資訊工程學系

Permanent URI for this communityhttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/60

本系前身「資訊教育學系」成立於民國七十四年,首先招收大學部學生,民國九十年成立資訊工程研究所碩士班,而後於民國九十五年進行系、所調整合併為「資訊工程學系」;並於九十六年成立博士班。本系目前每年約招收大學部四十餘人,碩士班六十餘人,博士班約五人,截至民國一百零四年十一月止,總計現有大學部一百九十多人,碩士班一百二十多人,博士班二十三人,合計學生人數約為三百三十多位。

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    Streaming with Real Bitrates and Solving Bandwidth Competition on Bottleneck in DASH
    (2016) 王明宇; Wang, Ming-Yu
    HTTP adaptive streaming is increasingly popular in multimedia delivery nowadays. The nature of HTTP provides easy deployment to content provider and chunk-based delivery enables dynamic adaption of video quality to varying network bandwidth. In this paper, we address two topics in HTTP adaptive streaming. First is the impact of bitrate disparity. In the previous work, it shows that the advertised bitrates by manifest file and the actual bitrates are significantly different. The result of inaccurate estimation causes buffer oscillations or even buffer underrun because clients frequently select higher bitrates than the network bandwidth. To employ the extensibility feature of DASH syntax, we present a systematic method for selecting the segment which real bitrate is the closest one to the given estimated throughput. The second topic is the well-known bandwidth competition on the bottleneck. We adopt logistic function to estimate bandwidth while using it to detect occurrences of bandwidth oscillations due to competition. We propose an algorithm written on client side to stabilize the requested bitrates in competition interval. The experiments show that our solutions stabilize client behavior in competition state and streaming with real bitrates improves buffer oscillations.