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The global, cross-sector conference and exhibition
on technology-supported learning and training

Berlin, December 1 — 3, 2021


Presentations PST411

How to Efficiently Improve Barrier Free Access on Recorded Lectures by Semi-Automatically Adding Closed Captions

Date Thursday, Dec 3  Time   –    Room

With the availability of affordable high-quality recording hardware and video management platforms lecture recording becomes a popular service for students at a steadily increasing number of universities. Since each university has its own infrastructure and general conditions, the introduction is still an individual pro-cess requiring a lot of technical know-how and a clear definition of the workflow process. At our university we currently have about 620 recorded lectures, provid-ing students access via our Learning Management System (LMS) Moodle and via an open source video portal. With a main focus on barrier-free access to learn-ing material in general and hearing-impaired students in specific, we wanted to provide subtitles for all recordings. In addition, subtitles are also very helpful for students who do not have German (our main university language) as their mother tongue. Subtitles should be at least in German, preferably also in other languages in order to support foreign students (such as Erasmus) at our university as well. In this paper we will share our experiences how to efficiently create subtitles in a semi-automatic way. Furthermore, we will share the lessons learned with the in-troduction of the Open Cast platform and which technical workflow we particu-larly defined. This workflow is optimized for a moderate growth of recorded lec-tures – hence feasible for small and medium sized universities – and ensures a maximum of quality. It can be easily adapted to other universities.


OEB speaker Herwig Rehatschek

Herwig Rehatschek

deputy head executive department learning with media, Medical University of Graz, Austria