Viewing by interactions: media-oriented operators for reviewing recorded sessions on tv

When generating records from captured meetings, such as video lectures or distance education activities supported by synchronous communication tools, the alternative usually adopted is to generate a linear video with the contents of the exchanged media. Such approach limits the review of the meeting, reducing it to watching a video using the traditional time-based video controls. In other scenarios, the literature reports the use of media-based operators, like ink-based and audio-based operators, that allow the indexing of points of interaction in the resulting document. In this paper we tackle the issue of automatically generating document-based browsers by means of several types of indexes captured during recording and post-production phases of the multimedia production process. These indexes are used to provide an interface focused on menu navigation to create compositions of logical operators in order to improve the access to points of interest by generating interactive timelines. Our document-centric approach tackles challenges for meeting browsers: in particular, the approach enables the efficient review of meeting recordings via a constrained device such as a TV set-top box and a remote control. In terms of evaluation, we conducted two user studies in order to verify our model. Overall, the evaluation results suggested that the approach provided a satisfactory level of usability and that users understood the proposed menu navigation approach to review the recorded sessions.