXIF data and I don't. Maybe a different exiv2 oder DT version?
My system is using libexiv2-27:amd64 / 0.27.5-3ubuntu1 I think.

Either way, I fixed the files in question by rewriting them with exiftool. After refreshing the EXIF in DT, the images were read correctly.

[victoryforce]

This would indicate to me that it is either an issue with the camera or exiv2.

exiv2, most likely

Just wondering how you get a correct reading of the EXIF data and I don't. Maybe a different exiv2 oder DT version?

darktable is the same (4.6.1) but built with exiv2 0.27.7

My system is using libexiv2-27:amd64 / 0.27.5-3ubuntu1 I think.

@kmilos Is this smells familiar to you? Is this the same bug you fixed in exiv2 0.27.7 and 0.28.1?

[kmilos]

I wish my brain could remember all the bugs! Will need to build 0.27.5 and 0.27.7 in debug at some point and check what's going on...

[kmilos]

Yep, after a brief search, this seems to be Exiv2/exiv2#1881 (comment) that was fixed in exiv2 0.27.6

[victoryforce]

@jlvdb You need a newer libexiv2 on your system, so I'm closing the issue since it's not a darktable bug.

[jlvdb]

Thanks for helping me sort this out!