Method and apparatus for transcoding bitstreams of videodata

摘要

The transcoding system allows a coded bit stream (PBS) conforming to a given norm to be converted to a different data rate, by partial decoding of the video data (VID) to extract the movement information and video data type information. The video data with the second data rate is encoded via the same movement information and video data type information, using movement information prediction and interpolation, the number of prediction modi limited in dependence on video data type. Pref. the incoming and outgoing video data are each based on coded image point blocks, with the movement information and the video data type information associated with each of these blocks, or with macro blocks assembled from a number of blocks.