The correlation of adjacent slices bitrates in frequency domain can effectively reflect the activity of the motion pictures.

Based on the local minimal value of correlation of slice bitrate samples, it shifted the slice between different sources according to position of the minimal value.

For independent transcoding of MPEG-2 VBR video,frame shift and algorithm based on correlation of slice are proposed;For joint transcoding, we introduce the joint rate control strategy based on the rate distortion, which uses the concept of superframe.

Firstly the original image is divided into several macro blocks in the light of certain size,and macro block within each row are permuted.

Motion vector of the moving object is obtained by one designed filter, which mainly processes motion vector of macroblockes of the moving object s boundary.

The function encode_one_macroblock() is the center in the implementation of the encoding algorithm.

This paper proposes a hierarchical model to describe the motion of each macroblock(MB)from coarsely to finely.

The improved APIB with the PSNR weighted to calculate macro-block complexity.

Base on the character that there is less temporal correlation between frames where scene change oc-curs,according to different macro-block prediction mode in the whole frame,the proposed algorithms obtain candidates of scene change frames.

The proposed method can detect scene boundaries through using various macroblock type of B-frame and P-frame in MPEG video flow in order to realize accurate scene change positioning.

In this thesis,an adaptive macroblock encoding algorithm based on macroblock type spatial domain predic-tion is proposed.

The proposed method determines the motion activity and visual content change of the MPEG compressed video by using the luminance DCT DC value、macroblock type and motion vector.

Based on the method projected in literature ,the authors introduces the FPGA macro block placement.