Method and apparatus for H.264 to MPEG-2 video transcoding
AssigneeLSI Corporation
InventorsGuy Cote, Lowell L. Winger
Life of this patent
Estimating the term…
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.
Claims16
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 whether said picture had an H.264 picture adaptive field/frame coding in said input video stream;
- (C) adjusting an MPEG-2 group of pictures to utilize a least number of lowest priority frames among a plurality of MPEG-2 reference frames;
- and
- (D) coding said picture into an output video stream in said MPEG-2 format using an MPEG-2 frame mode coding in response to concluding that said picture has said H.264 picture adaptive field/frame coding.
An apparatus comprising:
- a circuit configured to (i) decode an input video stream in an H.264 format to generate a picture, (ii) determine whether said picture had an H.264 picture adaptive field/frame coding in said input video stream, (iii) adjust an MPEG-2 group of pictures to utilize a least number of lowest priority frames among a plurality of MPEG-2 reference frames and (iv) code said picture into an output video stream in an MPEG-2 format using an MPEG-2 frame mode coding in response to concluding that said picture has said H.264 picture adaptive field/frame coding.
Dependencies are inferred from the claim text.