A hevc fast code rate transcoding method

A transcoding and fast technology, applied in the field of code rate transcoding, can solve the problems of long time required for transcoding, high computational complexity of the transcoder, difficulty in meeting the requirements of real-time transcoding, etc.

Active Publication Date: 2017-11-21
CENT SOUTH UNIV
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Problems solved by technology

[0011] Considering the above three aspects, the transcoding efficiency of the compressed domain transcoder is higher than that of the pixel domain transcoder, but considering that the current research on DCT domain motion compensation (DCT-MC) is not mature, it may give The coder brings unexpected computational complexity, and the theory also relies on linearity assumptions
However, the pixel-domain transcoding framework has an obvious disadvantage, that is, the computational complexity of the transcoder is relatively large, and the time required for transcoding is relatively long. It is difficult to meet the requirements of real-time transcoding, and the resources consumed are relatively large. Equipment is more expensive

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  • A hevc fast code rate transcoding method
  • A hevc fast code rate transcoding method
  • A hevc fast code rate transcoding method

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0077] In this embodiment, a pixel-domain transcoder is used as the basic framework for code rate transcoding, specifically as follows figure 1 shown. The transcoding framework first decodes the original high-bit-rate video stream through a decoder to obtain a reconstructed video sequence (YUV), then takes the reconstructed video sequence as the input of the encoder, and encodes it into a target bit-rate video stream through the encoder output, during which the encoding information extracted from the decoder can be utilized to speed up the transcoding speed of the transcoder.

[0078] When HEVC performs inter-frame mode selection, it needs to traverse all coding units CUs in all depths (0~3), and for each coding unit, it needs to calculate the rate-distortion cost of 9 PU modes, and obtain the minimum rate-distortion cost The CU depth and PU mode of are ...

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Abstract

The invention discloses an HEVC rapid code rate transcoding method. The method comprises the following steps of: adopting a pixel domain transcoder as a basic framework for code rate transcoding; firstly decoding an original high-code rate video stream through a decoder to obtain a reconstructed video sequence; taking the reconstructed video sequence as input of an coder and coding the reconstructed video sequence into a target code rate video stream to output; and in the process, improving a transcoding speed of the transcoder through a rapid CU depth prediction algorithm and a rapid PU mode selection algorithm by utilizing coding information extracted from the decoder. According to the rapid code rate transcoding method, the transcoding speed is improved through the rapid CU depth prediction algorithm and the rapid PU mode selection algorithm, and the video quality is ensured at the same time.

Description

technical field [0001] The invention relates to the field of video coding and decoding, in particular to a code rate transcoding method. Background technique [0002] In the past ten years, H.264 / MPEG-4AVC has been widely used in various applications. However, with the development and popularization of high-definition and ultra-high-definition video, the requirements for video compression efficiency are further improved. Due to its limitations, H.264 cannot continue to meet this demand, thus bringing new challenges to video coding technology. A high-efficiency coding——HEVC was proposed under this background. Its goal is to achieve the goal of twice the compression efficiency of H.264 on the basis of ensuring video quality by integrating the latest technologies and algorithms. To meet people's demand for high-definition and ultra-high-definition video. [0003] In terms of coding principles and basic framework, HEVC follows the classic block-based hybrid video coding method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/176H04N19/40H04N19/70
CPCH04N19/176H04N19/40H04N19/70
Inventor 张昊王洁李林格
Owner CENT SOUTH UNIV
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