Tencent America LLC

Vidyo, Inc.

Stephan Wenger

Shan Liu

Byeongdoo Choi

Shuai Zhao

Arianne Hinds

Sehoon Yea

Xiang Yang Li

Rohit Abhishek

Xiaozhong Xu

Jill MacDonald Boyce

Arash Vosoughi

Xin Zhao

Danny Hong

Xiang Li

Iraj Sodagar

Paul Spencer Dawkins

Wei Jiang

Yixin Du

Ling Li

Wei W Wang

Jing Ye

Meng Xu

Liang Zhao

Wen Gao

Jonathan Michael Lennox

Zeqiang Li

Stephen Cipolli

Xiang Zhang

Wei Wang

Tal Shalom

Wonkap Jang

Isaac Levy

Meir Sela

Won Kap Jang

Jonathan Lennox

An approach for reconstructing a current Network Abstraction Layer (NAL) unit for video decoding using at least one processor includes determining the current NAL unit to be an Intra Random Access Picture (IRAP) NAL unit; determining whether a previous NAL unit decoded immediately before the current NAL unit indicates an end of a coded video sequence (CVS); based on determining that the previous NAL unit indicates the end of the CVS, decoding the current NAL unit as one from among an Instantaneous Decoder Refresh (IDR) NAL unit or a Broken Link Access (BLA) NAL unit; and based on determining that the previous NAL unit does not indicate the end of the CVS, decoding the current NAL unit as a Clean Random Access (CRA) NAL unit, and reconstructing the decoded current NAL unit.

Identification of random access point and picture types

A method, computer program, and computer system is provided for aligning across layers in a coded video stream. A video bitstream having multiple layers is decoded. One or more subpicture regions are identified from among the multiple layers of the decoded video bitstream, the subpicture regions including a background region and one or more foreground subpicture regions. An enhanced subpicture is decoded and displayed based on a determination that a foreground subpicture region is selected. The background region is decoded and displayed based on a determination that a foreground subpicture region was not selected.

Method for alignment across layers in coded video stream

A method, computer program, and computer system is provided for video coding. The method may include decoding coded syntax elements corresponding to a wrap-around padding process based on shifting a reference block by a width value that is determined based on luma samples in the reference block; and reconstructing at least one coded current picture using the wrap-around padding process, wherein the wrap-around padding process is applied at boundaries of subpictures.

Method for padding processing with sub-region partitions in video stream

A method of video encoding includes determining whether a plurality of constraint flags of a constraint information group are to be signaled for a subset of coding blocks, and signaling a gate flag indicating whether the plurality of constraint flags of the constraint information group are signaled. The gate flag is signaled in constraint information in a syntax structure of a coded video bitstream. In accordance with the signaled gate flag indicating that the plurality of constraint flags of the constraint information group are signaled, the method further includes signaling the plurality of constraint flags of the constraint information group in the constraint information in the syntax structure of the coded video bitstream. In accordance with the plurality of constraint flags being signaled in the constraint information, the method further includes encoding the subset of coding blocks based on the plurality of constraint flags.

Constraint flags in general constraints information

A method, computer program, and computer system is provided for streaming immersive media. Content is ingested in a first two-dimension format or a first three-dimensional format, whereby the format references a neural network. The ingested content is converted to a second two-dimensional or a second three-dimensional format based on the referenced neural network. The converted content is streamed to a client end-point, such as a television, a computer, a head-mounted display, a lenticular light field display, a holographic display, an augmented reality display, or a dense light field display.

Reference of neural network model by immersive media for adaptation of media for streaming to heterogenous client end-points

Aspects of the disclosure provide methods and apparatuses for video data processing. In some examples, an apparatus for video data processing includes processing circuitry. For example, the processing circuitry determines a first syntax element for coding control in a first scope of coded video data in a bitstream. The first syntax element is associated with a coding tool of a slice based Rice coding for a residual coding in a transform skip mode. The coding tool provides a Rice parameter at a slice level for the residual coding in the transform skip mode. In response to the first syntax element being a first value indicative of disabling of the coding tool in the first scope, the processing circuitry decodes the first scope of coded video data that includes one or more second scopes of coded video data without invoking the coding tool.

General constraints information for transform skip

A method of decoding an encoded video bitstream using at least one processor includes obtaining a coded video sequence including a plurality of output layer sets from the encoded video bitstream; obtaining a first flag indicating whether each output layer set of the plurality of output layer sets includes more than one layer; based on the first flag indicating that the each output layer set includes more than the one layer, obtaining a first syntax element indicating an output layer set mode; selecting at least one layer from among layers included in the plurality of output layer sets as at least one output layer based on at least one of the first flag and the first syntax element; and outputting the at least one output layer.

