# Adaptive 360 VR Video Streaming based on MPEG-DASH SRD

## TL;DR

This paper presents a novel adaptive 360 VR video streaming system utilizing MPEG-DASH SRD, which spatially partitions videos and prioritizes view-dependent tiles to significantly reduce bandwidth usage while maintaining quality.

## Contribution

It extends MPEG-DASH SRD to 3D space for 360 VR videos and introduces a view-aware adaptation technique with a new 3D geometry mesh for efficient streaming.

## Key findings

- Achieves up to 72% bandwidth savings
- Maintains video quality with minor negative impacts
- Demonstrates effective view-aware adaptation in VR streaming

## Abstract

We demonstrate an adaptive bandwidth-efficient 360 VR video streaming system based on MPEG-DASH SRD. We extend MPEG-DASH SRD to the 3D space of 360 VR videos, and showcase a dynamic view-aware adaptation technique to tackle the high bandwidth demands of streaming 360 VR videos to wireless VR headsets. We spatially partition the underlying 3D mesh into multiple 3D sub-meshes, and construct an efficient 3D geometry mesh called hexaface sphere to optimally represent tiled 360 VR videos in the 3D space. We then spatially divide the 360 videos into multiple tiles while encoding and packaging, use MPEG-DASH SRD to describe the spatial relationship of tiles in the 3D space, and prioritize the tiles in the Field of View (FoV) for view-aware adaptation. Our initial evaluation results show that we can save up to 72% of the required bandwidth on 360 VR video streaming with minor negative quality impacts compared to the baseline scenario when no adaptations is applied.