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Fast code rate transcoding method and system based on HEVC-SCC

A technology of HEVC-SCC and code rate, which is applied in the field of fast code rate transcoding algorithm, can solve problems such as inapplicable screen content video transcoding, and achieve the effect of speeding up transcoding and ensuring quality

Active Publication Date: 2017-08-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fast code rate transcoding method based on HEVC-SCC to solve the existing technical problem that the existing transcoding method is not suitable for screen content video transcoding

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  • Fast code rate transcoding method and system based on HEVC-SCC

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Embodiment 1

[0026] Code rate transcoding can be divided into CBR (constant bitrate, fixed code rate) transcoding and VBR (variable bitrate, variable code rate). CBR transcoding refers to converting a fixed code rate (R i ) input video stream is transcoded into another fixed bit rate (R o ) of the target video stream output. Among them, R i and R o They are all set in advance. To make the encoder output the video stream with the target bit rate, the bit rate control switch needs to be turned on in the encoder. VBR transcoding is to achieve code rate transcoding by changing the quantization parameter QP, and does not need to enable code rate control. When the QP is small, the bit rate of the output video stream is high, and when the QP is large, the bit rate of the output video stream is small. Therefore, when doing VBR transcoding, usually the QP of the input video stream i To be less than the QP of the output video stream o , the approximate range of the code rate can be controlled...

Embodiment 2

[0097] In order to verify the correctness and effectiveness of the fast code rate transcoding algorithm proposed by the present invention, the present invention builds the following structure based on HM-16.2+SCM-3.0 figure 1 The pixel domain spatial resolution transcoder is shown, and the fast code rate transcoding algorithm is implemented based on visual studio 2013 on the transcoder. Finally, in the process of collecting the data of the experimental results, considering that there are many tables of unstable factors in the laptop, in order to ensure the authenticity and reliability of the experimental results, all experiments are compiled and executed on the high-performance computing platform. The platform adopts a hybrid cluster (Cluster) architecture, and its computing network uses Infinband high-speed switches, which can effectively ensure the stability and reliability of the experimental results. Therefore, all the experimental data of the present invention are obtaine...

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Abstract

The invention discloses a fast code rate transcoding method and system based on HEVC-SCC. The method comprises the following steps: establishing an HEVC-SCC code rate transcoding framework, obtaining the depth of a current encoding unit and a corresponding depth during encoding, and counting mode information of adjacent encoded units of the current encoding unit and the mode information of adjacent decoding units of a corresponding decoding unit during decoding; recording the number of IntraBC modes, the number of Normal Intra modes and the depths of the adjacent encoded units in the modes of the adjacent encoded units of the current encoding unit, and recording the number of IntraBC modes and the number of Normal Intra modes in the modes of the corresponding adjacent decoding units during the decoding of the current encoding unit; calculating the average depth of the adjacent encoded units of the current encoding unit and the probability of the IntraBC modes in the corresponding adjacent decoding units during the decoding; and determining whether to skip the IntraBC modes and / or the Normal Intra modes according to the above parameter information. By adoption of the fast code rate transcoding method and system disclosed by the invention, the transcoding speed is greatly accelerated while the quality of video images is guaranteed.

Description

technical field [0001] The present invention relates to the field of video codec, in particular to HEVC-SCC-based fast rate transcoding algorithm. Background technique [0002] In the HEVC coding standard, in order to improve the compression ratio, an input image is first divided into image blocks of a predefined size, referred to as Coding Tree Units (CTUs). Each CTU can be composed of several coding units (CodingUnit, CU). There are 8×8, 16×16, 32×32, 64×64 luma samples and corresponding chrominance samples in CU. The CU can also be decomposed into smaller prediction units (Prediction Unit, PU) and transformation units (Transform Unit, TU), so that encoding, prediction and transformation can be better processed; the direction of intra mode selection is determined by the H.264 / AVC 9 modes expanded to 35. According to statistics, HEVC mode selection takes 60-70% of the entire encoding time. At the same time, HEVC also introduces Advanced Motion Vector Prediction (Advance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/146H04N19/159H04N19/169H04N19/70
CPCH04N19/146H04N19/159H04N19/169H04N19/70
Inventor 张昊张恋
Owner CENT SOUTH UNIV