Scholl, J; Parnes, P; McCarthy, JD; Sasse, MA; (2005) Designing a Large-Scale Video Chat Application. In: Zhang, H and Chua, T-S and Steinmetz, R and Kankanhalli, MS and Wilcox, L, (eds.) Proceedings of the 13th annual ACM international conference on Multimedia MULTIMEDIA '05. (pp. 71 - 80). ACM: USA: New York.

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Abstract

Studies of video conferencing systems generally foc us on scenarios where users communicate using an audio channel. However, text chat serves users in a wide variety of contexts, and is commonly included in multimedia conferencing systems as a complement to the audio channel. This paper introduces a prototype application which integrates video and text communication, and describes a formative evaluation of the prototype with 53 users in a social setting. We focus the evaluation on bandwidth and view navigation requirements in order to determine how to better serve users with video chat, and discuss how the findings from this evaluation can inform the design of future video chat applications. Bandwidth requirements are evaluated through user perceptions of video delivered using three different bandwidth schemes. For view navigation, we examine a system that automatically switches the video focus to the current “chatter”, instead of requiring users to navigate manually to find the video steam they are interested in viewing.

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