Smooth Viewport Bitrate Adaptation for 360 Video Streaming
Hoang Le Dieu Huong, Duc V. Nguyen, Trương Thu Hương, Pham Ngoc Nam, Truong Cong Thang · 2019 6th NAFOSTED Conference on Information and Computer Science (NICS) · 2019
In Virtual Reality, 360-degree video is a major content type that provides immersive viewing experience for users. In this paper, we propose S-VAS, a new adaptation method for 360-degree video streaming, which can provide users with smooth viewport bitrate under network bandwidth variations and time-varying user head movements. Our proposed method adapts the number of extension tiles according to viewport prediction errors. Besides, variations in bitrate between adjacent tiles in a segment are mitigated by a novel tile version selection algorithm. Experimental results show that the proposed method can reduce the inter-segment bitrate variation by up to 46% and the intra-segment bitrate variation by up to 32%.