公开(公告)号：US20210203967A1

公开(公告)日：2021-07-01

申请号：US17038541

申请日：2020-09-30

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Shan LIU ,  Stephan WENGER

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/169 ,  H04N19/174

Abstract: A method of decoding an encoded video bitstream using at least one processor, including: obtaining from the encoded video bitstream a coded video sequence including a picture unit corresponding to a coded picture; obtaining a picture header (PH) network abstraction layer (NAL) unit included in the picture unit; obtaining at least one video coding layer (VCL) network abstraction layer (NAL) unit included in the picture unit; decoding the coded picture based on the PH NAL unit, the at least one VCL NAL unit, and an adaptation parameter set (APS) included in an APS NAL unit obtained from the coded video sequence; and outputting the decoded picture, wherein the APS NAL unit is available to the at least one processor before the at least one VCL NAL unit.

公开(公告)号：US20210092447A1

公开(公告)日：2021-03-25

申请号：US17019692

申请日：2020-09-14

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Stephan Wenger ,  Shan Liu

IPC: H04N19/70 ,  H04N19/46 ,  H04N19/513 ,  H04N19/105 ,  H04N19/172 ,  H04N19/80 ,  H04N19/132 ,  H04N19/186

Abstract: A method, computer program, and computer system is provided for video coding. Coded syntax elements corresponding to wrap-around padding process are decoded. At least one coded current picture is reconstructed using wrap-around padding process. The syntax elements indicate an offset value for wrap-around processing; or left and right padding width information. A flag indicates whether syntax elements corresponding to wrap-around padding process is present in parameter set. A pixel position for motion compensated prediction in a reference picture is determined by interpreting the syntax elements corresponding to wrap-around padding process with a clipping process.

公开(公告)号：US20210092446A1

公开(公告)日：2021-03-25

申请号：US17019959

申请日：2020-09-14

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Stephan WENGER ,  Shan LIU

IPC: H04N19/65 ,  H04N19/30 ,  H04N19/159 ,  H04N19/176

Abstract: A method of decoding an encoded video bitstream using at least one processor includes obtaining a coded video sequence from the encoded video bitstream; obtaining a first syntax element indicating a number of a plurality of layers included in the coded video sequence; obtaining a second syntax element indicating whether the plurality of layers included in the coded video sequence are all independent layers; based on the first syntax element indicating that the number of the plurality of layers is greater than one, and the second syntax element indicating that the plurality of layers are not all the independent layers, obtaining a third syntax element indicating an output mode; determining the output mode based on the third syntax element; determining one or more output layers from among the plurality of layers based on the determined output mode; and outputting the one or more output layers.

公开(公告)号：US20200288174A1

公开(公告)日：2020-09-10

申请号：US16459883

申请日：2019-07-02

Applicant: TENCENT AMERICA LLC

Inventor： Stephan WENGER ,  Byeongdoo CHOI ,  Shan LIU

IPC: H04N19/70 ,  H04N19/169

Abstract: An approach for reconstructing a Network Abstraction Layer (NAL) unit for video decoding using at least one processor includes decoding a first syntax element included in a NAL unit header; determining, based on the first syntax element, a NAL unit class including a plurality of NAL unit types; decoding a second syntax element included in the NAL unit header; and based on the NAL unit class being a first NAL unit class, determining a NAL unit type from among the NAL unit types using a combination of the NAL unit class and the second syntax element. and reconstructing the NAL unit based on the determined NAL unit type; and based on the NAL unit class being a second NAL unit class, determining a temporal identifier (TID) based on the second syntax element, and reconstructing the NAL unit based on the determined TID.

公开(公告)号：US20200213617A1

公开(公告)日：2020-07-02

申请号：US16710936

申请日：2019-12-11

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Weiwei Feng ,  Shan Liu

IPC: H04N19/563 ,  H04N19/597 ,  H04N19/91

Abstract: Reconstructing a coded current picture for video decoding including decoding picture partitioning information corresponding to the current picture; determining whether padding is applied to sub-regions of the current picture using the picture partitioning information; based on determining that padding is not applied, decoding the sub-regions without padding the plurality of sub-regions; based on determining that padding is applied, determining whether the padding includes wrap-around padding using the picture partitioning information; based on determining that the padding does not include wrap-around padding, applying repetition padding to the sub-regions, and decoding the sub-regions using the repetition padding; based on determining that the padding includes wrap-around padding, applying the wrap-around padding to the sub-regions, and decoding the sub-regions using the wrap-around padding; and reconstructing the current picture based on the decoded sub-regions.

