İhsan Mert Özçelik defended his PhD thesis with the title QUALITY OF EXPERIENCE - DRIVEN DYNAMIC ADAPTIVE STREAMING OVER HTTP

Dynamic Adaptive Streaming over HTTP (DASH) became the pillar of multimedia content delivery mechanisms in the last decade. Given fluctuating network conditions, over-the-top content platforms struggle with delivering a high quality of experience (QoE) and uninterrupted playback sessions. To overcome this difficulty, they keep multiple quality levels of the same content in a fragmented way. This mechanism enables players to adapt the video quality to varying network conditions by changing the video bitrate at the fragment boundaries. To maximize the QoE, adaptive bitrate algorithms have been widely studied in the literature with promising results. However, the majority of the state-of-the-art solutions do not take into account the presence of multiple DASH clients on the shared bottleneck link, whereas the existing studies considering multiple DASH players in the same network do not consider the diversity of fragment durations among different video titles, background traffic and users' privacy. Those gaps cause QoE fairness and stability problems along with feasibility concerns. First, to address these problems, we propose a centralized module assisted adaptation mechanism with a lightweight Software-Defined Networking (SDN) integration for on-demand video streaming. Second, we leverage our proposed SDN-assisted mechanism to deliver QoE-driven low-latency live event streaming over HTTP. Third, we implement a live streaming DASH client with a novel bandwidth measurement heuristic without requiring any extra component to the legacy systems. It reduces the live delay between the actual event to users' screens down to 1s. As a final contribution, we present a deep reinforcement learning framework to adapt the playback speed and video bitrate to maximize QoE in live streaming.

Bize Ulaşın

Bilgisayar Mühendisliği Bölümü, Boğaziçi Üniversitesi,
34342 Bebek, İstanbul, Türkiye

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