Multimedia Systems

, Volume 2, Issue 4, pp 172–180 | Cite as

Media scaling in a multimedia communication system

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


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.

Key words

Media scaling Multimedia networks Transport systems 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Bux W, Grillo D (1984) Flow control in local-area networks of interconnected token rings. IBM Research Report No. 48243Google Scholar
  2. 2.
    Clark DD, Shenker S, Zhang L (1992) Supporting real-time applications in an integrated services packet netwock: architecture and mechanism. ACM SIGCOMM 92, BaltimoreGoogle Scholar
  3. 3.
    Delgrossi L, Halstrick C, Herrtwich RG, Stüttgen H (1992) HeiTP — a transport protocol for ST-II. IEEE Globecom 92, OrlandoGoogle Scholar
  4. 4.
    Gonzales C, Viscito E (1992) Flexibly scalable digital cideo coding. Research Report, IBM T.J. Watson Research CenterGoogle Scholar
  5. 5.
    Gonzales CA, Viscito E, McCarthy T (1991) Scalable motioncompensated transform coding of motion video: a proposal for the ISO/MPEG-2 standard. Research Report, IBM T.J. Watson Research CenterGoogle Scholar
  6. 6.
    Hehmann D, Herrtwich RG, Steinmetz R (1991) Creating HeiTS: objectives of the Heidelberg high-speed transport system. GI-Jahrestagung, DarmstadtGoogle Scholar
  7. 7.
    Hehmann D, Herrtwich RG, Schulz W, Schutt T, Steinmetz R (1992) Implementing HeiTS: architecture and implementation strategy of the Heidelberg high-speed transport system. Second International Workshop on Network and Operating System Support for Digital Audio and Video, Lecture Notes in Computer Science 614. Springer Berlin HeidelbergGoogle Scholar
  8. 8.
    Jacobson V (1988) Congestion avoidance and control. ACM SIGCOMM 88Google Scholar
  9. 9.
    LeGall D (1991) MPEG: a video compression standard for multimedia applications. Commun ACM 34(4):46–58Google Scholar
  10. 10.
    Luther AC (1992) Digital video in the PC environment. McGraw-Hill, New YorkGoogle Scholar
  11. 11.
    Nagarajan R, Vogt C (1992) Guaranteed-performance transport of multimedia traffic over the token ring. IBM Technical Report No. 43.9201Google Scholar
  12. 12.
    P. Pancha, El Zarki M (1992) Prioritized transmission of variable bit rate MPEG video. IEEE Globecom 92, OrlandoGoogle Scholar
  13. 13.
    Steinmetz R (1993) Kompressionsverfahren in der Übersicht (in press)Google Scholar
  14. 14.
    Tokuda H, Tobe A, Chou STC, Moura JMF (1992) Continous media communication with dynamic QOS control using ARTS with an FDDI network. ACM SIGCOMM 92, BaltimoreGoogle Scholar
  15. 15.
    Topolcic C (ed) (1990) Experimental Internet stream srotocol, Version 2 (ST-II). RFC 1190, OctoberGoogle Scholar
  16. 16.
    Uppaluru P (1992) Networking digital video. 37th IEEE COMPCONGoogle Scholar
  17. 17.
    Video codec for audiovisual services at px64 kbit/s (1990) Recommendation H.261, CCITT GenevaGoogle Scholar
  18. 18.
    Viscito E, Gonzales C (1991) The MPEG-1 video compression standard. Research Report, IBM T.J. Watson Research CenterGoogle Scholar
  19. 19.
    Vogt C, Herrtwich RG, Nagarajan R (1992) HeiRAT: the Heidelberg resource administration technique, design philosophy and goals. Kommunikation in verteilten Systemen, Munich (1993) (also published as IBM Tech. Rep. No. 43.9213)Google Scholar
  20. 20.
    Wallace GK (1991) The JPEG still picture compression standard. Commun ACM 34(4): 30–44Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Luca Delgrossi
    • 1
  • Christian Halstrick
    • 1
  • Dietmar Hehmann
    • 1
  • Ralf Guido Herrtwich
    • 1
  • Oliver Krone
    • 1
  • Jochen Sandvoss
    • 1
  • Carsten Vogt
    • 1
  1. 1.Distributed Multimedia SolutionsIBM European Networking CenterHeidelbergGermany

Personalised recommendations