H.264 downsizing transcoding method based on texture and motion characteristics

The invention provides an H.264 downsizing transcoding method based on texture and motion characteristics, and belongs to the technical field of computer digital video transcoding. The invention specifically comprises the following steps: (1) acquiring the coding information input into the H.264 code stream; wherein, the coding information includes an inter-frame coding mode, motion vectors and discrete cosine transformation coefficients; (2) dividing the motion area and the background area according to the image texture characteristics by means of the motion edge detection; (3) adopting the corresponding inter-frame mode according to the motion characteristics of the macro-blocks located in different areas, particularly, reconstructing the motion vectors by the adaptive motion vector re-sampling method or the align-to-worst weighting method according to the motion difference of the macro-blocks located in the motion area, reconstructing the motion vectors of the macro-blocks located in the background area by the align-to-average weighting method, and carrying out the motion search of the macro-blocks located on the edge of the motion object and the internal macro-blocks. Compared with other methods, the method of the invention can not only guarantee the quality of the transcoded video, but also effectively solve the problem of the downsizing transcoding real-time performance.