[digikam] [Bug 498650] New: avif file fails to load, but loads after renaming the same file to `.heif`

[Yuxuan Shui]

https://bugs.kde.org/show_bug.cgi?id=498650

            Bug ID: 498650
           Summary: avif file fails to load, but loads after renaming the
                    same file to `.heif`
    Classification: Applications
           Product: digikam
           Version: 8.5.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: DImg-Core
          Assignee: digikam-bugs-n...@kde.org
          Reporter: yshu...@gmail.com
  Target Milestone: ---

STEPS TO REPRODUCE
1. Try to load an `.avif` file

OBSERVED RESULT
digikam show no thumbnail, when trying to open the image, it says "failed to
load image".

in the logs

```
digikam.general: Trying to get thumbnail with DImg preview for "a.avif"
digikam.dimg: "a.avif" : Unknown image format !!!
digikam.general: mimetype =  ""  ext =  "AVIF"
digikam.general: Cannot create thumbnail for "a.avif"
digikam.general: Thumbnail is null for  "a.avif"
```

but after renaming the same file to `a.heif`, everything works.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: NixOS 25.05
KDE Plasma Version: 
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1

ADDITIONAL INFORMATION

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