Hi @zhuvoy, you're probably missing one of the libraries that libheif needs, like x265. There are some short notes here:

https://github.com/libvips/libvips?tab=readme-ov-file#libheif

The vipsdisp build file is here:

https://github.com/jcupitt/vipsdisp/blob/master/org.libvips.vipsdisp.json

It uses the Gnome SDK which includes libheif (conveniently), but it might be helpful.

Hi @jcupitt, the flatpak manifest contains build instruction for libde265, x265 and libheif.
Libheif build indicates, that it has found these libs:
`libde265 HEVC decoder : + built-in
FFMPEG HEVC decoder (HW acc) : - disabled
x265 HEVC encoder : + built-in

=== Supported formats ===
format decoding encoding
HEIC YES YES
AVIF YES YES `

Libvips seems finds the libheif build:
Run-time dependency libheif found: YES 1.18.2 Checking for function "heif_encoder_parameter_get_valid_integer_values" with dependency libheif: YES Checking whether type "struct heif_encoding_options" has member "output_nclx_profile" with dependency libheif: YES Checking whether type "struct heif_encoding_options" has member "image_orientation" with dependency libheif: YES Checking for function "heif_get_disabled_security_limits" with dependency libheif: NO Checking whether type "struct heif_security_limits" has member "max_total_memory" with dependency libheif: NO

It is also troubling, that neither JP2 read/writes works, despite building the same openjpeg version, with the same build options as in org.libvips.vipsdisp.json.
Run-time dependency libopenjp2 found: YES 2.5.3

Thanks!