Bytedance Inc.

Beijing Bytedance Network Technology Co., Ltd.

Qualcomm Incorporated

Tencent Technology (Shenzhen) Company Limited

Lemon Inc.

Other

Oatey Company

Zimmer Gmbh

Huawei Technologies Co., Limited

Nanjing Tech University

Hon Hai Precision Industry Co., Ltd.

Hong-Fu Jin Precision Industry (Shenzhen) Co., Ltd.

Byd Company Limited

Huawei Device Co., Ltd.

The Methodist Hospital

Kai Zhang

Li Feng Zhang

Hongbin Liu

Yue Wang

Jizheng Xu

Zhipin Deng

Ye-Kui Wang

Yang Wang

Weijia Zhu

Marta Karczewicz

Na Zhang

Jianle Chen

Ying Huang

Bo Hu

Xi Wang

Cheng Feng

Kui Fan

Yulei Liu

Tingyong Tang

Wei-Jung Chien

Huijiao Yang

Ruiyi Zhou

Wei Li

Zhipei Wang

Li Zhang

Bosen He

Zhengkai Xie

Saeed Nikayin

Gilbert Loera

Xin Qing

Xiang Yang Li

Yue Li

Yuwen He

Hsiao Chiang Chuang

Sha Mo

Sirui Liu

Junru Li

Xin Zhao

Yi-Wen Chen

Siwei Ma

Andrew Hyungwoo Choi

Renfang Liu

Lei Guan

Brian H Thomas

Aaron Lorkowski

Lidong Qin

Yingge Li

Yu-Chen Sun

Yang Li

Tianliang Fu

Kenneth Brown

Xiang Li

Meng Wang

Done Bugdayci Sansli

Pingkai Ouyang

Shiqi Wang

Jiahao Li

Kai Guo

Ke Wang

Zheng Fang

Dong Bo Zhao

Lei Zheng

Yu Han

Hallie E Brinkerhuff

Ning Zhu

Danzhi Chen

Wenbin Yin

Vadim Seregin

Hao Wu

Hsiao-Chiang Chuang

Ning Ma

Hao Tang

Lan Zou

Michael E Hawkins

Hui Zhang

Amir Said

Wei He

Robert A Hodorek

Qi Yu

Vijayaraghavan Thirumalai

Cheng-Teh Hsieh

Ping Chen

Jun Huang

Haitao Xia

Sungwon Lee

Wenjiao Lin

Ping Song

Dirk Pletcher

Shaochun Zhuang

Zhenan Guan

Ge Chen

Willie Perez

Fengxin Wang

Ralf Klabunde

Shudong Ruan

Junjie Tao

John Jindra

Techniques for video processing, including video coding, video decoding and video transcoding are described. One example method includes performing a conversion between a video picture that includes one or more tiles and one or more rectangular slices and a bitstream of the video according to a rule. The rule specifies that, for iteratively determining information about the one or more rectangular slices, a variable indicating a tile index is updated only for slices having indices that are smaller than a value equal to a number of slices in the video picture minus 1.

Coding of pictures containing slices and tiles

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 using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined 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, where the performing the conversion includes deriving, according to a rule, boundary samples by applying a left bit shift operation or a right bit shift operation on a sum of at least one reference boundary sample, and where the rule determines whether to apply the left bit shift or the right bit shift operation.

Calculation in matrix-based intra prediction

A method of video processing includes determining, for a conversion between a picture of a video that includes one or more blocks and a bitstream representation of the video, whether a virtual boundary is enabled for a block within the picture for a filtering process based on a rule related to a relationship between a bottom boundary of the block and the picture. The method also includes performing the conversion based on the determining.

Handling video unit boundaries and virtual boundaries

Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: determining, during a conversion between a current block of a video and a bitstream, reference samples of a sub-template of the current block based on a first set of reference samples of the sub-template in a first reference list and a second set of reference samples of the sub-template in a second reference list; and determining a target motion candidate list based on the reference samples of the sub-template. Compared with the conventional solution, the proposed method can advantageously improve the coding efficiency.

