Beijing Bytedance Network Technology Co., Ltd.

Bytedance Inc.

Qualcomm Incorporated

Lemon Inc.

China University of Mining and Technology

Lg Electronics (china) R & D Center Co., Ltd

Shenzhen University

Beijing Qiyi Century Science & Technology Co., Ltd.

Bytedance (hk) Limited

Chinese Academy of Sciences

Chinese Academy of Agricultural Sciences

Beijing Volcano Engine Technology Co., Ltd.

Agro-environmental Protection Institute, Ministry of Agriculture and Rural Affairs

Beijing Bytedance Newtork Technology Co., Ltd.

Hongbin Liu

Li Feng Zhang

Kai Zhang

Yue Wang

Jizheng Xu

Zhipin Deng

Yang Wang

Weijia Zhu

Ying Hai Chen

Na Zhang

Marta Karczewicz

Jianle Chen

Xiang Yang Li

Li Zhang

Yuwen He

Ye-Kui Wang

Hsiao Chiang Chuang

Yang Ju

Kui Fan

Xin Zhao

Jie Jia

Zhangyu Ren

Peng Liu

Siwei Ma

Jiahao Li

Chang Lu

Xiaodong Nie

Changbing Wan

Lingtao Mao

Tao Wang

Lei Wang

Heping Xie

Feng Gao

Yan Zhu

Shiqi Wang

Jianqiang Wang

Tianliang Fu

Jiadan Zhu

Junru Li

Meng Wang

Ruidong Peng

Jinxin Song

Yongming Yang

Wei-Jung Chien

Li Wang

Xianglin Wang

Geert Van Der Auwera

Joel Sole Rojals

Vijayaraghavan Thirumalai

Yong Zhu

Sungwon Lee

Jinfeng Zhang

Yating Wang

Jie Li

Xing Wu

Wenjie Li

Junting Pan

Cheng Yan

Changqing Wang

Yingping Chen

Chao Cui

Yaohua Li

Wenchi Zhang

Yuhuai Zhang

Mengjun Hui

Changxi Yang

Xiaojuan Niu

Xiaolan Li

Tang Zhou

Yao Du

Yanjun Zhang

Jianning Zhao

Lili Wang

Limei Zhai

Weiming Xiu

Bin Xi

Guilong Zhang

A method of visual media processing includes determining whether to use an affine adaptive motion vector resolution (AMVR) technique on visual media data relying on a control information related to the affine AMVR technique in a bitstream representation of the visual media data, wherein the control information is included or excluded from the bitstream representation based on a rule; and performing a conversion between the visual media data and the bitstream representation of the visual media data.

Syntax signaling in sub-block merge mode

An example method of video processing includes determining, for a conversion between a current picture of a video and a coded representation of the video, a position of a reference sample in a reference picture that is associated with the current picture based on a top-left position of a window of a picture. The picture includes at least the current picture or the reference picture, and the window is subject to a processing rule during the conversion. The method also includes performing the conversion based on the determining.

Deriving reference sample positions in video coding

Devices, systems and methods for applying intra-block copy (IBC) in video coding are described. In general, methods for integrating IBC with existing motion compensation algorithms for video encoding and decoding are described. In a representative aspect, a method for video encoding using IBC includes determining whether a current block of the current picture is to be encoded using a motion compensation algorithm, and encoding, based on the determining, the current block by selectively applying an intra-block copy to the current block. In a representative aspect, another method for video encoding using IBC includes determining whether a current block of the current picture is to be encoded using an intra-block copy, and encoding, based on the determining, the current block by selectively applying a motion compensation algorithm to the current block.

Interaction between IBC and affine

Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between applicability of a matrix based intra prediction (MIP) mode or a transform mode during the conversion, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, and where the transform mode specifies use of a transform operation for the determining the prediction block for the current video block.

Transform coding based on matrix-based intra prediction

Methods, systems and devices for video coding using sample string vectors are described. An example method of video processing includes determining, for a conversion between a video including a current block and a bitstream of the video, an availability of a block vector of one or more non-adjacent neighboring blocks of the current block for a prediction of a block vector of the current block according to a rule, and performing, based on the determining, the conversion, wherein the rule specifies a pre-defined order for checking the one or more non-adjacent neighboring blocks.

