Patent ID: 11956457
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A system comprising:
at least one processor that is configured to receive a coded video stream that includes an access unit, including a picture
memory storing computer code, the computer code comprising:
receiving code configured to cause the at least one processor to receive video data;
encoding code configured to cause the at least one processor to encode the video data into a coded video stream that includes an access unit and a picture;
first signaling code configured to cause the at least one processor to signal 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
second signaling code configured to cause the at least one processor to signal 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.