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A practical methodology for guaranteeing quality of service for video-on-demand 

Date: 02/2000 Author(s): Zamora, Javier; Jacobs, S.; Eleftheriadis, A.; Chang, S.F.; Anastassiou, D. Document type: Article in Journal (refereed) A novel and simple approach for defining end-to-end quality of service (QoS) in video-on-demand (VoD) services is presented. Using this approach, we derive a schedulable region for a video server which guarantees end-to-end QoS, where a specific QoS required in the video client translates into a QoS specification for the video server. Our methodology ... More information

Implementing multiplexing, streaming, and server interaction for MPEG-4 

Date: 12/1999 Author(s): Kalva, H.; Tang, L.; Huard, J.F.; Zamora, Javier; et al. Document type: Article in Journal (refereed) We describe the implementation of a streaming client-server system for object-based audio-visual presentations in general and MPEG-4 content in particular. The system augments the MPEG-4 demonstration software implementation (IM1) for PCs by adding network-based operation with full support for the Delivery Multimedia Integration Framework (DMIF) specification, ... More information

Delivering object-based audio visual services 

Date: 11/1999 Author(s): Kalva, H.; Eleftheriadis, A.; Zamora, Javier Document type: Article in Journal (refereed) 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. In the case of object based presentations such as MPEG-4 presentations, the media data and the media composition data are transmitted to ... More information

Objective and subjective quality of service performance of video-on-demand in ATM-WAN 

Date: 05/1999 Author(s): Zamora, Javier; Anastassiou, D.; Chang, S.F.; Ulbricht, L. Document type: Article in Journal (refereed) The Columbia VoD testbed is used to study the impact of a long distance and multi-switch connection and extreme conditions of impairments (delay variation, loss and error) on the objective and subjective Quality of Service (QoS) for VoD. This paper extends our preliminary results of the Columbia VoD testbed in an ATM-LAN. We compare the QoS performance ... More information

Columbia's VoD and multimedia research testbed with heterogeneous network support 

Date: 09/1997 Author(s): Chang, S.F.; Eleftheriadis, A.; Jacobs, S.; Kalva, H.; Zamora, Javier Document type: Article in Journal (refereed) This paper reports our progress in developing an advanced video-on-demand (VoD) testbed, which will be used to accommodate various multimedia research and applications such as Electronic News on Demand, Columbia’s Video Course Network, and Digital Libraries. The testbed supports delivery of MPEG-2 audio/video stored as transport streams over various ... More information
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