Design and Implementation of Low-Power Video Streaming System for Mobile Devices
Date Issued
2008
Date
2008
Author(s)
Hu, Sen-Po
Abstract
Optimal balance between power consumption and performance is a great challenge for mobile multimedia system. In this thesis, a new metric called QE ratio is proposed to evaluate the energy efficiency of a low-power mobile multimedia system. A system with higher QE ratio represents more qualityf service is provided while consuming per unit battery energy. To achieve high QE ratio on mobile device, I construct a low-power video streaming system which combines a frame-based DVFS technique and dynamic quality adaption. The DVFS technique changes CPU speed according to frame-basedorkload prediction by utilizing performance counters in modern microprocessor. With effective DVFS techinque, CPU power consumption can be reduced so as to improve QE ratio. Besides, dynamic quality adaptation is proposed to improve QE ratio by periodically adjusting the values of encoding quality parameters for video bitstream. The proposed low-power video streaming system has been implemented on an Xscale-based embedded platform. The experimental result shows the proposed system gains at least 10% improvement of QE ratio on mobile device.
Subjects
Video Streaming
DVFS
QE Ratio
Image Quality
Mobile Device
Embedded System
SDGs
Type
thesis
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