Patent ID: 9131233
Filing Date: 2015-09-08
Classification: H04N

Abstract:
1. A method for compressing a video stream, comprising the steps of: (A) encoding a picture in a group of pictures (GOP) structure of said video stream as a first level one inter picture, wherein said first level one inter picture (a) occurs temporally (i) after a first intra picture of said GOP structure and (ii) before a second intra picture of said GOP structure and (b) uses only said first intra picture of said GOP structure as a single forwards reference; (B) encoding another picture in said GOP structure of said video stream as a second level one inter picture, wherein said second level one inter picture (a) occurs temporally (i) after said first level one inter picture and (ii) before said second intra picture and (b) uses only (i) said first level one inter picture and (ii) said second intra picture as references; and (C) encoding another picture in said GOP structure of said video stream as a first level two inter picture, wherein said first level two inter picture (a) occurs temporally after said first intra picture of said GOP structure and (ii) before said first level one inter picture, (b) uses (i) said first intra picture of said GOP structure and (ii) said first level one inter picture as references, and (c) said first level two inter picture is encoded before said second level one inter picture, wherein at least one level one inter picture uses forward prediction only, one or more level one inter pictures encoded subsequently use both forward and backward prediction, and one or more uncoded pictures in said GOP structure including said first intra picture are no longer stored in memory when said second intra picture is being encoded.