Syntax for dependent random access point indication in video bitstreams
AssigneeLemon Inc.
InventorYe-Kui Wang
Life of this patent
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Abstract
Systems, methods and apparatus for encoding, decoding or transcoding visual media data are described. One example method of processing visual media data includes performing a conversion between visual media data and a bitstream of the visual media data according to a format rule, wherein the format rule specifies that a supplemental enhancement information (SEI) message that refers to a dependent random access point (DRAP) picture is included in the bitstream, and wherein the format rule further specifies that the SEI message includes a syntax element indicating a number of intra random access point (IRAP) pictures or dependent random access point (DRAP) pictures that are within a same coded layer video sequence (CLVS) as the DRAP picture.
Claims18
A method of processing visual media data, comprising:
- performing a conversion between visual media data and a bitstream of the visual media data according to a format rule,
- wherein the format rule specifies that a supplemental enhancement information (SEI) message that refers to a second type of dependent random access point (DRAP) picture which is different from a first type of DRAP picture is included in the bitstream, and
- wherein the format rule further specifies that the SEI message includes a syntax element indicating a number of intra random access point (IRAP) pictures or second type of DRAP pictures that are within a same coded layer video sequence (CLVS) as the second type of DRAP picture and are allowed to be included in active entries of a reference picture list of the second type of DRAP picture, and
- wherein the first type of DRAP picture is a picture that relies on an IRAP picture and is associated with the first type of SEI message, which is a first DRAP indication SEI message,
- wherein the second type of DRAP picture is a picture that is allowed to rely on an IRAP picture or another DRAP picture and is associated with the second type of SEI message, which is a second DRAP indication SEI message.
An apparatus for processing visual media data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
- perform a conversion between visual media data and a bitstream of the visual media data according to a format rule,
- wherein the format rule specifies that a supplemental enhancement information (SEI) message that refers to a second type of dependent random access point (DRAP) picture which is different from a first type of DRAP picture is included in the bitstream, and
- wherein the format rule further specifies that the SEI message includes a syntax element indicating a number of intra random access point (IRAP) pictures or second type of DRAP pictures that are within a same coded layer video sequence (CLVS) as the second type of DRAP picture and are allowed to be included in active entries of a reference picture list of the second type of DRAP picture, and
- wherein the first type of DRAP picture is a picture that relies on an IRAP picture and is associated with the first type of SEI message, which is a first DRAP indication SEI message,
- wherein the second type of DRAP picture is a picture that is allowed to rely on an IRAP picture or another DRAP picture and is associated with the second type of SEI message, which is a second DRAP indication SEI message.
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- perform a conversion between visual media data and a bitstream of the visual media data according to a format rule,
- wherein the format rule specifies that a supplemental enhancement information (SEI) message that refers to a second type of dependent random access point (DRAP) picture which is different from a first type of DRAP picture is included in the bitstream, and
- wherein the format rule further specifies that the SEI message includes a syntax element indicating a number of intra random access point (IRAP) pictures or Second type of DRAP pictures that are within a same coded layer video sequence (CLVS) as the second type of DRAP picture and are allowed to be included in active entries of a reference picture list of the second type of DRAP picture, and
- wherein the first type of DRAP picture is a picture that relies on an IRAP picture and is associated with the first type of SEI message, which is a first DRAP indication SEI message,
- wherein the second type of DRAP picture is a picture that is allowed to rely on an IRAP picture or another DRAP picture and is associated with the second type of SEI message, which is a second DRAP indication SEI message.
A non-transitory computer-readable recording medium storing a bitstream of a visual media data which is generated by a method performed by a visual media data processing apparatus, wherein the method comprises:
- determining, based on a format rule, that a supplemental enhancement information (SEI) message that refers to a second type of dependent random access point (DRAP) picture which is different from a first type of DRAP picture is included in the bitstream, wherein the SEI message includes a syntax element indicating a number of intra random access point (IRAP) pictures or second type of DRAP pictures that are within a same coded layer video sequence (CLVS) as the second type of DRAP picture and are allowed to be included in active entries of a reference picture list of the second type of DRAP picture, wherein the first type of DRAP picture is a picture that relies on an IRAP picture and is associated with the first type of SEI message, which is a first DRAP indication SEI message, and wherein the second type of DRAP picture is a picture that is allowed to rely on an IRAP picture or another DRAP picture and is associated with the second type of SEI message, which is a second DRAP indication SEI message;
- and
- generating the bitstream based on the determining.
Dependencies are inferred from the claim text.