Optimization And Implementation Of H.264 Video Encoder On DM642

H.264/AVC, as the latest video coding standard, is proposed by the ITU-T Video Coding Experts Group and the ISO/IEC Moving Picture Experts Group. For the enhancement of the coding efficiencies, the new standard adopts new tools as followed: multiple reference pictures, variable block-size with seven block sizes in motion prediction, quarter-pixel accuracy for motion vector, short word-length integer transform, context-adaptive entropy coding and loop filter deblocking.Firstly, the main function modules of H.264/AVC is elaborated and its new techniques being adopted. It is expounded that the application of intra prediction, mufti-block inter prediction, 1/4 and 1/8 fractional pixel motion estimation, multiple reference frames, integer transform, CABAC and deblock filter, etc.Secondly, some search algorithms departed are elaborated. And hybrid unsymmetrical-cross multi-hexagon-grid search algorithm is proposed. Motion estimation is one of the most important parts of motion compensation/DCT based hybrid video coding standards which lead to high compression ratio by efficiently reducing temporal redundancy between adjacent frames of video sequence.In the last, we discuss how to execute the source program more efficient in DSPchip. We use mixed programming of c and assembly language and merge their merits to realize higher efficiency and shorter execution time.