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A Metadata-enabled Approach for Scalable Video Streaming in Heterogeneous Networks
Thang, Truong Cong,Le, Hung T.,Nguyen, Duc V.,Pham, Anh T. Korea Multimedia Society 2015 The journal of multimedia information system Vol.2 No.1
In today's pervasive computing environments, multimedia content should be adapted to meet various conditions of network connections, terminals, and user characteristics. Scalable Video Coding (SVC) is a key solution for video communication over heterogeneous networks, where user terminals have different capabilities. This paper presents a standard-compliant approach that adapts an SVC bitstream to support multiple users. The adaptation problem is formulated as an optimization problem, focusing on the tradeoff between qualities of different spatial layers of an SVC video. Then the adaptation process is represented by standard metadata of MPEG-21, which can be solved by universal processing to enable interoperable and automatic operation. Our approach provides the users with optimal quality, a wide flexibility, and seamless adaptation. To the best of our knowledge, this is the first study that shows the adaptation tradeoff between spatial layers of a conforming SVC bitstream.
Adaptive Video Streaming over HTTP with Dynamic Resource Estimation
Truong Cong Thang,Hung T. Le,Hoc X. Nguyen,Anh T. Pham,강정원,노용만 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
Adaptive hypertext transfer protocol (HTTP) streaminghas become a new trend to support adaptivity in video delivery. AnHTTP streaming client needs to estimate exactly resource availabilityand resource demand. In this paper, we focus on themost importantresource which is bandwidth. A new and general formulationfor throughput estimation is presented taking into account previousvalues of instant throughput and round trip time. Besides, weintroduce for the first time the use of bitrate estimation in HTTPstreaming. The experiments show that our approach can effectivelycope with drastic changes in connection throughput and video bitrate.
An Evaluation of Bitrate Adaptation Methods for HTTP Live Streaming
Truong Cong Thang,Le, Hung T.,Pham, Anh T.,Yong Man Ro IEEE 2014 IEEE journal on selected areas in communications Vol.32 No.4
<P>HTTP streaming has become a cost-effective means for multimedia delivery nowadays. For adaptivity to networks and terminals, a provider should generate multiple representations of an original video as well as the related metadata. Recently, there have been various adaptation methods to support adaptive HTTP streaming. In this paper, we investigate typical adaptation methods in the context of live video streaming. We first discuss the trade-off among typical adaptation methods. The evaluation and comparison are then carried out not only in terms of bitrate and buffer behaviors but also in terms of the perceptual impact on end users. It is found that the perceptual impact depends not only on adaptation method but also on the content itself. We also show that the preparation of representation sets may affect the behaviors of some adaptation methods.</P>
Adaptive Video Streaming over HTTP with Dynamic Resource Estimation
Thang, Truong Cong,Le, Hung T.,Nguyen, Hoc X.,Pham, Anh T.,Kang, Jung Won,Ro, Yong Man The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
Adaptive hypertext transfer protocol (HTTP) streaming has become a new trend to support adaptivity in video delivery. An HTTP streaming client needs to estimate exactly resource availability and resource demand. In this paper, we focus on the most important resource which is bandwidth. A new and general formulation for throughput estimation is presented taking into account previous values of instant throughput and round trip time. Besides, we introduce for the first time the use of bitrate estimation in HTTP streaming. The experiments show that our approach can effectively cope with drastic changes in connection throughput and video bitrate.
Scalable Video Broadcasting with QoS Adaptation
장콩탕(Truong Cong Thang),강정원(Jung Won Kang),이경준(Kyung Jun Lee),유정주(Jeong Ju Yoo),임종수(Jong Soo Lim) 한국방송·미디어공학회 2008 한국방송공학회 학술발표대회 논문집 Vol.2008 No.-
Modern broadcasting/multicasting networks has the heterogeneous nature in terms of terminals and available bandwidth. Such heterogeneity could be coped by scalable video coding (SVC) standard developed recently. More specifically, spatial layers of an SVC bitstream can be consumed by different terminals and SNR (and temporal) scalability can be used to cope with bandwidth heterogeneity. In this work, we tackle the problem of SVC adaptation for different user groups receiving the same broadcast/multicast video, so as to provide a flexible tradeoff between the groups while also maximizing the overall quality of the users. The adaptation process to truncate an SVC bitstream is first formulated as an optimization problem. Then the problem is represented by MPEG-21 DIA description tools, which can be solved by a universal processing. The results show that MPEG-21 DIA is useful to enable automatic and interoperable adaptation in our scenario.