Method for modifying encoded digital video for improved channel utilization by reduction of coded B-frame data

摘要

A method for increasing channel utilization for a data channel transmitting a multiplex of a set of one or more encoded program streams, each program stream being decodeable by a corresponding decoder, each corresponding decoder including a corresponding decoder buffer, the decoder buffers having a maximum allowable size, the method comprising selecting encoded pictures to be modified, said selecting according to a criterion which includes preventing any underflow of any decoder buffer, modifying each said selected encoded picture to form a corresponding modified encoded picture, said modified encoded picture having less data than said selected encoded picture, and transmitting the corresponding modified encoded pictures through the channel in place of the selected encoded pictures.