Over the past decade much focus has been placed on mass digitization of legacy audiovisual collections. With progress on this front, today there is a new focus emerging: mass description. In 2014 Indiana University (IU) began an effort to digitize hundreds of thousands of hours of audiovisual materials from across campus, leading to the challenge of describing this extraordinarily diverse set of materials both at scale and at a sufficient level of granularity to enable meaningful and effective discovery. In 2015, with the support of AVPreserve, IU began a strategic planning project to research, analyze and report on technologies, workflows, staffing, timeline and budgets to address this challenge. This presentation, given by Jon Dunn and Chris Lacinak at the Association of Moving Image Archivists (AMIA) conference in 2016, delves into the background, goals, approach and next steps of this work.