Author and sole maintainer of libheif (HEIF/AVIF file format library) and libde265 (H.265/HEVC decoder). These libraries are used by practically all open-source software that reads or writes HEIC and AVIF images, including ImageMagick, GIMP, libvips/sharp, Pillow, darktable, digiKam, GDAL and the GNOME and KDE desktops, and through these by a large number of web services and image pipelines. The work is currently almost entirely unfunded: in 2026 alone, 37 security advisories had to be investigated, fixed and released in unpaid evenings and weekends.
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