Adaptive motion candidate list

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 using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and followed by an upsampling operation, where the upsampling operation is performed, in both a vertical direction and a horizontal direction in a fixed order, on samples obtained from the matrix vector multiplication operation.

Matrix-based intra prediction using upsampling

A method for video processing is provided to comprise: determining a motion vector precision of one or more motion vectors related to a current video block of a video; selecting, based on the motion vector precision, a motion vector range; and performing, based on the motion vector range, a conversion between the current video block and a bitstream representation of the video.

Motion vector range based on motion vector precision

A method includes determining, for a conversion between a video block of a video and a bitstream of the video, a size of prediction block corresponding to the video block according to a rule. The method also includes performing the conversion based on the determining. The rule specifies that a first size of the prediction block is determined responsive to whether a prediction refinement using optical flow technique is used for coding the video block. The video block has a second size and is coded using an affine merge mode or an affine advanced motion vector prediction mode.

Prediction refinement for affine merge and affine motion vector prediction mode

Systems, methods, apparatus for video processing are described. A video processing method includes indicating, in a syntax element of a bitstream, a partitioning scheme of a plurality of partitioning schemes, wherein the partitioning scheme is applied to partition a current block in a video block, and performing a conversion between a visual media data and the bitstream based on partitioning scheme indicated in the syntax element.

Partition signaling in video coding

A method of video processing includes performing a conversion between a video and a bitstream of the video according to a rule. The rule specifies that a sub-bitstream extraction process is implemented to generate a sub-bitstream for decoding. The sub-bitstream extraction process is configured to extract, from the bitstream, a sub-bitstream with a target highest temporal identifier. The rule specifies that, during the extracting, upon removing a video coding layer (VCL) network abstraction layer (NAL) unit, filler data units and filler supplemental enhancement information (SEI) messages in SEI NAL units that are associated with the VCL NAL unit are also removed.

Processing of filler data units in video streams

A mechanism for processing video data is disclosed. A parent block is partitioned with an Extended Ternary-Tree (ETT) partition to create three sub-blocks. At least one of the sub-blocks includes a side with a measurement that is not a power of two. A conversion is performed between a visual media data and a bitstream based on the sub-blocks.

Video decoder initialization information signaling

A mechanism and method for processing video data is disclosed. The video processing method includes determining whether to enable a second partitioning scheme for coding of a current video unit according to a rule. The method includes performing a conversion between a video media data and a bitstream based on the rule.

Duplicate partitioning prevention

A visual media processing method includes performing a conversion between a current video block of a visual media data and a bitstream representation of the current video block. The bitstream representation is configured according to a format rule that specifies that a syntax element is selectively included or excluded in the bitstream representation indicative of a maximum number of merge candidates for a coding tool, thereby indicating whether the coding tool is enabled or disabled for the conversion. The maximum number of merge candidates for the coding tool is zero or a positive number.

Transform block size restriction in video coding

A method for processing a video includes performing a determination, by a processor, that a first video block is partitioned to include a first prediction portion that is non-rectangular and non-square; adding a first motion vector (MV) prediction candidate associated with the first prediction portion to a motion candidate list associated with the first video block, wherein the first MV prediction candidate is derived from a sub-block MV prediction candidate; and performing further processing of the first video block using the motion candidate list.

Conditional application of inter prediction with geometric partitioning in video processing

A mechanism for processing video data is disclosed. A conversion is performed between a visual media data including a plurality of video units and a bitstream. A guided filter is applied to samples in the video units. The guided filter is applied at a post decoding stage, such as in an in-loop filtering process.

Guided filter usage

A mechanism for processing video data implemented by a video coding apparatus is disclosed. The mechanism determines to apply template-based intra mode derivation (TIMD) to a block based on whether the block is dyadic or non-dyadic, where TMID is associated with intra prediction. A conversion between a visual media data and a bitstream is performed by applying intra prediction to the block based on TIMD.

Intra-prediction on non-dyadic blocks

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Kai Zhang