MPEG-4 AVC/H.264 Based Motion Description for Fast Video Bitstream Generation
Yi Wang · Chinese Journal of Computers · 2007
Since variable block size and rate-distortion optimization techniques have been adopted in MPEG-4 AVC/H.264,motion data is computed with high intensity and the obtained data is strongly related to the target bitrate.This paper proposes a hierarchical model to describe the motion of each macroblock(MB)from coarsely to finely.Meanwhile,a pre-encoding algorithm is developed to calculate these data in advance.They can be stored as user data in a media file or a stream.The overhead of coding these motion data is very small for raw sequence or a high bitrate stream.As a result,it does not need motion estimation anymore in encoding or transcoding process.This paper also proposes a method to readily extract a specific motion from the model for efficiently coding at either a high bitrate or a low bitrate.Experimental results have shown that extracted motion can achieve similar performance as the originally optimal MPEG-4 AVC/H.264.