@TechReport{Schojer2004, author = {Schojer, Peter and Böszörmenyi, Laszlo and Hellwagner, Hermann}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {QBIX-G: A Quality Based Intelligent proXy Gateway}, year = {2004}, address = {Klagenfurt, Austria}, month = {jan}, abstract = {Due to the increasing availability of audio/visual data on the Internet, proxy caching is gaining on importance as a performance factor. This increase is accompanied by a diversification in the end terminals, which calls for media gateways and filters. An adaptive proxy is presented which performs (1) caching, (2) filtering and (3) media gateway functionality in one. The proxy can perform media adaptation -- using transcoding -- on its own. A cost model is presented which incorporates user requirements, terminal capabilities and video variations in one formula. Based on this model, the proxy acts as a general broker of different user requirements and of different video variations. This is a first step towards "What You Need is What You Get" (WYNIWYG) video services, which deliver videos to users in exactly that quality what they need and what they want to pay for. The MPEG-7 and MPEG-21 standards enables this in an interoperable way. A detailed evaluation based on a series of measurements is provided.}, language = {EN}, pages = {24} }