. ▁Two ▁standards ▁have ▁been ▁produced ▁by ▁the ▁R VC ▁working ▁group : ▁ ▁The ▁code c ▁configuration ▁representation ▁( ISO / IE C ▁ 2 3 0 0 1 - 4 ▁or ▁M PE G - B ▁pt . ▁ 4 ) ▁describes ▁the ▁format ▁with ▁which ▁an ▁R VC ▁dec oder ▁can ▁be ▁defined ▁as ▁a ▁network ▁of ▁computational ▁blocks , ▁as ▁well ▁as ▁a ▁text ual ▁language ▁for ▁the ▁definition ▁of ▁video ▁coding ▁blocks . ▁ ▁A ▁video ▁tool ▁library ▁( ISO / IE C ▁ 2 3 0 0 2 - 4 ▁or ▁M PE G - C ▁pt . ▁ 4 ) ▁that ▁standard izes ▁actors ▁needed ▁to ▁describe ▁existing ▁video ▁coding ▁standards ▁( current ly ▁M PE G - 4 ▁part ▁ 2 ▁and ▁M PE G - 4 ▁part ▁ 1 0 ). ▁ ▁Mot iv ations ▁R VC ▁was ▁motiv ated ▁by ▁the ▁following ▁observations : ▁ ▁In ▁the ▁last ▁two ▁dec ades , ▁many ▁video ▁coding ▁standards ▁( MP EG - 2 , ▁M PE G - 4 ▁A VC , ▁V P 8 , ▁etc .) ▁have ▁been ▁specified ▁to ▁meet ▁consum ers ' ▁dem ands . ▁These ▁new ▁techn ologies ▁have ▁been ▁using ▁increasing ly ▁complex ▁algorithms ▁and ▁many ▁of ▁them ▁share ▁some ▁common ▁parts ▁( a ▁discrete ▁cos ine ▁transform ▁for ▁example ). ▁Unfortunately , ▁there ▁was ▁at ▁the ▁time ▁no ▁standard ▁way ▁to ▁explo it ▁these ▁similar ities . ▁ ▁The ▁specification ▁of ▁a ▁video ▁coding ▁standard ▁was ▁previously ▁provided