US 12,225,236 B2
Miscellaneous signaling concepts for multi-layer video bitstreams and for output timing derivation
Yago Sánchez De La Fuente, Berlin (DE); Karsten Sühring, Berlin (DE); Cornelius Hellge, Berlin (DE); Thomas Schierl, Berlin (DE); Robert Skupin, Berlin (DE); and Thomas Wiegand, Berlin (DE)
Assigned to FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
Appl. No. 18/008,534
Filed by FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
PCT Filed Jun. 9, 2021, PCT No. PCT/EP2021/065442
§ 371(c)(1), (2) Date Dec. 6, 2022,
PCT Pub. No. WO2021/250087, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 20179393 (EP), filed on Jun. 10, 2020.
Prior Publication US 2023/0345051 A1, Oct. 26, 2023
Int. Cl. H04N 19/70 (2014.01); H04N 19/172 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/70 (2014.11) [H04N 19/172 (2014.11); H04N 19/46 (2014.11)] 14 Claims
OG exemplary drawing
 
1. A decoder for decoding a video data stream, the decoder comprising:
at least one processor configured to perform operations comprising:
decoding a parameter set including a first syntax element indicating whether network abstraction layer (NAL) hypothetical reference decoder (HRD) parameters are present, a second syntax element indicating whether video coding layer (VCL) hypothetical reference decoder (HRD) parameters are present, a fixed-picture rate flag indicative of whether a picture output involves a fixed picture rate within a coded video sequence, and, if the fixed-picture rate flag indicates that the picture output involves a fixed picture rate within the coded video sequence, an elemental output picture duration syntax element; and
based at least in part on determining that the first syntax element indicates that NAL HRD parameters are not present and the second syntax element indicates that VCL HRD parameters are not present:
determining elemental picture output times for the coded video sequence based on the elemental output picture duration syntax element; and
inferring that a picture output multiplication syntax element in a picture timing supplemental enhancement information message of the video data stream, which reveals information on whether or not a respective access unit is subject to multiplied output and, if so, how many sequential output pictures are to be generated out of the respective access unit, indicates non multiplied output.