Adaptive filtering of MPEG system streams in IP networks

Abstract

Congestion and large differences in available link bandwidth create challenges for the design of applications that want to deliver high quality video over the Internet. We present an efficient adaptive filter for MPEG System streams that can be placed in the network (e.g., as an active service). This filter adjusts the bandwidth demands of an MPEG System stream to the available bandwidth without transcoding while maintaining synchronization between the streams embedded in the MPEG System. The filter is network-friendly: it is fair with respect to other (TCP) competing streams and it avoids generating bursty traffic. This paper presents the system architecture and an evaluation of our implementation in three different operating environments: a networking testbed in a laboratory environment, a homeuser scenario (DSL line with 640 Kbit/s), and a wide area network covering the Atlantic (server in Europe, client in the US). Moreover we examine the networkfriendliness of the adaptation protocol and the relationship between the quality of the received continuous media and the protocol's aggressiveness. Our architecture is based on efficient MPEG System filtering to achieve high-quality video over besteffort networks.

Adaptive video streaming for embedded devices

“…Reconfiguration is not taken into account. This approach has been followed in many application-level proxy architectures such as [10][21] [11][17] [13]. An intermediate proxy is used to perform additional treatments on multimedia streams such as data transformations, protocol conversions, data transcoding, etc.…”

“…A site on which such an adaptation process is deployed is generally called Proxy. An adaptation process may consist in filtering multimedia streams [10], changing their transmission protocol [11], transcoding content [1] or applying spatial and temporal transformations [13] [21]. The main benefit of network-based adaptation is its non-intrusivity with respect to legacy applications, while benefiting from the processing power available in the data-path.…”

Um framework para configuração e gerenciamento de recursos e componentes em sistemas multimidia distribuidos abertos

“…• &RQILJXUDomR HVWiWLFD VHP UHFRQILJXUDomR Exemplos típicos desta abordagem definem elementos intermediadores dos tipos conversores e transcodificadores de fluxos multimídia [53] [54] [55] [56]. Embora estas propostas tenham tratado questões de heterogeneidade, elas empregam uma visão monolítica para projetos de aplicações.…”