[Mp4-tech] Explenation behind various algorithms in MPEG4

[aryan sabharwal]

Hi 
  In 14496-2, i could find only how various algorithms are implemented
  It would be of great help to me if anybody can point me to the resources which explains why its being done rather than how its being doing
  For example in AC/DC prediction it says
  if ( |FA[0][0] – FB[0][0]| < |FB[0][0] – FC[0][0]|)
                 predict from block C
  else
                 predict from block A
  I want to know the explations behind why predict from C or from A
  Do we have any resources in mpif or mpegorg which explains things like this
  Thanks in advance
  Aryan
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