Qualcomm Incorporated

Bytedance Inc.

Huawei Technologies Co., Limited

Beijing Bytedance Network Technology Co., Ltd.

Nokia Corporation

Lemon Inc.

Nokia Technologies Oy

Future Wei Technologies, Inc.

Conversant Wireless Licensing S.a R.l.

Velos Media, LLC

Zhejiang University

Core Wireless Licensing S.a.r.l.

Amotech Co., Ltd.

Bytdance Inc.

Sisvel International S.a.

Ye-Kui Wang

Fnu Hendry

Li Feng Zhang

Ying Hai Chen

Kai Zhang

Adarsh Krishnan Ramasubramonian

Jianle Chen

Zhipin Deng

Miska Matias Hannuksela

Jizheng Xu

Krishnakanth Rapaka

Marta Karczewicz

Li Zhang

Kui Fan

Vadim Seregin

Xiang Yang Li

Thomas Stockhammer

Weijia Zhu

Hongbin Liu

Muhammed Zeyd Coban

Yang Wang

Rajan Laxman Joshi

Chao Pang

Yue Wang

Hong Heather Yu

Wei Pu

Wei-Jung Chien

Xianglin Wang

Haitao Yang

Xiang Li

Yuqun Fan

F N U Hendry

Huameng Fang

Hongbing Li

Peiyun Di

Houqiang Li

Igor D Curcio

Chunbo Zhu

Maxim Borisovitch Sychev

Geert Van Der Auwera

Joel Sole Rojals

Emre Baris Aksu

Dmytro Rusanovskyy

Nikolai Konrad Leung

Vladyslav Zakharchenko

Tingfang Tang

Yuejing Yin

Gordon Kent Walker

Ning Bi

Yin Zhao

Yue Chen

Lu Yu

Bijan Forutanpour

Haibin Yin

Hualong Yu

Yunchao Gao

Lingyu Li

Semih Esenlik

Sujeet Shyamsundar Mate

Jun Tian

Giridhar Dhati Mandyam

Zhijie Zhao

Charles Nung Lo

Peng Zhang

Lei Zhang

Yu Huang

Cheng-Teh Hsieh

Sungwon Lee

Done Bugdayci Sansli

Waqar Zia

Imed Bouazizi

Justin Ridge

Sanqi Li

Phi Hung Nguyen

Stephan Wenger

Johannes Sauer

Yi Guo

Juha Tapani Purho

Yiliang Bao

Varun Singh

Hendry

Xiaoding Gao

Jörg Ott

Xiangyu Lin

Jegadish Devadoss

Dong Tian

Marta Karczweicz

Jeffrey Moguillansky

Dejung Zhang

Ying Chen

A method of decoding implemented by a video decoder including determining, by the video decoder, whether a resolution of a current picture being decoded is the same as the resolution of reference pictures identified by a reference picture list associated with the current picture; enabling, by the video decoder, bi-direction optical flow (BDOF) for a current block of the current picture when the resolution of the current picture is determined to be the same as the resolution of each of the reference pictures; disabling, by the video decoder, the BDOF for the current block of the current picture when the resolution of the current picture is determined to be different than the resolution of either of the reference pictures; and refining, by the video decoder, motion vectors corresponding to the current block using the BDOF when the BDOF is enabled for the current block.

Handling of bi-directional optical flow (BIO) coding tool for reference picture resampling in video coding

A video coding mechanism is disclosed. The mechanism includes partitioning a picture into a plurality of tiles. A number of the tiles are included in a tile group. A flag is also encoded into a parameter set of a bitstream. The flag is set to a first value when the tile group is a raster scan tile group and a second value when the tile group is a rectangular tile group. The tiles are encoded into the bitstream based on the tile group. The bitstream is stored for communication toward a decoder.

Harmonization of raster scan and rectangular tile groups in video coding

Methods and apparatus for video processing are described. The video processing may include video encoding, video decoding or video transcoding. One example video processing method includes performing a conversion between a video including one or more pictures including one or more slices and a coded representation of the video, wherein the coded representation conforms to a format rule that specifies that a condition of a field in the coded representation controls a constraint on a slice type or whether the slice type is included in the coded representation for a video slice, wherein the field includes a general constraint flag, a network abstraction layer unit type or whether the video slice is in a first video picture of an access unit.

Slice type in video coding

A video coding mechanism is disclosed. The mechanism includes receiving an extracted bitstream that is a result of a sub-bitstream extraction process from an input bitstream containing a set of sub-pictures. The extracted bitstream contains only a subset of the sub-pictures of the input bitstream to the sub-bitstream extraction process. A flag from the extracted bitstream is set to indicate that sub-picture information related to the subset of the sub-pictures is present in the extracted bitstream. One or more sub-picture identifiers (IDs) for the subset of the sub-pictures are obtained based on the flag. The subset of the sub-pictures is decoded based on the sub-picture IDs.