Video coding using sample string vector

Device, methods, and systems that enable the interaction of merge list construction with other tools and methods in video coding are described. An exemplary method for video processing includes determining, based on a first threshold, a maximum number of history-based motion vector prediction (HMVP) candidates to be checked in a table, making a decision regarding a selective checking of a number of the HMVP candidates in an order, the number of the HMVP candidates checked not exceeding the maximum number of HMVP candidates, constructing, based on the decision, a motion candidates list, and performing, based on the motion candidates list, a conversion between a current block and a bitstream representation of the current block.

Interaction between merge list construction and other tools

Restrictions on motion vector difference (MVD) are disclosed. In one example method of video processing, performing a conversion between a first block of video and a bitstream representation of the first block based on a constrained signaled MVD component associated with the first block, wherein value of the signaled motion vector difference component is constrained in a predetermined range.

Restrictions on motion vector difference

Devices, systems and methods for video processing are described. In a representative aspect, there is disclosed a method for video processing, including: determining, for a current video block, whether a first partition mode is applicable to the current video block in responsive to at least one condition, wherein the current video block is split into M sub-blocks in the first partition mode, and M>4; and performing a conversion for the current video block based on the determination.

Condition dependent video block partition

The present disclosure relates to interaction between intra block copy mode and inter prediction tools. A method for video processing includes determining that an intra block copy (IBC) mode is applied to a current video block of a video. In the IBC mode, at least one reference picture used by the current video block is a current picture where the current video block is located. The method also includes making a decision regarding a disabling of a specific coding mode for the current block. The specific coding mode uses a motion vector and a non-current picture to derive a prediction of a video block. The method further includes performing, based on the decision, a conversion between the current video block and the bitstream representation.

Interaction between Intra Block Copy mode and inter prediction tools

Devices, systems and methods related to digital video coding, and specifically, to signaling of slice types in video picture headers are described. One example method of video processing includes performing a conversion between a video including one or more video pictures including one or more slices and a bitstream of the video, wherein the bitstream conforms to a format rule, and wherein the format rule specifies that for a video picture of the one or more video pictures having all slices coded as I slices, P slice and B slice related syntax elements are omitted from a picture header for the video picture.

Signaling of slice types in video pictures headers

A method of visual media processing includes determining a size of a buffer to store reference samples for prediction in an intra block copy mode; and performing a conversion between a current video block of visual media data and a bitstream of the current video block, using the reference samples stored in the buffer, wherein the conversion is performed in the intra block copy mode which is based on motion information related to a reconstructed block located in same video region with the current video block without referring to a reference picture.

Buffer resetting for intra block copy in video coding

A video processing method includes determining, for a conversion between a block of a video and a bitstream representation of the video, that a secondary transform with a reduced dimension dimension (e.g., an inverse low frequency non-separable transform) is applicable to a single sub-block of the block in case a dimension of the block satisfies a condition. The secondary transform is performed between a forward primary transform and a quantization step or between a de-quantization step and an inverse primary transform. The reduced dimension is reduced from a dimension of the block. The method also includes performing the conversion based on the determining.

Use of secondary transform in coded video

One example method of video processing includes implementing, by a processor, a decoder-side motion vector derivation (DMVD) scheme for motion vector refinement during a conversion between a current video block and a bitstream representation of the current video block by deriving parameters based on a deriving rule. The conversion may include compressing the current video block into the bitstream representation or uncompressing the bitstream representation into pixel values of the current video block.

Decoder side motion derivation based on processing parameters

The disclosure relates to improvement on HMVP table. A method for processing video includes: maintaining, during a conversion between a current block of visual media data and a corresponding coded representation of the visual media data, a table storing history based motion vector prediction (HMVP) candidates which include motion information based on previously coded blocks; performing the conversion of the current block at least based on the table, wherein the table is of a HMVP table size which depends on one or more motion candidate lists, and the HMVP table size is a maximum number of candidates stored in the table.

HMVP table improvements

A method of video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video using a coding tool that accesses samples outside of the current block, that neighboring samples used for the conversion are unavailable. Samples that are located across a boundary of a video unit of the video are considered as unavailable samples. The method also includes performing, based on the determining, the conversion by padding samples in place of the neighboring samples that are unavailable. The padding samples are determined using samples that are restricted to be within a current processing unit associated with the current block.

Padding process at unavailable sample locations in adaptive loop filtering

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Beijing, China

Hongbin Liu