S.-F. Chang et. al, "Columbia's VoD and Multimedia Research Testbed with Heterogeneous Network Support", Journal on Multimedia Tools and Applications, Special Issue on Video on Demand, Kluwer Academic Publishers, Vol. 5, Nr. 2, September 1997, pp. 171-184.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... Columbia University, New York # Xbind, Inc. New York Abstract Delivery of audio visual objects differs from the traditional video on demand systems in the characteristics of the presentations delivered. Video on demand has mainly been about delivering MPEG 2 audio and video[1]. In the case of object based presentations such as MPEG 4 presentations, the media data and the media composition data are transmitted to a client as separate streams, typically with different QOS requirements, in the same session. Furthermore, as the number of objects in a presentation can be ....

S.-F. Chang et. al, "Columbia's VoD and Multimedia Research Testbed with Heterogeneous Network Support", Journal on Multimedia Tools and Applications, Special Issue on Video on Demand, Kluwer Academic Publishers, Vol. 5, Nr. 2, September 1997, pp. 171-184.

.... case of a shortage of network resources) or at the receiver (in case timely display is impossible) Type of filtering There are several ways to filter a video stream and to reduce its bandwidth: Framedropping [3] 15] 7] 11] 5] low pass filtering [15] color reduction [15] re quantization [15][6], and transcoding [15] 2] Another approach is hierarchical filtering: The layering coding scheme for MPEG presented by Li et al. 10] multicasts three video streams. Each receiver subscribes to the base stream consisting of the I frames. Depending on its capabilities, a receiver can additionally ....

....packets. The Continuous Media Player [11] pursues the second strategy by employing Cyclic UDP [14] which retransmits lost high priority data (i.e. I frames in the case of MPEG video) to give them a better chance to reach the destination. In the Vosaic player [7] and in Columbia s VoD testbed [6], a client can demand retransmission of a lost frame. FEC is applied by Nonnenmacher et al. 12] where requests for retransmissions are handled by FEC transmissions. Adaptation algorithms The Vosaic player [7] continually measures the rate of frames dropped by the receiver due to missing CPU ....

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S.-F. Chang, D. Eleftheriadis, D. Anastassiou, S. Jacobs, H. Kalva, and J. Zamora. Columbia's VOD and Multimedia Research Testbed With Heterogeneous Network Support. Journal on Multimedia Tools and Applications, 5(2):171--184, Sept 1997.

....interaction within the entire system. The emergence of Multimedia on Demand as a potential application for cable subscribers or Internet users has fueled research into ways to store and stream digital audiovisual information. There have been several efforts to build prototype systems (see [12][13][60] and references therein) and several trials for commercial services. Actual offerings, at least in the U.S. have not been forthcoming as the business issues do not yet seem to match the market s requirements. New issues in developing content aware middleware and optimal resource allocation ....

S.-F. Chang, A. Eleftheriadis, D. Anastassiou, S. Jacobs, H. Kalva, and J. Zamora, "Columbia's VoD and Multimedia Research Testbed with Heterogeneous Network Support", Journal on Multimedia Tools and Applications, Special Issue on Video on Demand, Kluwer Academic Publishers, Vol. 5, Nr. 2, September 1997, pp. 181--184.

....The second in a series of DAVIC interoperability events will be held during the Tokyo electronic show in October 1996. This event also includes S3 flow interoperability in addition to S1 and S2 flows. Acknowledgments Acknowledgments are due to the other members of Columbia s VOD team [10] for their contributions to the testbed. Acknowledgments are also due to the organizations and their representatives (primary contact listed below) that took part in the event. CSELT, Italy: Stefano Dal Lago e mail: stefano.dallago cselt.stet.it DeTe Berkom, Germany: Hans Werner Bitzer e mail: ....

S.-F. Chang, A. Eleftheriadis, D. Anastassiou, S. Jacobs, H. Kalva, and J. Zamora, "Columbia's VoD and Multimedia Research Testbed With Heterogeneous Network Support, " appears in this special issue, Intern. J. on Multimedia Tools and Applications, Kluwer Academic Publishers, May, 1997.

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S.-F. Chang et. al, "Columbia's VoD and Multimedia Research Testbed with Heterogeneous Network Support", Journal on Multimedia Tools and Applications, Special Issue on Video on Demand, Kluwer Academic Publishers, Vol. 5, Nr. 2, September 1997, pp. 171-184.

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