عنوان انگلیسی مقاله:
Overlay live video streaming with heterogeneous bitrate requirements
ترجمه فارسی عنوان مقاله:
همپوشانی جریان تصویر ویدئویی زنده با ملزومات میزان ارسال بیت ناهمگن
sciencedirect-Computer Networks 74 (2014) 53–63
We study a streaming cloud formed by distributed proxies providing live video service to diverse users (e.g., smart TVs, PCs, tablets, mobile phones, etc.). The proxies form a pushbased overlay network, with each proxy serving a certain video bitrate for users to join. To form a proxy overlay serving heterogeneous bitrates, we consider that the video is encoded into multiple MDC (Multiple-Description Coding) streams with the serving bitrate of proxyi beingki description streams. In order to effectively mitigate stream disruption due to node churns, proxyi also joins an additionalri redundant MDC streams (ri P0) in such a way that all theðki þriÞstreams are supplied bydistinctparents. For live streaming, the critical issue is how to construct theparent-disjointtrees minimizing the assembly delay of the proxies. We present a realistic delay model capturing important system parameters and delay components, formulate the optimization problem and show that it is NP-hard. We propose a centralized algorithm which is useful for a centrally-managed network and serves as a benchmark for comparison (PADTrees-Centralized). For large network, we propose a simple and distributed algorithm which continuously reduces delay through overlay adaptation (PADTrees-Distributed). Through extensive simulation on real Internet topologies, we show that high stream continuity can be achieved with push-based trees in the presence of node churns. Our algorithms are simple and effective, achieving low loss and low delay.
قیمت: 1000 تومان