Video coding bitstream extraction with identifier signaling

Methods, apparatus, systems for video processing, including video encoding or video decoding are described. One example method includes performing a conversion between a video comprising a video picture that includes a video slice and a bitstream of the video. The bitstream conforms to a format rule specifying that, in case a slice type of the video slice is type P and temporal motion vector prediction is enabled, usage of reference picture resampling (RPR) for a reference picture in a collocated reference picture list is disabled. The reference picture is indicated by a reference index of a collocated picture of the video slice used for the temporal motion vector prediction.

Reference picture resampling activation in video coding

A mechanism for processing video data is disclosed. A conversion is performed between a visual media data and a visual media data file. The visual media data file includes pictures in layers, a random access recovery point (roll) sample group specifying access points into the layers, and a grouping type parameter. The grouping type parameter specifies a correspondence between the access points and relevant layers of the layers. The grouping type parameter includes a layer identifier method identification code parameter specifying that the access points include one or more of: one or more gradual decoding refresh (GDR) pictures; and one or more mixed network abstraction layer (NAL) unit pictures with both an intra random access point (IRAP) subpicture and a non-IRAP subpicture.

Roll sample group in VVC video coding

A mechanism for processing video data is disclosed. Video decoder initialization information is signaled between an encoder to a decoder. The video decoder initialization information contains a range of initialization parameters. A conversion is performed between a visual media data and a visual media data file based on the range of initialization parameters.

Video decoder initialization information

A video coding mechanism is disclosed. The mechanism includes partitioning a picture into a plurality of first level tiles. A subset of the first level tiles is partitioned into a plurality of second level tiles. The first level tiles and the second level tiles are encoded into a bitstream. A split indication is encoded into the bitstream. The split indication indicates that at least one of the first level tiles is split into the second level tiles. The bitstream is stored for communication toward a decoder.

Flexible tile signaling in video coding

Examples of video encoding methods and apparatus and video decoding methods and apparatus are described. An example method of video processing includes performing a conversion between a video and a bitstream of the video. The bitstream includes network abstraction layer (NAL) units for multiple video layers according to a rule. The rule defines a sub-bitstream extraction process by which NAL units are removed from the bitstream to generate an output bitstream, and specifies to remove all supplemental enhancement information (SEI) NAL units that contain a non-scalable-nested SEI message with a particular payload type, responsive to a list of NAL unit header layer identifier values in an output layer set (OLS) with a target OLS index not including all values of NAL unit header layer identifiers in all video coding layer (VCL) NAL units in the bitstream that is input to the sub-bitstream extraction process.

Handling different NAL types in video sub-bitstream extraction

A method of digital media processing includes performing a conversion between a media segment and a bitstream of the media segment. The conversion conforming to a format rule and an encryption rule. The format rule specifying that verification information, which includes an indication of an integrity of a portion of the media segment, is signaled in the bitstream.

Indication of digital medial integrity

Methods, devices, and systems for configuring different access units in scalable video coding are described. In one example aspect, a method of video processing include performing a conversion between a video having one or more pictures in one or more video layers and a bitstream of a video. The bitstream includes a coded video sequence that has one or more access units. The bitstream further includes a first syntax element indicating whether an access unit includes a picture for each video layer making up the coded video sequence.

Random access point access unit in scalable video coding

A method of decoding includes encountering an end of tile bit with a first value and byte alignment bits in a video bitstream, which indicate that a current coding tree block (CTB) is a last CTB in a tile; encountering an end of CTB row bit with the first value and the byte alignment bits in the video bitstream, which indicate that waveform parallel processing (WPP) is enabled and that the current CTB is the last CTB in a CTB row but not the last CTB in the tile; and reconstructing the plurality of CTBs in the tile based on the end of tile bit with the first value, the end of CTB row bit with the first value, and the byte alignment bits.

Wavefront parallel processing for tile, brick, and slice

A method of decoding a coded video bitstream is provided. The method includes receiving the coded video bitstream, wherein the coded video bitstream contains a clean random access (CRA) picture and a first flag having a first value; setting a second value of a second flag equal to the first value of the first flag; emptying, by the video decoder, any previously-decoded pictures from a decoded picture buffer (DPB) based on the second flag having the second value; and decoding a current picture after the DPB has been emptied. A corresponding method of encoding is also provided.

Output of prior pictures for pictures starting a new coded video sequence in video coding

A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a flag and a picture including a sub-picture with a sub-picture boundary. The sub-picture is decoded. Filtering operations are performed across the sub-picture boundary when the flag is set to a first value. The filtering operations across the sub-picture boundary are omitted when the flag is set to a second value. The sub-picture is forwarded for display as part of a decoded video sequence.

Sub-picture level filtering in video coding

An example method of video processing includes applying, in a conversion between a video comprising multiple components and a bitstream representation of the video, a deblocking filter to video blocks of the multiple components. A deblocking filter strength for the deblocking filter of each of the multiple components is determined according to a rule that specifies to use a different manner for determining the deblocking filter strength for the video blocks of each of the multiple components.

Using quantization groups in video coding

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Ye-Kui Wang