Automatic transcription
Automatic transcription turns a video's audio into text using speech recognition. From that text come subtitles, summaries, internal search and derived material, with no manual typing.
The most direct impact is accessibility and consumption: many people watch without sound, and subtitles decide whether they keep watching.
The second use is production. From one lesson's transcript you can generate descriptions, indexes and assessment questions in minutes, work that otherwise takes hours per hour of video.