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An Optimal SVC Bitstream Schema for Viewport-dependent 360-degree Video Streaming by Shen, Gang; Ma, Mingyang; Xu, Guangxin is a scholarly article available to read on EtoBox.

What is An Optimal SVC Bitstream Schema for Viewport-dependent 360-degree Video Streaming about?

To deliver ultra-high resolution 360-degree video (such as 8K, 12K, or even higher) across the internet, viewport-dependent streaming becomes necessary to save bandwidth. During viewport switches, clients and servers will instantly exchange coordination info and contents for the given viewports. However, those viewport switches pose a serious challenge for video encoding because the temporal dependency between contents within changing viewports is unpredictable. In existing practices, it is commonly noted that GOP (Group of Pictures) size in a bitstream intrinsically prohibits the reduction of the viewport switch latency, such as Motion-to-photon (MTP) latency, or motion-to-high-quality (MTHQ) latency. In this paper, we presented a Scalable Video Coding (SVC) based bitstream schema, which can structurally remove the impacts of GOP in viewport-dependent streaming and provide instant viewport switches within one-frame time (the best possible). In addition, combined with tiling, this new coding schema allows an efficient packing of the non-adjacent regions within a viewport of 360-degree video. Our experiments also show that the overall encoding with this SVC-based approach is faster

Author

Shen, Gang; Ma, Mingyang; Xu, Guangxin

Published

2023

Language

EN