H.265/HEVC transcoding method and transcoder based on H.264/AVC macro block structure and texture

Abstract

The invention relates to an H.264 / AVC to H.265 / HEVC transcoding method and transcoder based on an H.264 / AVC macro block structure and texture. The method includes the steps of extracting inter-frame macro block division mode information in a code stream of H.264 / AVC standard codes, combining every four 16*16 H.264 / AVC macro blocks to form one 32*32 large macro block, judging whether four division modes of the four 16*16 H.264 / AVC macro blocks in each 32*32 large macro block are all 16*16 division modes or not, if not, mapping the macro block division modes to an H.265 / HEVC coding mode in a direct mapping mode, if yes, judging other modes of each 32*32 large macro block through a mode judging method based on texture, enabling the division mode selected through judgment to serve as the macro block division mode for H.265 / HEVC codes, and coding the code stream of the H.265 / HEVC codes according to the macro block division modes of the H.265 / HEVC codes. By means of the H.264 / AVC to H.265 / HEVC transcoding method and transcoder based on the H.264 / AVC macro block structure and texture, by selecting and using the macro block division mode information in the code stream of H.264 / AVC codes, the transcoding speed is increased, and the coding effect is improved.

Description

technical field [0001] The present invention relates to the transcoding of video data, and specifically refers to a H.265 / HEVC transcoding method and a transcoder based on the H.264 / AVC macroblock structure and texture, which are used to transcode the H.264 / AVC standard video The data is transcoded into H.265 / HEVC standard video data. Background technique [0002] The popularity of high-definition video and the emergence of ultra-high-definition video have vigorously promoted the development of video codec technology. In 2013, two major international organizations, MPEG and ITU, officially released the H.265 / HEVC next-generation digital video codec standard to adapt to network Transmission and development of high-quality video applications. H.265 / HEVC is a further extension and expansion on the basis of H.264 / AVC technology. Since the draft collection began in 2010, it has been jointly developed by hundreds of experts from all over the world. It was officially announced to...

AI Technical Summary

Problems solved by technology

When encoding H.265 / HEVC, it is necessary to search for the division mode of each prediction unit first, and use the rate-distortion optimization function to calculate the encoding cost. Finally, compare the calculation results and select the mode with the smallest cost as the division mode of the prediction unit for inter-frame coding. Therefore, in the existing transcoding process, since the effective information in the H.264 / AVC code stream is not used to speed up the H.265 / HEVC encoding process, the transcoding process is computationally intensive and the transcoding efficiency is limited

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