As the lecture plays, the time-scale fills to show the user how far through
the lecture they are. The highlighted item within the hypertext links
shows the current topic. The user can browse through the lecture
using the time-scale widget (dragging or clicking on the target time),
and using the topic index.
Using a cameraperson rather than a stationary mounted camera means that
the video-stream can focus in on the most relevant activity/information
in the lecture.
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