HELP! * GREY=local LOCAL HTML version of Foils prepared July 28,1995

Foil 6 VBR(Variable Bit Rate) to
CBR(Constant Bit Rate) III

From Second Part of HPDC95 Video Server Presentation HPDC95 Pentagon City -- August 1,1995. by Miguel del Rosario * See also color IMAGE
Key issue in VOD : Network Traffic
Central debate in CBR vs. VBR :
  • Is there really a performance gain in VBR?
CBR Encoding:
  • Constant bit rate, variable picture quality
  • Advantage: fixed bandwidth requirement
  • Disadvantage: picture quality degradation
VBR Encoding:
  • Variable bit rate, constant picture quality
  • Advantage: constant picture quality
  • Disadvantage: difficult to allocate network bandwidth

Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

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