Hi, it is not planned that libisofs will ever support UDF. So libisoburn will not be able to produce UDF.
As for the Y2027 bug in genisoimage, this is a problem which should be fixed there. genisoimage not only does UDF but also prepares images for video DVD, which is out of the scope of libisofs, too. The main obstacle for a fix in genisoimage is its lack of a Debian maintainer. One would have to prepare a patch like those in https://sources.debian.org/src/cdrkit/9%3A1.1.11-5/debian/patches and then talk e.g. debian-mentors mailinglist into helping to bring this patch into the cdrkit package. Have a nice day :) Thomas
