Patent ID: 8902314

Claim:
Method for transcoding a picture data signal that includes a video bitstream and a DVD sub-picture bitstream into a single video bitstream, the method comprising, digitally decoding said DVD sub-picture bitstream into a DVD sub-picture signal, extracting from the DVD sub-picture signal a macroblock mask containing as affected macroblocks all those macroblocks that will be affected by the DVD sub-picture, generating, only in the affected macroblocks, newly encoded video data by decoding the video bitstream into a video signal, adding the video signal and the DVD sub-picture signal into a merged signal, and re-encoding the merged signal using intra macroblock type or zero vector prediction macroblock type, and generating a single video bitstream including unaltered encoded video data from the video bitstream in macroblocks other than the affected macroblocks, and including the re-encoded merged signal in the affected macroblocks.