公开(公告)号：US20250142103A1

公开(公告)日：2025-05-01

申请号：US19011256

申请日：2025-01-06

Applicant: Tencent America LLC

Inventor： Byeongdoo CHOI ,  Shan LIU ,  Stephan WENGER

IPC: H04N19/44 ,  H04N19/169 ,  H04N19/172 ,  H04N19/46

Abstract: A method of decoding an encoded video bitstream using at least one processor includes obtaining a video coding layer (VCL) network abstraction layer (NAL) unit; determining whether the VCL NAL unit is a first VCL NAL unit of a picture unit (PU) containing the VCL NAL unit; based on determining that the VCL NAL unit is the first VCL NAL unit of the PU, determining whether the VCL NAL unit is a first VCL NAL unit of an access unit (AU) containing the PU; and based on determining that the VCL NAL unit is the first VCL NAL unit of the AU, decoding the AU based on the VCL NAL unit.

公开(公告)号：US20240305809A1

公开(公告)日：2024-09-12

申请号：US18668535

申请日：2024-05-20

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Stephan WENGER ,  Shan LIU

IPC: H04N19/46 ,  H04N19/169 ,  H04N19/174 ,  H04N19/82

CPC classification number: H04N19/46 ,  H04N19/174 ,  H04N19/188 ,  H04N19/82

Abstract: A method, computer program, and computer system is provided for coding video data. Video data including one or more subpictures is received. A network abstraction layer (NAL) unit type associated with each of the one or more subpictures is identified based on checking a flag corresponding to mixed NAL units in the one or more subpictures. The video data is decoded based on the identified NAL unit types.

公开(公告)号：US20240179319A1

公开(公告)日：2024-05-30

申请号：US18431652

申请日：2024-02-02

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Stephan WENGER ,  Shan LIU

IPC: H04N19/132 ,  H04N19/146 ,  H04N19/172 ,  H04N19/184 ,  H04N19/196

CPC classification number: H04N19/132 ,  H04N19/146 ,  H04N19/172 ,  H04N19/184 ,  H04N19/196

Abstract: A method, device, and computer-readable medium for decoding an encoded video bitstream using at least one processor, including obtaining a flag indicating that a conformance window is not used for reference picture resampling; based on the flag indicating that the conformance window is not used for the reference picture resampling, determining whether a resampling picture size is signaled; based on determining that the resampling picture size is signaled, determining a resampling ratio based on the resampling picture size; based on determining that the resampling picture size is not signaled, determining the resampling ratio based on an output picture size; and performing the reference picture resampling on a current picture using the resampling ratio.

公开(公告)号：US20240107045A1

公开(公告)日：2024-03-28

申请号：US18524806

申请日：2023-11-30

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Shan Liu ,  Stephan Wenger

IPC: H04N19/44 ,  H04N19/503

CPC classification number: H04N19/44 ,  H04N19/503

Abstract: 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.

公开(公告)号：US20240098269A1

公开(公告)日：2024-03-21

申请号：US18510468

申请日：2023-11-15

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Stephan Wenger ,  Shan Liu

IPC: H04N19/136 ,  H04N19/174 ,  H04N19/46 ,  H04N19/70 ,  H04N19/91

CPC classification number: H04N19/136 ,  H04N19/174 ,  H04N19/46 ,  H04N19/70 ,  H04N19/91

Abstract: Methods and systems are provided for decoding at least one video stream. A method includes receiving a first network abstraction layer (NAL) unit of a first slice of a coded picture and a second VCL NAL unit of a second slice of the coded picture, the first VCL NAL unit having a first VCL NAL unit type and the second VCL NAL unit having a second VCL NAL unit type that is different from the first VCL NAL unit type, and decoding the coded picture, the decoding including determining a picture type of the coded picture based on the first VCL NAL unit type of the first VCL NAL unit and the second VCL NAL unit type of the second VCL NAL unit, or based on an indicator, received by the at least one processor, indicating that the coded picture includes mixed VCL NAL unit types.