@KristijanZic In cleaning up for retirement, I released that issue from the v0.27.4 milestone. The code to read ISOBMFF (.cr3, .heic, .jp2 and .avif) is in the code in my book and tested using files from the raw.Pixls.us archive. It’s working well.
I haven’t investigated the effort necessary to port that code to Exiv2, however it’s modest. It can probably be up and running in a day. I’m looking forward to seeing somebody stepping forward to make that happen. I will of course help as required.
After discussion of the legal situation with Dave Houlder, our recommendation is that Exiv2 should join the Open Invention Network. Exiv2 requires a maintainer to manage and steer the project into the future. Once more, I look forward to seeing somebody volunteer and to assure them of my support.