This post is part of the semi-annual blog series on file format research for the Sustainability of Digital Formats site at the Library of Congress, and provides updates on new and updated file format description documents.
The digital preservation landscape is ever-evolving, and the Library of Congress has recently made a significant update to its Recommended Formats Statement (RFS), to upgrade FFV1 (version 3) in Matroska (.mkv) container from an "Acceptable Format" to one of five "Preferred Formats" for the preservation and long-term access of video materials, reflecting its ongoing commitment to staying at the forefront of audiovisual preservation.