Method and apparatus for h.264 to mpeg-2 video transcoding
AssigneeLSI Corporation
InventorsGuy Cote, Lowell L. Winger
Life of this patent
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Abstract
A method for transcoding from an H.264 format to an MPEG-2 format is disclosed. The method generally comprises the steps of (A) decoding an input video stream in the H.264 format to generate a picture having a plurality of macroblock pairs that used an H.264 macroblock adaptive field/frame coding; (B) determining a mode indicator for each of the macroblock pairs; and (C) coding the macroblock pairs into an output video stream in the MPEG-2 format using one of (i) an MPEG-2 field mode coding and (ii) an MPEG-2 frame mode coding as determined from the mode indicators.
Claims13
A method for transcoding from an H.264 format to an MPEG-2 format, comprising the steps of:
- (A) decoding an input video stream in said H.264 format to generate a picture having a plurality of macroblocks with a plurality of H.264 motion vectors pointing to at least three reference frames;
- (B) scaling said H.264 motion vectors to generate a plurality of seed motion vectors that point to at most two reference frames;
- and
- (C) coding said macroblocks into an output video stream in said MPEG-2 format based on said seed motion vectors.
A method for transcoding from an H.264 format to an MPEG-2 format, comprising the steps of:
- (A) decoding an input video stream in said H.264 format to generate a picture;
- (B) determining that said picture had an H.264 picture adaptive field/frame coding in said input video stream;
- and
- (C) coding said picture into an output video stream in said MPEG-2 format using an MPEG-2 frame mode coding.
Dependencies are inferred from the claim text.