Patent ID: 8045618

Claim:
A method for transcoding from an MPEG-2 format to a VC-1 format, comprising the steps of: (A) decoding an input video stream in said MPEG-2 format to generate a picture; (B) determining a first indicator of said picture; (C) determining a second indicator of a partition in a given one of a plurality of macroblocks in said picture; (D) determining a third indicator of a magnitude of at least one of an MPEG-2 DC coded coefficient and an MPEG-2 AC coded coefficient of a given block corresponding to said picture; and (E) coding said picture into an output video stream in said VC-1 format using said second indicator to code said given macroblock, said third indicator to code said given block and one of (i) a VC-1 field mode coding and (ii) a VC-1 frame mode coding as determined from said first indicator, wherein said magnitude of said MPEG-2 DC coded coefficient indicates one of (a) a VC-1 8×8 transform, (b) a VC-1 8×4 transform, (c) a VC-1 4×8 transform and (d) a VC-1 4×4 transform in said coding of said given block in said output video stream.