# EVSO: Environment-aware Video Streaming Optimization of Power Consumption

## TL;DR

EVSO is a system that reduces energy consumption in mobile video streaming by adaptively adjusting frame rates based on perceptual similarity and user battery status, maintaining quality while saving power.

## Contribution

This paper introduces EVSO, a novel environment-aware video streaming system that adaptively adjusts video quality based on perceptual similarity and device battery status.

## Key findings

- Reduces energy consumption by 22% on average
- Maintains user experience quality despite power saving
- Effective across various video types and network conditions

## Abstract

Streaming services gradually support high-quality videos for better user experience. However, streaming high-quality video on mobile devices consumes a considerable amount of energy. This paper presents the design and prototype of EVSO, which achieves power saving by applying adaptive frame rates to parts of videos with a little degradation of the user experience. EVSO utilizes a novel perceptual similarity measurement method based on human visual perception specialized for a video encoder. We also extend the media presentation description, in which the video content is selected based only on the network bandwidth, to allow for additional consideration of the user's battery status. EVSO's streaming server preprocesses the video into several processed videos according to the similarity intensity of each part of the video and then provides the client with the processed video suitable for the network bandwidth and the battery status of the client's mobile device. The EVSO system was implemented on the commonly used H.264/AVC encoder. We conduct various experiments and a user study with nine videos. Our experimental results show that EVSO effectively reduces energy consumption when mobile devices use streaming services by 22% on average and up to 27% while maintaining the quality of the user experience.