One addition for XnView 1.9.2 Mac Sonoma:
The export dialog doesn't even show AVIF as tab, although selected in the settings Formats menu.
Other selected formats show up correctly.
AVIF Conversion Error "Not a Picture" | XnConvert Mac
Moderators: helmut, XnTriq, xnview, Dreamer
Re: AVIF Conversion Error "Not a Picture" | XnConvert Mac
i've tried on MacOS 15 and it workschristb wrote: Fri Jun 27, 2025 11:18 pm just had the chance to test XnView MP 1.9.2 (now I can see the convert dialog). But unfortunately, both Export and Batch Converting to AVIF lead to the same exact issue. My system is still as described in my post (MacBook Pro 16", 2019, Intel, MacOS Sonoma, now 14.7.5)
Pierre.