  This paper presents a technology that enables the watching of videos at very
high speed. Subtitles are widely used in DVD movies, and provide useful
supplemental information for understanding video contents. We propose a
"two-level fast-forwarding" scheme for videos with subtitles, which controls
the speed of playback depending on the context: very fast during segments
without language, such as subtitles or speech, and "understandably fast" during
segments with such language. This makes it possible to watch videos at a higher
speed than usual while preserving the entertainment values of the contents. We
also propose "centering" and "fading" features for the display of subtitles to
reduce fatigue when watching high-speed video. We implement a versatile video
encoder that enables movie viewing with two-level fast-forwarding on any mobile
device by specifying the speed of playback, the reading rate, or the overall
viewing time. The effectiveness of our proposed method was demonstrated in an
evaluation study.

Human-Computer Interaction