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The capture of lectures or similar presentations is of interest for several reasons. From the attendee's perspective, students may use the recordings when working on homework assignments or preparing for exams, or to watch the contents of a missed class. From the instructor's perspective, a captured lecture may be evaluated, recaptured for improvements, or reused as complementary learning material. Moreover, captured lectures may be a valuable resource for e-learning and distance education courses. In this paper we detail the design rationale associated with the development of a prototype platform for the ubiquitous capture of live presentations and their transformation into a corresponding interactive multi-video object. Our approach includes capturing important context information which, when incorporated into the multimedia object, enables one to interact with the recorded lecture in novel dimensions. We tested our prototype by using case studies involving instructors and students, which allowed us to identify important features and novel uses for the platform.

In most current digital TV applications the user interaction takes place by pressing keys on a remote control. For simple applications this type of interaction is sufficienthowever, as interactive applications become more popular new input devices are demanded. After discussing motivating scenarios, this paper presents an architecture that offers to applications running on a set-top-box the possibility of receiving multimodal data (audio, video, image, ink, accelerometer, text, voice and customized data) from multiple devices (such as mobile phones, PDAs, tablet PCs, notebooks or even desktops). We validated the architecture by implementing a corresponding multimodal interaction component which extends the Brazilian Digital TV middleware, and by building applications which use the component.

The problem of allowing user-centric control within multimedia presentations is important to document engineering when the presentations are specified as structured multimedia documents. In this paper we investigate the problem in the context of end-user "real-time" editing of interactive video programs.

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Abstract-The recording of lectures has become common as a way to produce video-based instructional material. Even though the material is often produced using more than one video source -the instructor and the slide, for instance -the result is usually a single video stream.We built a system prototype that allows the recording of several video streams associated with a lecture, including the instructor, projected slides, and information presented by the instructor via a computer (software or other videos, for instance). The several video streams, orchestrated using contextual and control information, are used to produce an interactive multi video object.The interactive nature of our novel multi video object offers students several alternatives for watching the lecture. When the multi video is used by students of traditional and distance learning courses, is opportune to investigate if there are differences in how students watch and interact with the multi video.We captured a problem solving lecture in the theme of Database Design our system. The resulting interactive multivideo object was offered to two groups of students as extra learning material, in preparation for exams. One of the groups attended a traditional, classroom-based course, and the other group attended a distance learning course. In this paper we first give a brief overview of our system, and then we present observations of how both groups of students interacted with the multi video multimedia learning object. We could observe, for instance, that students from the traditional course used the alternative views allowed by multi video more than students from the distance learning course, while students from the distance learning course spent more time watching and interacted more with the interactive multi video.

Watching TV is a practice many people enjoy and feel comfortable with. We propose the capture of the user interaction while interacting with a remote control to watch TV: such detailed information is most valuable to many applications and services. We discuss our proposed approach in the context of the Brazilian Interactive Digital TV platform.