US 11,973,968 B2
Signaling of coded picture buffer information in video bitstreams
Ye-kui Wang, San Diego, CA (US)
Assigned to BYTEDANCE INC., Los Angeles, CA (US)
Filed by Bytedance Inc., Los Angeles, CA (US)
Filed on Nov. 21, 2022, as Appl. No. 17/990,959.
Application 17/990,959 is a continuation of application No. PCT/US2021/033785, filed on May 21, 2021.
Claims priority of provisional application 63/029,321, filed on May 22, 2020.
Prior Publication US 2023/0085717 A1, Mar. 23, 2023
Int. Cl. H04N 19/46 (2014.01); H04N 19/105 (2014.01); H04N 19/169 (2014.01); H04N 19/172 (2014.01); H04N 19/423 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/46 (2014.11) [H04N 19/105 (2014.11); H04N 19/172 (2014.11); H04N 19/188 (2014.11); H04N 19/423 (2014.11); H04N 19/70 (2014.11)] 19 Claims
OG exemplary drawing
 
1. A method of video processing, comprising:
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 first syntax element, when included in the bitstream, is access unit (AU) specific,
wherein a value of the first syntax element is based on whether an associated AU is an intra random access points (TRAP) AU or a gradual decoding refresh (GDR) AU,
wherein the value of the first syntax element specifies (i) whether a second syntax element is present in a buffering period (BP) supplemental enhancement information (SEI) message, and (ii) whether alternative timing information is present in a picture timing (PT) SEI message in a current BP,
wherein a value of the second syntax element indicates whether to use alternative coded picture buffer (CPB) parameters or not,
wherein the format rule specifies that a value of a third syntax element is based on a fourth syntax element that indicates whether a temporal distance between output times of consecutive pictures of a hypothetical reference decoder (HRD) is constrained and a variable that identifies a highest temporal sublayer to be decoded, and
wherein the third syntax element specifies a number of elemental picture period intervals that one or more decoded pictures of the current AU occupy for a display model.