In this paper, we design, implement, and evaluate , which is to our knowledge the first consumer-class system that streams panoramic videos far beyond the ultra high-definition resolution (up to 16K) to mobile devices, offering truly immersive experiences. Such an immense resolution makes streaming video-on-demand (VoD) content extremely resource-demanding. To tackle this challenge, introduces a novel framework that leverages an edge server to perform efficient, intelligent, and quality-guaranteed content transcoding, by extracting from panoramic frames the viewport stream that will be delivered to the client. To support real-time transcoding of 16K content, employs several key mechanisms such as dual-GPU acceleration, lossless viewport extraction, deep viewport prediction, and a two-layer streaming design. Our extensive evaluations using real users' viewport movement data indicate that outperforms existing solutions, and can smoothly stream 16K panoramic videos to mobile devices over diverse wireless networks including WiFi, LTE, and mmWave 5G.
|Original language||English (US)|
|Title of host publication||The Web Conference 2021 - Proceedings of the World Wide Web Conference, WWW 2021|
|Publisher||Association for Computing Machinery, Inc|
|Number of pages||13|
|State||Published - Apr 19 2021|
|Event||2021 World Wide Web Conference, WWW 2021 - Ljubljana, Slovenia|
Duration: Apr 19 2021 → Apr 23 2021
|Name||The Web Conference 2021 - Proceedings of the World Wide Web Conference, WWW 2021|
|Conference||2021 World Wide Web Conference, WWW 2021|
|Period||4/19/21 → 4/23/21|
Bibliographical noteFunding Information:
We thank the anonymous reviewers for their comments. This work was supported in part by NSF Award #1903880 and #1915122, Project 16214817 from the Research Grants Council of Hong Kong, and the 5GEAR and FIT projects from Academy of Finland.
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