RV9DecoderExternalSpecificationv159 External Specification Video and Audio Technologies Codec Group RealNetworks, Inc January 26, 2002 Version 1.5 Summary This document is the draft specification of RealVideo9 Codec. RealVideo9 achieves new levels of compression performance at low as well as high data rates. The improvements are due in part to 1/4 pixel interpolation for motion estimation, the addition of 16x8,8x16 pixel motion compensated blocks to the 8x8 and 16x16 blocks, medium complexity motion estimation technique with better RD characteristics, 16x16 double transforms, better in-loop filter, efficient coding of 4x4 intra prediction modes, run length coding of MB -Types, and more efficient variable length coding by symbol manipulati on and adaptive coding. The algorithm also benefits from black level filter, and no……