Constraints on signaling of video layers in coded bitstreams

    公开(公告)号:US11831894B2

    公开(公告)日:2023-11-28

    申请号:US17845536

    申请日:2022-06-21

    Applicant: Bytedance Inc.

    Inventor: Ye-kui Wang

    CPC classification number: H04N19/70 H04N19/105 H04N19/187 H04N19/46

    Abstract: A method of video processing includes performing a conversion between a video comprising a plurality of video layers and a bitstream of the video, wherein the bitstream comprises a plurality of output layer sets (OLSs), each of which comprises one or more of the plurality of video layers, and the bitstream conforms to a format rule, wherein the format rule specifies that, for a layer i, where i is an integer, the bitstream includes a set of first syntax element indicative of a first variable indicating whether the layer i is included in at least one of the plurality of OLSs.

    Constraints of slice count in a coded video picture

    公开(公告)号:US11825105B2

    公开(公告)日:2023-11-21

    申请号:US18076886

    申请日:2022-12-07

    Applicant: Bytedance Inc.

    Inventor: Ye-kui Wang

    Abstract: Methods, systems and devices for implementing constraints used in video encoding and video decoding are described. An example method of video processing includes performing a conversion between a video including one or more pictures including one or more slices and a bitstream of the video, wherein the bitstream is organized into a plurality of access units (AUs), AU 0 to AU n, based on a format rule, where n is a positive integer, wherein the format rule specifies a relationship between removal times of each of the plurality of AUs from a coded picture buffer (CPB) during decoding and a number of slices in the each of the plurality of AUs.

    Techniques for generation of a conformant output sub-bitstream

    公开(公告)号:US11825102B2

    公开(公告)日:2023-11-21

    申请号:US17992176

    申请日:2022-11-22

    Applicant: Bytedance Inc.

    Inventor: Ye-kui Wang

    CPC classification number: H04N19/188 H04N19/172 H04N19/31 H04N19/70

    Abstract: 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 including multiple layers and a bitstream of the video according to a rule, wherein the rule specifies that, in a first process of sub-bitstream extraction to output a first output sub-bitstream, the first output sub-bitstream is extracted without removing network abstraction layer (NAL) units of a particular type and having a particular NAL unit header identifier value, and wherein the particular type includes an access unit delimiter (AUD) NAL unit.

    Signaling of picture information in access units

    公开(公告)号:US11818381B2

    公开(公告)日:2023-11-14

    申请号:US17990945

    申请日:2022-11-21

    Applicant: Bytedance Inc.

    Inventor: Ye-kui Wang

    Abstract: Methods, systems and devices for signaling picture information in access units in video bitstream processing are disclosed. An example method of video processing includes performing a conversion between a video comprising one or more pictures and a bitstream of the video, wherein the bitstream conforms to a format rule, wherein the format rule specifies that a flag and a syntax element, when included in the bitstream, are access unit (AU) specific, and wherein the flag indicates, in response to a current AU not being a first AU in the bitstream in a decoding order, whether a nominal coded picture buffer (CPB) removal time of the current AU is determined relative to (a) a nominal CPB removal time of a previous AU associated with a buffering period supplemental enhancement information (SEI) message, or (b) a nominal CPB removal time of the current AU.

    Entropy coding for palette escape symbol

    公开(公告)号:US11812064B2

    公开(公告)日:2023-11-07

    申请号:US17965325

    申请日:2022-10-13

    Applicant: Bytedance Inc.

    CPC classification number: H04N19/70 H04N19/132 H04N19/176 H04N19/186

    Abstract: Methods, systems, and devices for performing entropy coding for a palette escape symbol in palette mode coding and decoding are described. An example method for video processing includes performing a conversion between a video having one or more video regions including a current video block and a bitstream representation of the video, wherein the bitstream representation conforms to a format rule that the current video block is coded using a palette mode coding tool, wherein a binarization of an escape symbol for the current video block uses an exponential-Golomb (EG) code of order K, wherein K is a non-negative integer that is unequal to three, and wherein the palette mode coding tool represents the current video block using a palette of representative color values and wherein the escape symbol is used for a sample of the current video block coded without using the representative color values.

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