Patent ID: 7251275
Filing Date: 2007-07-31
Classification: H04N

Abstract:
1. A method for statistical multiplexing in a dual pass encoding scheme, comprising the steps of: encoding alternate slices of anchor frames as I-slices and P-slices, respectively by employing a first pass encoding scheme in order to generate statistics for both I and P frame encoding for the same anchor frame; determining encoding complexity estimates for a plurality of frames in a look-ahead pipeline of a dual pass encoder; summing the encoding complexity estimates of selective frames in the look-ahead pipeline to determine the initial need parameter for a current frame to be encoded; and determining the bit rate for second pass encoding of said current frame, wherein: said encoding complexity estimate comprises a complexity estimate for I-frame encoding (Ci); when said current frame comprises an anchor frame, Ci equals the initial complexity estimate generated by a first pass encoding of said current frame; and when said current frame does not comprise an anchor frame, Ci equals the initial complexity estimate generated by a first pass encoding of the next anchor frame in the look-ahead pipeline.