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

Yulei Liu

Kui Fan

Tingyong Tang

Wei-Jung Chien

Huijiao Yang

Ruiyi Zhou

Wei Li

Zhipei Wang

Bosen He

Zhengkai Xie

Saeed Nikayin

Gilbert Loera

Xin Qing

Xiang Yang Li

Yue Li

Li Zhang

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

Michael E Hawkins

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

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

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

Video processing, including video coding, video decoding and video transcoding, is described. One example method includes performing a conversion between a video comprising a video picture and a bitstream of a video according to a rule, where the rule specifies that syntax elements indicate a first width and a first height of a scaling window for the video picture, and where the rule specifies that a range of permissible values for the syntax elements include values greater than or equal to two times a second width of the video picture and two times a second height of the video picture.

Scaling window in video coding

An example method of video processing includes determining, for a conversion between a current block of a current picture of a video and a bitstream of the video, whether to disable a coding tool for the current block; and performing the conversion based on the determining, wherein the coding tool is disabled when a dimension of a reference picture of one or more reference pictures of the current block is different from a dimension of the current picture, or a dimension of a scaling window in a reference picture of one or more reference pictures of the current block is different from a dimension of a scaling window in the current picture.

Interplay between reference picture resampling and video coding tools

Devices, systems and methods for digital video coding, which includes Prediction from Multiple Cross-components (PMC) methods, are described. An exemplary method for video processing includes making a first determination that a cross-component prediction (CCP) mode is disabled for a conversion between a video block of a video and a bitstream representation of the video and making a second determination, based on the first determination, regarding whether a first syntax element indicating usage of an enhanced Two-Step Cross-component Prediction Mode (TSCPM) coding tool or an enhanced cross-component linear model (CCLM) coding tool is included in the bitstream representation. The method also includes performing a conversion based on the second determination.

Cross-component prediction using multiple components

A method for processing video data is disclosed. The method includes determining a width (w) and a height (h) of a coding group based on a width (W) and a height (H) of a block that is non-dyadic and contains residual, processing the residual of the block in unit of the coding group, and performing a conversion between a visual media data and a bitstream according to a rule based on the processing.

Residual coding on non-dyadic blocks

Methods, systems and devices for sample string processing in intra coding are described. An example method of video processing includes determining, for a conversion between a video comprising a current block and a bitstream of the video, whether a first sample string of the current block forms a rectangle, and performing, based on the determining, the conversion, wherein the determining is based on a position and a length of the first sample string.

Sample string processing in intra coding

A mechanism for processing video data implemented by a video coding apparatus is disclosed. The mechanism determines usage of one or more of a separate tree coding and a partitioning beyond a minimum size threshold for a video unit. The mechanism also disables a cross-component coding tool for the video unit based on the determination. A conversion between a visual media data and a bitstream is performed in accordance with the coding tool being disabled.

Separate tree coding restrictions

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Kai Zhang