Patent ID: 8428118

Claim:
A system for transcoding an input first video format including one of H.261/MPEG-1/H.263/MPEG-2/MPEG-4 to a H.264 video format, comprising: a decoder capable of decoding the first video format including the one of H.261/MPEG-1/H.263/MPEG-2/MPEG-4 and identifying certain data in the input first video format that can be re-used in the H.264 video format; a re-encoder capable of producing an output stream conforming to the H.264 video format with a mapping module for mapping said certain identified data from said first video format to corresponding semantic equivalents allowed by said H.264 video format; and a scaling module inserted between said decoder and said re-encoder to scale the output of said decoder and provide it as input to said re-encoder, wherein said mapping module is further configured to arrive at a suitable set of motion compensation partitions in said H.264 video format by suitably mapping said certain identified data from said first video format to the corresponding semantic equivalents allowed by said H.264 video format subject to a downscaling ratio of 2:1, 4:3 or 3:2 in a horizontal direction and without scaling in a vertical direction.