This paper derives optimal spatial scaling and rate control parameters for power-efficient wireless video streaming on portable devices. A video streaming application is studied, which receives a high-resolution and high-quality video stream from a remote server and displays the content to the end-user.We show that the resolution of the input video can be adjusted such that the quality-power trade-off is optimized. Making use of a power model from the literature and subjective quality evaluation using a perceptual metric, we derive optimal combinations of the scaling factor and the rate-control parameter for encoding. For HD sequences, up to 10% of power can be saved at negligible quality losses and up to 15% of power can be saved at tolerable distortions. To show general validity, the method was tested for Wi-Fi and a mobile network as well as for two different smartphones.
@article{arxiv.2307.08337,
title = {Power-Efficient Video Streaming on Mobile Devices Using Optimal Spatial Scaling},
author = {Christian Herglotz and André Kaup and Stéphane Coulombe and Ahmad Vakili},
journal= {arXiv preprint arXiv:2307.08337},
year = {2023}
}