mMOD: the multicast Media-on-Demand system

This paper presents the multicast Media-onDemand system, mMOD, which is an on-demand system designed for recording and playback of not only audio and video but also other media that are being multicast on the Internet/MBone today. The system allows for users to request playback of recorded sessions containing MBone audio, video, whiteboard, NetText, mWeb (a distributed HTML presentation system) or any other UDP-multicast distributed session. It also allows for random access within these recordings. The system include a Web-interface for starting and controlling running sessions. To compensate for jitter and out-of-order packets, sessions distributed in RTPformat (RFC1889), can be reconstructed with new time-stamps. 1 Introduction A video-on-demand system (VOD) is a system that serves a number of clients with audio and video on their request, and that are usually limited to these two media. Normally one channel is allocated per request and receiver and this leads to resources being ti..