Picture timing information signaling in coded video
Examples of video encoding methods and apparatus and video decoding methods and apparatus are described. An example method of video processing includes performing a conversion between a video and a bitstream of the video comprising one or more output layer sets according to a rule, wherein the rule specifies that a supplemental enhancement information (SEI) network abstraction layer (NAL) unit that includes a scalable-nested SEI message carrying picture timing information is not included due to use of a same picture timing in all output layer sets in the bitstream.
1. A method of processing video data, comprising:
performing a conversion between a video and a bitstream of the video comprising one or more output layer sets according to a rule,
wherein the rule specifies that a supplemental enhancement information (SEI) network abstraction layer (NAL) unit that includes a scalable-nested SEI message with a payload type of picture timing (PT) is not included when a flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1,
wherein the rule further specifies that a non-scalable-nested hypothetical reference decoder (HRD)-related supplemental enhancement information (SEI) message is omitted responsive to a condition that there does not exist an output layer set that includes video layers as the bitstream, and
wherein the rule further specifies that a particular payload type value corresponding to subpicture level information is disallowed from VclAssociatedSeiList that is a list including one or more supplemental enhancement information (SEI) payload type values.
2. The method of claim 1 , wherein the scalable-nested SEI message with the payload type of PT carries picture timing information.
3. The method of claim 1 , wherein the scalable-nested SEI message with the payload type of PT has a payload type equal to 1.
4. The method of claim 1 , wherein the rule further specifies that when the flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1, same picture timing in all output layer sets is used.
5. The method of claim 4 , wherein the rule further specifies that when the flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1, non-scalable-nested SEI messages with the payload type of PT apply to all output layer sets.
6. The method of claim 1 , wherein the conversion includes encoding the video into the bitstream.
7. The method of claim 1 , wherein the conversion includes decoding the video from the bitstream.
8. An apparatus for processing video 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 a video and a bitstream of the video comprising one or more output layer sets according to a rule,
wherein the rule specifies that a supplemental enhancement information (SEI) network abstraction layer (NAL) unit that includes a scalable-nested SEI message with a payload type of picture timing (PT) is not included when a flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1,
wherein the rule further specifies that a non-scalable-nested hypothetical reference decoder (HRD)-related supplemental enhancement information (SEI) message is omitted responsive to a condition that there does not exist an output layer set that includes video layers as the bitstream, and
wherein the rule further specifies that a particular payload type value corresponding to subpicture level information is disallowed from VclAssociatedSeiList that is a list including one or more supplemental enhancement information (SEI) payload type values.
9. The apparatus of claim 8 , wherein the scalable-nested SEI message with the payload type of PT carries picture timing information.
10. The apparatus of claim 8 , wherein the scalable-nested SEI message with the payload type of PT has a payload type equal to 1.
11. The apparatus of claim 8 , wherein the rule further specifies that when the flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1, same picture timing in all output layer sets is used.
12. The apparatus of claim 11 , wherein the rule further specifies that when the flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1, non-scalable-nested SEI messages with the payload type of PT apply to all output layer sets.
13. A non-transitory computer-readable storage medium storing instructions that cause a processor to:
perform a conversion between a video and a bitstream of the video comprising one or more output layer sets according to a rule,
wherein the rule specifies that a supplemental enhancement information (SEI) network abstraction layer (NAL) unit that includes a scalable-nested SEI message with a payload type of picture timing (PT) is not included when a flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1,
wherein the rule further specifies that a non-scalable-nested hypothetical reference decoder (HRD)-related supplemental enhancement information (SEI) message is omitted responsive to a condition that there does not exist an output layer set that includes video layers as the bitstream, and wherein the rule further specifies that a particular payload type value corresponding to subpicture level information is disallowed from VclAssociatedSeiList that is a list including one or more supplemental enhancement information (SEI) payload type values.
14. The non-transitory computer-readable storage medium of claim 13 , wherein the scalable-nested SEI message with the payload type of PT carries picture timing information, and wherein the scalable-nested SEI message with the payload type of PT has a payload type equal to 1.
15. The non-transitory computer-readable storage medium of claim 13 , wherein the rule further specifies that when the flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1, same picture timing in all output layer sets is used, and non-scalable-nested SEI messages with the payload type of PT apply to all output layer sets.
16. A method for storing a bitstream of a video, wherein the method comprises:
generating the bitstream of the video comprising one or more output layer sets according to a rule, and
storing the bitstream in a non-transitory computer-readable recording medium,
wherein the rule specifies that a supplemental enhancement information (SEI) network abstraction layer (NAL) unit that includes a scalable-nested SEI message with a payload type of picture timing (PT) is not included when a flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1,
wherein the rule further specifies that a non-scalable-nested hypothetical reference decoder (HRD)-related supplemental enhancement information (SEI) message is omitted responsive to a condition that there does not exist an output layer set that includes video layers as the bitstream, and
wherein the rule further specifies that a particular payload type value corresponding to subpicture level information is disallowed from VclAssociatedSeiList that is a list including one or more supplemental enhancement information (SEI) payload type values.
17. The non-transitory computer-readable recording medium of claim 16 , wherein the scalable-nested SEI message with the payload type of PT carries picture timing information, and wherein the scalable-nested SEI message with the payload type of PT has a payload type equal to 1.
18. The non-transitory computer-readable recording medium of claim 16 , wherein the rule further specifies that when the flag included in the bitstream named general_same_pic_timing_in_all_ols_flag has a value of 1, same picture timing in all output layer sets is used, and non-scalable-nested SEI messages with the payload type of PT apply to all output layer sets.
19. The method of claim 1 , wherein the one or more SEI payload type values include 3, 19, 45, 129, 137, 144, 145, 147 to 150, 153 to 156, 168, and 204.
20. The method of claim 1 , wherein the particular payload type value is 203.