Media scaling in a multimedia communication system View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-10

AUTHORS

Luca Delgrossi, Christian Halstrick, Dietmar Hehmann, Ralf Guido Herrtwich, Oliver Krone, Jochen Sandvoss, Carsten Vogt

ABSTRACT

HeiTS, the Heidelberg Transport System, is a multimedia communication system for real-time delivery of digital audio and video. HeiTS operates on top of guaranteedperformance networks that apply resource reservation techniques. To make HeiTS also work with networks for which no reservation scheme can be realized (for example, Ethernet or existing internetworks), we implement an extension to HeiTS which performs media scaling at the transport level: The media encoding is modified according to the bandwidth available in the underlying networks. Both transparent and nontransparent scaling methods are examined. HeiTS lends itself to implement transparent temporal and spatial scaling of media streams. At the HeiTS interface, functions are provided which report information on the available resource bandwidth to the application so that nontransparent scaling methods may be used, too. Both a continuous and discrete scaling solution for HeiTS are presented. The continuous solution uses feedback messages to adjust the data flow. The discrete solution also exploits the multipoint network connection mechanism of HeiTS. Whereas the first method is more flexible, the second technique is better suited for multicast scenarios. The combination of resource reservation and media scaling seems to be particularly well suited to meet the varying demands of distributed multimedia applications. More... »

PAGES

172-180

References to SciGraph publications

  • 1992. Implementing HeiTS: Architecture and implementation strategy of the Heidelberg High-Speed Transport System in NETWORK AND OPERATING SYSTEM SUPPORT FOR DIGITAL AUDIO AND VIDEO
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf01210448

    DOI

    http://dx.doi.org/10.1007/bf01210448

    DIMENSIONS

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