Non-Linear Editor for Text-Based Screencast

摘要

Screencasts, where computer screen is broadcast to a large audience on theweb, are becoming popular as an online educational tool. Among various types ofscreencast content, popular are the contents that involve text editing,including computer programming. There are emerging platforms that support suchtext-based screencasts by recording every character insertion/deletion from thecreator and reconstructing its playback on the viewer's screen. However, theseplatforms lack rich support for creating and editing the screencast itself,mainly due to the difficulty of manipulating recorded text changes; the changesare tightly coupled in sequence, thus modifying arbitrary part of the sequenceis not trivial. We present a non-linear editing tool for text-basedscreencasts. With the proposed selective history rewrite process, our editorallows users to substitute an arbitrary part of a text-based screencast whilepreserving overall consistency of the rest of the text-based screencast.