novomesk/qt-jpegxl-image-plugin

[Request] Add guide/thoubleshoting

master-of-zen opened this issue · 8 comments

I figured out how to make it and install plugin.
JPEG XL thumbnails don't show up and image viewers don't recognize it, please help)

In order to activate thumbnails, it is necessary to update /usr/share/kservices5/imagethumbnail.desktop and the image/jxl mimetype (image-jxl.xml) should be installed.

In order to troubleshot I recommend to start gwenview from konsole to see various debug/error messages:
gwenview testimage.jxl

Jxl animations are known not to work now because of https://gitlab.com/wg1/jpeg-xl/-/issues/87

I also use the opt parameter to configure libjxl to see libjxl's internal error messages.
BUILD_DIR=/tmp/build ./ci.sh opt

Excuse me for newby mistakes)
This issue, not sure how to how to interpret it

Out of all steps only
image/jxl mimetype (image-jxl.xml) should be installed. is not done, don't know how to do that.
Added file association in settings manually
Console

> gwenview output.jxl 
Icon theme "gnome" not found.
org.kde.kdegraphics.gwenview.lib: Unresolved mime type  "image/x-mng"
org.kde.kdegraphics.gwenview.lib: Unresolved raw mime type  "image/x-nikon-nrw"
org.kde.kdegraphics.gwenview.lib: Unresolved raw mime type  "image/x-samsung-srw"

Gwenview gui show this error
2020_12_29_12_36_32

My imagethumbnail.desktop
thumbnails.zip

and here file itself
file.zip

Copy image-jxl.xml into the folder
/usr/share/mime/packages

I use slightly modified version ( https://gitlab.com/wg1/jpeg-xl/-/issues/81 ):

<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
  <mime-type type="image/jxl">
    <comment>JPEG XL image</comment>
    <comment xml:lang="fr">image JPEG XL</comment>
    <magic priority="50">
      <match type="string" offset="0" value="\xFF\x0A"/>
      <match type="string" offset="0" value="\0\0\0\x0CJXL \x0D\x0A\x87\x0A"/>
    </magic>
    <glob pattern="*.jxl"/>
  </mime-type>
</mime-info>

I think you made a mistake because you registered image/jpegxl and I believe it should be image/jxl

Run update-mime-database /usr/share/mime

and try again:
output

done:
Copy image-jxl.xml into the folder /usr/share/mime/packages
changed:
I think you made a mistake because you registered image/jpegxl and I believe it should be image/jxl
done:
Run update-mime-database /usr/share/mime

Still doesn't work.
same console errors
2020_12_29_13_23_51

I get same message when my plugin is missing or could not be loaded.
I have libqjpegxl.so in /usr/lib64/qt5/plugins/imageformats folder. On some systems it could be /usr/lib/qt/plugins/imageformats/ or /usr/lib/x86_64-linux-gnu/qt5/plugins/imageformats

If it is there, try to go to the folder and check ldd libqjpegxl.so if all required libraries are present.

libjxl.so.0 => not found libjxl_threads.so.0 => not found
for /usr/lib/qt/plugins/imageformats/libqjpegxl.so

libjpegxl installed

-- Up-to-date: /usr/local/lib/libjxl.a
-- Up-to-date: /usr/local/lib/libjxl.so.0.2.0
-- Up-to-date: /usr/local/lib/libjxl.so.0
-- Up-to-date: /usr/local/lib/libjxl.so
-- Up-to-date: /usr/local/lib/pkgconfig/libjxl.pc
-- Up-to-date: /usr/local/lib/libjxl_threads.a
-- Up-to-date: /usr/local/lib/libjxl_threads.so.0.2.0
-- Up-to-date: /usr/local/lib/libjxl_threads.so.0
-- Up-to-date: /usr/local/lib/libjxl_threads.so

OK, you found the problem!
I have them installed in /usr/lib64
Try to copy or symlink it there (or maybe /usr/lib on some systems) so the libjxl and libjxl_threads will be found easily.

Yep, it works now))