Today, videos can be replayed on modern handheld devices, such as multimedia cellphones and personal digital assistants (PDAs), due to significant improvements in their processing power. However, screen size remains a limiting resource making it hard, if not impossible to adapt common approaches for video browsing to such mobile devices. In this paper we propose a new interface for the pen-based navigation of videos on PDAs and multimedia cellphones. Our solution -called the MobileZoomSlider -enables users to intuitively skim a video along the timeline on different granularity levels. In addition, it allows for continuous manipulation of replay speed for browsing purposes. Both interaction concepts are seamlessly integrated into the overall interface, thus taking optimum advantage of the limited screen space. Our claims are verified with a first evaluation which proves the suitability of the overall concept.
In this demonstration we present three interface designs which enable users to visually browse video data by moving a slider thumb along the timeline. In such a case, scrolling granularity is usually limited because of the fixed length of the corresponding slider. In contrast, our interaction designs enable users to skim the data at different granularity levels by providing the possibility to continuously change the slider's scale, by using a nonlinear scale, and by enabling interactive manipulation of the scrolling speed, respectively.
KeywordsMultimedia user interfaces and interaction, dynamic video browsing, advanced interface design.
Today's interfaces for time-scaled audio replay have limitations especially regarding highly interactive tasks such as skimming and searching, which require quick temporary speed changes. Motivated by this shortcoming, we introduce a new interaction technique for speech skimming based on the so called rubberband metaphor. We propose an "elastic" audio slider which is especially useful for temporary manipulation of replay speed and which integrates seamlessly into standard interface designs. The feasibility of this concept is proven by an initial user study.
Figure 1. Audio player interface with audio progress bar("Audio progress") and speed control slider ("Speed").
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