1. A method of processing video data, the method comprising:', 'decoding, from a scalable nesting supplemental enhancement information (SEI) message in an encoded video bitstream, a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies.

2. The method of claim 1, further comprising decoding, from the scalable nesting SEI message, a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points.

3. The method of claim 1, wherein the nested SEI message includes a set of hypothetical reference decoder (H D) parameters.

4. The method of claim 1, further comprising decoding, from the scalable nesting SEI message, a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements,

5. The method of claim 1, further comprising decoding, from the scalable nesting SEI message, a syntax element thai indicates the number of operation points to which the nested SEI message applies.

6. The method of claim 1, wherein decoding the plurality of syn tax elements comprises:', 'for at least one respective operation point in the plurality of operation points to which the nested SEI message applies:', 'decoding, from the scalable nesting SEI message, a first syntax element and a second syntax element;', 'determining, based at least in part on the first syntax element, a maximum temporal identifier of the respective operation point; and', 'determining, based at least in pari, on the second syntax element, a set of layer identifiers of the respective operation point.

7. A device comprising one or more processors configured to:', 'decode, from a scalable nesting supplemental enhancement information (SEI) message in an encoded video bitstream, a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies.

8. The device of claim 7, wherein the one or more processors are configured to decode, from the scalable nesting SEI message, a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points,

9. The device of claim 7, wherein the nested SEI message includes a set of hypothetical reference decoder (H D) parameters

10. The device of claim 7, wherein the one or more processors are further configured to decode, from the scalable nesting SEI message, a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements.1. The device of claim 7, wherein the one or more processors are configured to decode, from the scalable nesting SEI message, a syntax element that indicates the number of operation points to which the nested SEI message applies

12. The device of claim 7, wherein the one or more processors are configured such that, for at least one respective operation point in the plurality of operation points to which the nested SEI message applies, the one or more processors:', 'decode, from the scalable nesting SEI message, a first syntax element and a second syntax element;', 'determine, based at least in part on the first syntax element, a. maximum temporal identifier of the respective operation point; and', 'determine, based at least in part on the second syntax element, a set of layer identifiers of the respective operation point

13. A device comprising:', 'means for decoding, from a scalable nesting supplemental enhancement information (SEI) message in an encoded video bitstream, a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies

14. The device of claim 13, further comprising:', 'means for decoding, from the scalable nesting SEI message, a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points; and', 'means for decoding, from the scalable nesting SEI message, a syntax element that indicates the number of operation points to which the nested SEI message applies,15. The device of claim 13, further comprising means for decoding, from the scalable nesting SEI message, a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements

16. A computer-readable storage medium that stores instructions that, when executed by a device, configure the device to:', 'decode, from a scalable nesting supplemental enhancement information (SEI) message in an encoded video bitstream, a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies

17. The computer-readable s torage medium of claim 16, wherein the instructions further configure the device to:', 'decode, from the scalable nesting SEI message, a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points; and', 'decode, from the scalable nesting SEI message, a syntax element that indicates the number of operation points to which the nested SEI message applies

18. The computer-readable storage medium of claim 16, wrherein the instructions further configure the device to decode, from the scalable nesting SEI message, a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements

19. A method for encoding video data, the method comprising:', 'generating a scalable nesting supplemental enhancement information (SEI) message that includes a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies; and', 'signaling the scalable nesting SET message in an encoded video bitstream.

20. The method of claim 19, wherein the scalable nesting SEI message includes a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points.

21. The method of claim 19, wherein the nested SET message Includes a set of hypothetical reference decoder (HRD) parameters,

22. The method of claim 19, further comprising including, in the scalable nesting SET message, a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements,

23. The method of claim 19, further comprising including, in the scalable nesting SEI message, a syntax element that indicates the number of operation points to which the nested SEI message applies.

24. The method of claim 19, wherein generating the scalable nesting SEI message comprises for at least one respective operation point in the plurality of operation points to which the nested SEI message applies including, in the scalable nesting SEI message, a first syntax element and a second syntax element, the first syntax element indicating a maximum temporal identifier of the respective operation point, and the second syntax element indicating a set of layer identifiers of the respective operation point.

25. A video encoding device comprising one or more processors configured to: generate a scalable nesting supplemental enhancement information (SEI) message that includes a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies; and', 'signal the scalable nesting SEI message in an encoded video bitstream.

26. The video encoding device of claim 25, wherein the scalable nesting SEI message includes a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points.

27. The video encoding device of claim 25, wherein the nested SEI message includes a set of hypothetical reference decoder (HRD) parameters.

28. The video encoding device of claim 25, wherein the one or more processors are configured to include, in the scalable nesting SEI message, a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements.

29. The video encoding device of claim 25, wherein the one or more processors are configured to include, in the scalable nesting SEI message, a syntax element that indicates the number of operation points to which the nested SEI message applies.

30. The video encoding device of claim 25, wherein the one or more processors are configured such that, for at least one respective operation point in the plurality of operation points to which the nested SEI message applies, the one or more processors include, in the scalable nesting SEI message, a first syntax element and a second syntax element, the first syntax element indicating a maximum temporal identifier of the respective operation point, and the second syntax element indicating a set of layer identifiers of the respective operation point.

31. A video encoding device comprising:', 'means for generating a scalable nesting supplemental enhancement information (SEI) message that includes a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies; and', 'means for signaling the scalable nesting SEI message in an encoded video bitstream.

32. The video encoding device of claim 31 , wherein the scalable nesting SEI message includes a. syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points, and the scalable nesting SEI message includes a syntax element that indicates the number of operation points to which the nested SEI message applies.

33. The video encoding device of claim 31, wherein the scalable nesting SEI message includes a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements.

34. A computer-readable storage medium that stores instructions that, when executed by a video encoding device, configure the video encoding device to:', 'generate a scalable nesting supplemental enhancement information (SEI) message that includes a plurality of syntax elements that identify a plurality of operation points to which a nested SEI message encapsulated by the scalable nesting SEI message applies; and', 'signal the scalable nesting SEI message in an encoded video bitstream.

35. The computer-readable storage medium of claim 34, wherein the scalable nesting SEI message includes a syntax element indicating whether the scalable nesting SEI message includes the plurality of syntax elements that identify the operation points, and the scalable nesting SEI message includes a syntax element that indicates the number of operation points to which the nested SEI message applies.

36. The computer-readable storage medium of claim 34, wherein the scalable nesting SEI message includes a plurality of nested SEI messages encapsulated by the scalable nesting SEI message, wherein each of the nested SEI messages is applicable to all of the operation points identified by the plurality of syntax elements.']