Parallel rate control for digital video encoder with multi-processor architecture and picture-based look-ahead window

Abstract From the Canadian patent

A method of operating a multi-processor video encoder (Fig. 2) by determining a target size corresponding to a preferred number of bits to be used when creating an encoded version of a picture in a group of sequential pictures making up a video sequence (See Fig. 2 item 16). The method includes the , steps of calculating a first degree of fullness of a coded picture buffer at a first time (See Fig. 2, item 8), operating on the first degree of fullness to return an estimated second degree of fullness of the coded picture buffer at a second time (See Fig. 2, item 12), and operating on the second degree of fullness to return an initial target sized for the picture (See Fig. 2 item , …