Sliding window based FGS bandwidth fast allocation algorithm

The present invention relates to a FGS belt width rapid distributing method on basis of slide window:(1) the FGS picks up the R-D curve, the absolute error and the SAD) information of the present coding frame when in coding, and makes the frame putting to the slide window to renew the available belt width value of the window;(2) if the actual frame number is smaller than the scheduled valve value M in the slide window, and then step(1) is needed;(3) through the whole slide window, for each actual frame of not undergoing the interleave processing, and the interleave processing is held according to the SAD information, wherein the interleave sign is the illusive, and the useable belt width value is renewed;(4), according to the slide window after interleave processing and the R-D curve, the present invention uses the present useable belt width of the present window as the upper limit to renew the useable belt width value of the window, and the FGS belt width distributing method is in running;(5), the first fram