Signaling of output layer set for scalable video stream

A method of generating a coded video bitstream including setting a flag pps_ref_wraparound_enabled_flag, wherein the flag pps_ref_wraparound_enabled_flag being equal to 1 specifies that a horizontal wrap-around motion compensation is enabled for pictures referring to a picture parameter set (PPS) in a coded video stream; determining whether the reference picture is to be scaled based on whether reference picture resampling is enabled; in response to the reference picture being not scaled, setting a second flag refWraparoundEnabledFlag to be equal to a value of the flag pps_ref_wraparound_enabled_flag; and encoding the coded video bitstream comprising at least the current picture and the flag pps_ref_wraparound_enabled_flag.

Method for wrap around motion compensation with reference picture resampling

A method of and a device for decoding a video stream including at least two coded video sequences that each use a respective first parameter set that differ in at least one value from each other, and each of the at least two coded video sequences including at least two coded pictures, and the at least two coded video sequences have different presentation times. The method including decoding and activating, by a decoder, a single second parameter set pertaining to all video sequences of the video stream before any coded picture of the at least two coded video sequences is decoded.

Method and device using high layer syntax architecture for coding and decoding

A method and system for decoding a coded video sequence may include obtaining the coded video sequence, and decoding the coded video sequence. A a value of a temporal sublayer identifier of a video coding layer (VCL) network abstraction layer (NAL) unit in the coded video sequence is constrained to be less than or equal to a value of vps_max_sublayers_minus1, that specifies a maximum number of temporal sublayers that may be present in a layer in each coded video sequence referring to the video parameter set (VPS), in the VPS referred to by the VCL NAL unit.

Derivation on sublayer-wise output layer set

Media data of a first scene graph is received. The first scene graph is created based on a first scene graph format. The first scene graph format includes a plurality of description components indicating attributes of the first scene graph. A plurality of metadata identifiers associated with the first scene graph format and a plurality of metadata identifiers associated with a second scene graph format are determined based on a lookup table. The lookup table identifies metadata identifiers associated with the first and second scene graph formats. A plurality of description components of the second scene graph format that indicates the attributes of the first scene graph is determined based on (i) the plurality of description components of the first scene graph format, (ii) the plurality of metadata identifiers associated with the first scene graph format, and (iii) the plurality of metadata identifiers associated with the second scene graph format.

Scene graph translation

Aspects of the disclosure provide methods and apparatuses for video data processing. In some examples, an apparatus for video data processing includes processing circuitry. For example, the processing circuitry determines a first syntax element for coding control in a first scope of coded video data in a bitstream. The first syntax element is associated with a coding tool for coding a position of a last significant coefficient during an entropy coding of transform coefficients. Then, in response to the first syntax element being a first value indicative of disabling of the coding tool in the first scope, the processing circuitry decodes the first scope of coded video data in the bitstream that includes one or more second scopes of coded video data without invoking the coding tool.

Techniques for constraint flag signaling for range extension with coding for last significant coefficient

Systems and methods for decoding a coded video stream are provided. A method includes receiving a coded video stream that includes an access unit, including a picture; signaling a first flag that indicates whether the access unit includes either or neither one from among an intra random access point (IRAP) picture and a gradual decoding refresh (GDR) picture; signaling a second flag that indicates whether the picture is the IRAP picture; and decoding the picture, as a current picture, based on the signaling of the first flag and the second flag, wherein a value of the first flag and a value of the second flag are aligned.

Techniques for random access point indication and picture output in coded video stream

Method, device, and non-transitory storage medium for generating crowdsourced holographic views are provided. The method may include receiving one or more images of a same scene from one or more imaging devices, where each of the one or more imaging devices is at different locations. The method may further include generating a 3D model of the same scene based on the one or more images and streaming immersive media for rendering a holographic display of the same scene based on the 3D model based on determining that a display device is capable of displaying immersive media.

Generating holographic or lightfield views using crowdsourcing

A method of decoding an encoded video bitstream using at least one processor, including obtaining a first flag indicating whether a constant picture size is used in a coded video sequence including a current picture; based on the first flag indicating that the constant picture size is used, decoding the current picture without performing reference picture resampling; based on the first flag indicating that the constant picture size is not used, obtaining a second flag indicating whether a conformance window size is signaled; based on the second flag indicating that the conformance window size is signaled: obtaining the conformance window size, determining a resampling ratio between the current picture and a reference picture based on the conformance window size, and performing the reference picture resampling on the current picture using the resampling ratio.

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Hillsborough, CA, United States of America

Stephan Wenger