Optimum adaptation trajectories for streamed multimedia

Nicola Cranley, Philip Perry, Liam Murphy

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Most adaptive delivery mechanisms for streaming multimedia content do not explicitly consider user-perceived quality when making adaptations. We propose that an optimal adaptation trajectory through the set of possible encodings exists and that it indicates how to adapt encoding quality in response to changes in network conditions to maximize user-perceived quality. Such an optimum adaptation trajectory can be used with any transmission adaptation policy. We describe the subjective tests we carried out to find such trajectories for a number of different MPEG-4 video clips and indicate how this knowledge could be used in the operation of a practical system.

Original languageEnglish
Pages (from-to)392-401
Number of pages10
JournalMultimedia Systems
Issue number5
Publication statusPublished (in print/issue) - 1 Aug 2005


  • Adaptive multimedia transmission
  • Perceptual video quality
  • Subjective testing
  • Video encoding


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