Constraint on syntax elements for still picture profiles

1. A method performed by at least one processor, the method comprising:

receiving a bitstream including a sequence parameter set (SPS), the SPS including a flag that specifies whether the bitstream includes only one coded picture;

inferring a value of at least one syntax element of the SPS, based on the flag specifying that the bitstream includes only the one coded picture; and

decoding the one coded picture based on the inferring,

wherein the flag having a first value specifies that the bitstream includes a plurality of coded pictures, and the flag having a second value specifies that the bitstream includes only the one coded picture.

2. The method of claim 1 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element that specifies an ID of a video parameter set.

3. The method of claim 1 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element that specifies a maximum number of temporal sublayers that are allowed to be present in each coded layer video sequence (CLVS) referring to the SPS.

4. The method of claim 1 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a flag that specifies whether a profile, tier, level syntax structure is present in the SPS.

5. The method of claim 1 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to picture order count (POC).

6. The method of claim 1 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to inter slice.

7. The method of claim 1 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to an inter coding tool.

8. The method of claim 1 , further comprising:

inferring a value of at least one syntax element of a picture header of the one coded picture, based on the flag specifying that the bitstream includes only the one coded picture,

wherein the decoding comprises decoding the one coded picture based on the inferring of the value of the at least one syntax element of the SPS and the value of the at least one syntax element of the SPS.

9. The method of claim 8 , wherein the at least one syntax element of the picture header, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a flag that specifies whether a slice type is allowed for the one coded picture.

10. The method of claim 8 , wherein the at least one syntax element of the picture header, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a flag that specifies whether the one coded picture is a reference picture.

11. The method of claim 8 , wherein the at least one syntax element of the picture header, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to a picture order count (POC) or a decoded picture buffer (DPB).

12. A system comprising:

at least one memory storing computer code; and

at least one processor configured to receive a bitstream including a sequence parameter set (SPS), the SPS including a flag that specifies whether the bitstream includes only one coded picture, the at least one processor further configured to access the computer code and operate as instructed by the computer code, the computer code including:

inferring code configured to cause the at least one processor to infer a value of at least one syntax element of the SPS, based on the flag specifying that the bitstream includes only the one coded picture; and

decoding code configured to cause the at least one processor to decode the one coded picture based on inferring the value of the at least one syntax element of the SPS,

wherein the flag having a first value specifies that the bitstream includes a plurality of coded pictures, and the flag having a second value specifies that the bitstream includes only the one coded picture.

13. The system of claim 12 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element that specifies an ID of a video parameter set.

14. The system of claim 12 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element that specifies a maximum number of temporal sublayers that are allowed to be present in each coded layer video sequence (CLVS) referring to the SPS.

15. The system of claim 12 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a flag that specifies whether a profile, tier, level syntax structure is present in the SPS.

16. The system of claim 12 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to picture order count (POC).

17. The system of claim 12 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to inter slice.

18. The system of claim 12 , wherein the at least one syntax element of the SPS, that is inferred based on the flag specifying that the bitstream includes only the one coded picture, includes a syntax element related to an inter coding tool.

19. The system of claim 12 , wherein

the inferring code is further configured the cause the at least one processor to infer a value of at least one syntax element of a picture header of the one coded picture, based on the flag specifying that the bitstream includes only the one coded picture, and

the decoding code is configured the cause the at least one processor to decode the one coded picture based on inferring the value of the at least one syntax element of the SPS and the value of the at least one syntax element of the SPS.

20. A non-transitory computer-readable medium storing computer code that is configured to, when executed by at least one processor, cause the at least one processor to:

infer a value of at least one syntax element of an SPS of a received bitstream, based on a flag of the SPS specifying that the received bitstream includes only one coded picture; and

decode the one coded picture based on inferring the value of the at least one syntax element of the SPS,

wherein the flag having a first value specifies that the bitstream includes a plurality of coded pictures, and the flag having a second value specifies that the bitstream includes only the one coded picture.