US 11,956,457 B2
Techniques for random access point indication and picture output in coded video stream
Byeongdoo Choi, Palo Alto, CA (US); Stephan Wenger, Hillsborough, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed on Oct. 13, 2022, as Appl. No. 17/965,203.
Application 17/965,203 is a continuation of application No. 17/320,764, filed on May 14, 2021, granted, now 11,558,630.
Claims priority of provisional application 63/037,903, filed on Jun. 11, 2020.
Claims priority of provisional application 63/036,335, filed on Jun. 8, 2020.
Claims priority of provisional application 63/035,274, filed on Jun. 5, 2020.
Claims priority of provisional application 63/027,826, filed on May 20, 2020.
Prior Publication US 2023/0038756 A1, Feb. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/46 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/169 (2014.01); H04N 19/172 (2014.01)
CPC H04N 19/46 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/172 (2014.11); H04N 19/188 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method performed by at least one processor, the method comprising:
receiving video data;
encoding the video data into a coded video stream that includes an access unit and a picture;
signaling a first flag, in an access unit delimiter of the coded video stream, 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; and
signaling a second flag, in a picture header of the coded video stream, that indicates whether the picture is the IRAP picture,
wherein a value of the first flag and a value of the second flag are aligned, and
wherein encoding the video data is based on:
a reference picture list,
an unavailable reference picture in the reference picture list, and
bitstream conformance, for references pictures in the reference picture list, based on whether the following constraints apply:
a number of entries that are indicated to be in the reference picture list is not less than a number of active entries that are indicated to be in the reference picture list,
each picture referred to by an active entry in the reference picture list is present in a decoded picture buffer (DPB) and has a temporal identifier value less than or equal to a temporal identifier value of the current picture, and
each picture referred to by an entry in the reference picture list is not the current picture and is indicated by a picture header flag to potentially be a reference picture.