build libavif with DAVIF_BUILD_GDK_PIXBUF=ON then build gdk-pixbuf then gdk-sharp and format will apear so I guess it is a maintainer problem to build the whole chain to have it on gdk-sharp with libavif.
So best is open a ticket + PR to gtk-sharp lib to add dependency
it seems that libavif have a gdk pixbuf module : /github. com/AOMediaCode c/libavif/ pull/182/ files /gitlab. gnome.org/ GNOME/gdk- pixbuf/ -/merge_ requests/ 76
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build libavif with DAVIF_BUILD_ GDK_PIXBUF= ON then build gdk-pixbuf then gdk-sharp and format will apear so I guess it is a maintainer problem to build the whole chain to have it on gdk-sharp with libavif.
So best is open a ticket + PR to gtk-sharp lib to add dependency