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Nemo breaks thumbnails for Jpeg XL files #3562

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Nemo breaks thumbnails for Jpeg XL files#3562

Description

@mruncreative
mruncreative
opened on May 24, 2025

Distribution

Mint 22.1

Package version

nemo 6.4.5

Frequency

Always

Bug description

Nemo not only fails to generate files for .jxl but actively breaks them in a way Pix will be unable to create or display thumbnails for them.
If first viewed with Pix the thumbnails generate fine inside of Pix and display correctly in Nemo afterwards too but if you refresh a couple times with F5 Nemo will attempt to update the thumbnails and the same situation will occur.

Steps to reproduce

See description

Expected behavior

Succeed at generating thumbnails for jxl files

Additional information

No response

Activity

  1. mruncreative commented on May 24, 2025

    @mruncreative
    mruncreative
    on May 24, 2025
    Author

    I already mentioned it here: linuxmint/xviewer#162
    but it's not really related to xviewer at all.

  2. leigh123linux commented on May 24, 2025

    @leigh123linux
    leigh123linux
    on May 24, 2025
    Member

    Nemo uses gdk-pixbuf to process jxl images.
    jxl support is provided by the jxl-pixbuf-loader package, linuxmints base might be too old to include it.

    Image

  3. leigh123linux
    closed this as completedon May 24, 2025

  4. mruncreative commented on May 24, 2025

    @mruncreative
    mruncreative
    on May 24, 2025
    Author

    Why does it work for you? Developer build? Other OS?
    Are you saying it will fix itself with the next full release?

  5. leigh123linux commented on May 24, 2025

    @leigh123linux
    leigh123linux
    on May 24, 2025
    Member

    It works for me because I have jxl pixbuf loader installed.

    $ rpm -qa jxl-pixbuf-loader nemo
jxl-pixbuf-loader-0.11.1-2.fc42.x86_64
nemo-6.4.5-1.fc42.x86_64

    https://packages.ubuntu.com/oracular/libjxl-gdk-pixbuf

  6. mruncreative commented on May 24, 2025

    @mruncreative
    mruncreative
    on May 24, 2025
    Author

    Can I even install that on Mint? Don't know how to with apt. I only have xapp-jxl-thumbnailer here.

  7. mruncreative commented on May 25, 2025

    @mruncreative
    mruncreative
    on May 25, 2025
    Author

    I discovered that certain Jxl files DO thumbnail SOMETIMES (particularly those generated by gimp 2.10 as opposed to gimp 3).
    If you export an 8 bit image with GIMP 2 it will import as 8 bit and if exported with GIMP 3 it will import as 32-bit floating point. Maybe that has something to do with it.
    But maybe GIMP was generating the thumbnails. Anyway here's what Nemo puts out when trying to thumbnail jxl files:

    ./lib/extras/enc/encode.cc:62: JXL_FAILURE: Bit depth does not fit pixel data type
./lib/extras/enc/apng.cc:201: JXL_RETURN_IF_ERROR code=1: VerifyPackedImage(frame.color, ppf.info)
Encode failed
Could not generate thumbnail for '/home/a.jxl': Command '['djxl', '--bits_per_sample', '16', '--num_threads', '1', '--quiet', '/home/a.jxl', '/dev/shm/tmpmz4dbg1g.png']' returned non-zero exit status 1.

  8. leigh123linux commented on May 25, 2025

    @leigh123linux
    leigh123linux
    on May 25, 2025
    Member

    File the issue against the jxl package or their github, it's their issue.

  9. iateyourgranny commented on Oct 15, 2026

    @iateyourgranny
    iateyourgranny
    on Oct 15, 2026

    I found a fix by changing 16 bits per sample to 8 in /usr/bin/xapp-jxl-thumbnailer
    "djxl", "--bits_per_sample", "8", "--num_threads", "1", "--quiet", t.args.input, tempf.name

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