Multimedia data processing elements for digital TV and multimedia services in home server platform

2003 ◽  
Vol 49 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Changseok Bae ◽  
Jinwook Seok ◽  
Yoonsik Choe ◽  
Jeunwoo Lee
2019 ◽  
Vol 7 (1) ◽  
pp. 250-258 ◽  
Author(s):  
Meikang Qiu ◽  
Wenyun Dai ◽  
Athanasios V. Vasilakos

Author(s):  
Maarten Wijnants ◽  
Wim Lamotte ◽  
Bart De Vleeschauwer ◽  
Filip De Turck ◽  
Bart Dhoedt ◽  
...  

Accessing multimedia services via fixed and wireless networks has become common practice. These services are typically much more sensitive to packet loss, delay and/or congestion than traditional services. In particular, multimedia data is often time critical and, as a result, network issues are not well tolerated and significantly deteriorate the user’s Quality of Experience (QoE). Therefore, the authors propose a QoE optimization platform that is able to mitigate problems that might occur at any location in the delivery path from service provider to customer. More specifically, the distributed architecture supports overlay routing to circumvent erratic parts of the network core. In addition, it comprises proxy components that realize last mile optimization through automatic bandwidth management and the application of processing on multimedia flows. This paper introduces a trans-coding service for this proxy component which enables the transformation of H.264/AVC video flows to an arbitrary bitrate. Through representative experimental results, the authors illustrate how this addition enhances the QoE optimization capabilities of the proposed platform by allowing the proxy component to compute more flexible and effective bandwidth distributions.


Author(s):  
A. Alexiou

As communications technology is being developed, users’ demand for multimedia services raises. Meanwhile, the Internet has enjoyed tremendous growth in recent years. Consequently, there is a great interest in using the IP-based networks to provide multimedia services. One of the most important areas in which the issues are being debated is the development of standards for the universal mobile telecommunications system (UMTS). UMTS constitutes the third generation of cellular wireless networks which aims to provide high-speed data access along with real-time voice calls. Wireless data is one of the major boosters of wireless communications and one of the main motivations of the next-generation standards. Bandwidth is a valuable and limited resource for UMTS and every wireless network in general. Therefore, it is of extreme importance to exploit this resource in the most efficient way. Consequently, when a user experiences a streaming video, there should be enough bandwidth available at any time for any other application that the mobile user might need. In addition, when two different applications run together, the network should guarantee that there is no possibility for any of the above-mentioned applications to prevail against the other by taking all the available channel bandwidth. Since Internet applications adopt mainly TCP as the transport protocol, while streaming applications mainly use RTP, the network should guarantee that RTP does not prevail against the TCP traffic. This means that there should be enough bandwidth available in the wireless channel for the Internet applications to run properly.


2019 ◽  
Vol 79 (15-16) ◽  
pp. 9711-9733 ◽  
Author(s):  
Geetanjali Rathee ◽  
Ashutosh Sharma ◽  
Hemraj Saini ◽  
Rajiv Kumar ◽  
Razi Iqbal

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