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Recording and Playing Back Interactive Media Streams

Author(s): Volker Hilt, Martin Mauve, Jürgen Vogel, Wolfgang Effelsberg.
Title: Recording and Playing Back Interactive Media Streams
Published: Accepted for publication in: IEEE Transactions on Multimedia (), pp. , 2004
Keyword(s): interactive media, recording, random access, media server
Abstract: Recording systems and media server for networked audio and videostreams have become an important part of today's Internet. In contrastto this, only a few recording and playback solutions currently existfor the data streams of interactive media applications (e.g., sharedwhiteboards and distributed virtual environments). So far thesesolutions are application-specific: individual algorithms andimplementations are required for each application that is to berecorded. In this paper, we are proposing generic algorithms for therecording and playback of interactive media streams. These algorithmsare based on a common model for the class of interactive media. Theyenable full random access to recordings by initializing the replayingapplications with the required state information (e.g., the currentslide in a recorded presentation). We have implemented thesealgorithms in the Interactive Media on Demand (IMoD) system. In orderto interpret the semantics of an interactive media stream, the IMoDsystem requires that the RTP/I protocol is used for the framing of thetransmitted data. Any application using RTP/I can be recorded directlyusing the IMoD system without any modification. Interactive mediastreams not using RTP/I can be recorded using the generic recordingalgorithms. However, they require an adaptation of the IMoD system sothat it is able to extract a minimal set of information from theapplication-level protocol of these streams. In addition to thegeneric recording algorithms, we present the architecture and majordesign considerations of the IMoD system and discuss the experiencesgained from recording different interactive media applications.
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