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    SUB-BITSTREAM EXTRACTION OF MULTI-LAYER VIDEO BITSTREAMS
    133.
    发明公开
    SUB-BITSTREAM EXTRACTION OF MULTI-LAYER VIDEO BITSTREAMS 审中-公开

    公开(公告)号：US20240107048A1

    公开(公告)日：2024-03-28

    申请号：US18525250

    申请日：2023-11-30

    Applicant: Bytedance Inc.

    Inventor： Ye-kui Wang

    IPC: H04N19/46 ,  H04N19/105 ,  H04N19/169

    CPC classification number: H04N19/46 ,  H04N19/105 ,  H04N19/188

    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 and a bitstream of the video according to a rule, wherein the bitstream includes network abstraction layer (NAL) units for multiple video layers according to a rule; wherein the rule defines that a sub-bitstream extraction process to generate an output bitstream comprising an output layer set (OLS) includes one or more operations that are selectively performed responsive to the following conditions: (1) a list of NAL unit header layer identifier values in the OLS does not includes all values of NAL unit header layer identifiers in all video coding layer (VCL) NAL units in the bitstream, and (2) the output bitstream containing a supplemental enhancement information (SEI) NAL unit that contains a scalable-nesting SEI message.

    SUBLAYER SIGNALING IN A VIDEO BITSTREAM
    134.
    发明公开
    SUBLAYER SIGNALING IN A VIDEO BITSTREAM 审中-公开

    公开(公告)号：US20240107046A1

    公开(公告)日：2024-03-28

    申请号：US18518768

    申请日：2023-11-24

    Applicant: Bytedance Inc.

    Inventor： Ye-kui Wang

    IPC: H04N19/46 ,  H04N19/146 ,  H04N19/172 ,  H04N19/30 ,  H04N19/70

    CPC classification number: H04N19/46 ,  H04N19/146 ,  H04N19/172 ,  H04N19/30 ,  H04N19/70

    Abstract: Several techniques for video encoding and video decoding are described. One example method includes performing a conversion between a video and a bitstream of the video including one or more output layer sets (OLSs) according to a rule. The rule specifies that a subpicture level information (SLI) supplemental enhancement information (SEI) message includes information about a level of subpicture sequences in a set of coded video sequences of the one or more OLSs to which the SLI SEI message applies. A syntax structure of the SLI SEI message includes at least (1) a first syntax element specifying a maximum number of sublayers for the subpicture sequences and (2) a second syntax element specifying whether level information for the subpicture sequences is present for one or more sublayer representations.

    Constraints On Decoding Picture Buffer
    135.
    发明公开
    Constraints On Decoding Picture Buffer 审中-公开

    公开(公告)号：US20240107041A1

    公开(公告)日：2024-03-28

    申请号：US18525428

    申请日：2023-11-30

    Applicant: Bytedance Inc.

    Inventor： Ye-kui Wang

    IPC: H04N19/423 ,  H04N19/105 ,  H04N19/132 ,  H04N19/152 ,  H04N19/174

    CPC classification number: H04N19/423 ,  H04N19/105 ,  H04N19/132 ,  H04N19/152 ,  H04N19/174

    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 comprising one or more pictures comprising one or more slices and a bitstream of the video. The conversion conforms to a rule, and the bitstream is organized into one or more access units. The rule specifies a constraint on a number of decoded pictures stored in a decoded picture buffer (DPB). Each decoded picture of the decoded pictures is (i) marked as used for reference, (ii) has a flag indicative of the decoded picture being output, and (iii) has an output time later than a decoding time of a current picture.

    Identification Of Inter-Layer Reference Pictures In Coded Video
    139.
    发明公开
    Identification Of Inter-Layer Reference Pictures In Coded Video 审中-公开

    公开(公告)号：US20240080492A1

    公开(公告)日：2024-03-07

    申请号：US18510089

    申请日：2023-11-15

    Applicant: Bytedance Inc.

    Inventor： Ye-kui Wang ,  Li Zhang

    IPC: H04N19/70 ,  H04N19/169 ,  H04N19/172 ,  H04N19/46

    CPC classification number: H04N19/70 ,  H04N19/172 ,  H04N19/188 ,  H04N19/46

    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 and a bitstream of the video according to a rule. At least one of the one or more parameter sets of the bitstream includes a general syntax structure including timing and hypothetical reference decoder (HRD) parameters. The rule specifies that a first syntax flag is not included in the general syntax structure in response to (1) a second syntax flag specifying that network abstraction layer (NAL) HRD parameters are not present in the general syntax structure, and (2) a third syntax flag specifying that video coding layer (VCL) HRD parameters are not present in the general syntax structure, where the first syntax flag specifies that same picture-level timing information applies to all output layer sets in the bitstream.

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