Public bug reported:

Since updating to Ubuntu 26.04 (gnome 50, glycin 2.1.1+ds-0ubuntu1) I'm
unable to load any HEIC images, the following is displayed when opening
in image viewer:

Remote error: org.gnome.glycin.Error.LoadingError: glycin-
loaders/glycin-heif/src/main.rs:103:24: DecoderPluginError(Unspecified)
Decoder plugin generated an error: Unspecified

stderr: Setting process memory limit

Thumbnails are also no longer generated.


I originally raised this on the GNOME glycin project, however redirected here 
as it's a dependency related issue with the package: 
https://gitlab.gnome.org/GNOME/glycin/-/work_items/289

Copy pasting the response from there:

"I tested a fresh Ubuntu VM and can reproduce this. It looks like 
libheif-plugin-libde265 or libheif-plugin-ffmpegdec is not installed 
automatically, so you need one of these packages.
You might still want to report to Ubuntu that the dependencies for 
glycin-loaders seem wrong https://packages.ubuntu.com/resolute/glycin-loaders
It looks like the suggested packages are all encoders and the decoders are 
missing.

libheif-plugin-aomdec: HEIF and AVIF file format decoder and encoder

That's an AVID encode. The HEIF is confusing here, and isn't aomenc the
encoder?

libheif-plugin-x265: HEIF and AVIF file format decoder and encoder -
x265 plugin

Also sounds wrong. Why would x265 have anything to do with AVIF? And it's also 
just an encoder.
It's all explained here 
https://github.com/strukturag/libheif#supported-features";

** Affects: glycin (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2151173

Title:
  Unable to load HEIC images (dependency issue)

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