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Channel adaptive video stream switching for broadband wireless links

journal contribution
posted on 2023-02-07, 03:16 authored by B Partov Poor, M Fleury, Muhammad Waseem Altaf, M Ghanbari
This paper exploits an H.264/Advanced Video Coding codec's smooth stream switching to achieve robust video delivery across an IEEE 802.16 (WiMAX) broadband wireless link. As the wireless channel conditions vary over time, dynamic selection of bitrate and corresponding video quality will reduce the risk of harmful packet loss. The paper investigates choice of stream-switching with Secondary SP-frames or SI-frames relative to the selection of quantization parameter (QP) values. To control the switching points at the WiMAX server, the proposed scheme applies a feedback mechanism that monitors packet loss. As an additional suggestion, the paper considers an adaptive ARQ scheme to protect switching frames against packet loss. In summary, the broadband wireless streaming system gives more protection to higher quality video, reduces delay and packet loss, and improves received video quality. In particular, for the QP values selected, results show that increased quality primary-switching frames together with SI frames bring a significant gain in video quality compared with other switching schemes with secondary SP-frames. The other schemes in turn show an improvement to using 'no switching' when streaming takes place over a typical WiMAX channel with burst errors. Link delay is also reduced. © 2011 Springer-Verlag.

History

Journal

Multimedia Systems

Volume

17

Pagination

449-463

ISSN

0942-4962

eISSN

1432-1882

Language

en

Issue

5

Publisher

Springer Science and Business Media LLC