Efficient support for interactive operations in multi-resolution video servers |
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Authors: | Prashant J. Shenoy Harrick M. Vin |
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Affiliation: | (1) Distributed Multimedia Computing Laboratory, Department of Computer Sciences, University of Texas at Austin, Taylor Hall 2.124, Austin, TX 78712-1188, USA; e-mail: {shenoy,vin}@cs.utexas.edu; URL: http://www.cs.utexas.edu/users/dmcl , US |
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Abstract: | In this paper, we present a placement algorithm that interleaves multi-resolution video streams on a disk array and enables a video server to efficiently support playback of these streams at different resolution levels. We then combine this placement algorithm with a scalable compression technique to efficiently support interactive scan operations (i.e., fast-forward and rewind). We present an analytical model for evaluating the impact of the scan operations on the performance of disk-arr ay-based servers. Our experiments demonstrate that: (1) employing our placement algorithm substantially reduces seek and rotational latency overhead during playback, and (2) exploiting the characteristics of video streams and human perceptual tolerances enables a server to support interactive scan operations without any additional overhead. |
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Keywords: | :Multi-resolution video servers – Multi-resolution playback – Scan operations – Fast-forward – Rewind – Disk arrays – Scalable compression |
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