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DAg-stream: Distributed video adaptation for overlay streaming to heterogeneous devices

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Abstract

Combining the advantages of Peer-to-Peer (P2P) content distribution concept and metadata driven adaptation of videos in compressed domain, in this paper, we propose a simple but scalable design of distributed adaptation and overlay streaming using MPEG-21 gBSD, called DAg-stream. The objective is not only to shift the bandwidth burden to end participating peers, but also to move the computation load for adapting video contents away from dedicated media-streaming/adaptation servers. It is an initiative to merge the adaptation operations and the P2P streaming basics to support the expansion of context-aware mobile P2P systems. DAg-stream organizes mobile and heterogeneous peers into overlays. For each video, a separate overlay is formed. No control message is exchanged among peers for overlay maintenance. We present a combination of infrastructure-centric and application end-point architecture. The infrastructure-centric architecture refers to a tree controller, named DAg-master, which is responsible for tree/overlay administering and maintenance. The application end-point architecture refers to video sharing, streaming and adaptation by the participating resourceful peers. The motivation for this work is based on the experiences and lessons learned so far about developing a video adaptation system for heterogeneous devices. In this article, we present our architecture and some experimental evaluations supporting the design concept for overlay video streaming and online adaptation.

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Notes

  1. The term “node” is used interchangeably with “peer” and “client” throughout this manuscript.

  2. Share-ratio is calculated from the total amount of data uploaded over total amount of data downloaded.

  3. ‘Frameset’ refers to the number of frames equal to the frame rate at which the raw video is being encoded (usually 30 fps). After adaptation for 15 frames per second (fps), there will be 15 frames in each frameset of that clip/video.

  4. I = Intra Frame, B = Bi-directional Frame, P = Inter Frame.

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Authors and Affiliations

  1. School of Information Technology and Engineering (SITE), University of Ottawa, 800 King Edward Avenue, Ottawa, Ontario, K1N 6N5, Canada

    Razib Iqbal & Shervin Shirmohammadi

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  1. Razib Iqbal
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  2. Shervin Shirmohammadi
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Correspondence to Razib Iqbal.

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Iqbal, R., Shirmohammadi, S. DAg-stream: Distributed video adaptation for overlay streaming to heterogeneous devices. Peer-to-Peer Netw. Appl. 2, 202–216 (2009). https://doi.org/10.1007/s12083-009-0031-0

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  • DOI: https://doi.org/10.1007/s12083-009-0031-0

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