1. A method of presenting video data, the method comprising:', 'determining an integer value for the video data;', 'determining a difference value between a presentation time of a first picture and a presentation time of a second picture, wherein the difference value is equal to the integer value multiplied by a clock tick value; and', 'presenting the first picture and the second picture according to the determined difference value.

2. The method of claim 1, further comprising determining that a temporal layer including the first picture and the second picture has a constant picture rate, wherein determining the integer value comprises, based on the determination that the temporal layer has the constant picture rate, decoding data defining the integer value.

3. The method of claim 2, wherein determining that the temporal layer has the constant picture rate comprises determining that a fixed_pic_rate_flag has a value indicating that the temporal layer has the constant picture rate.

4. The method of claim 2, further comprising:', 'determining, for each temporal layer having a respective constant picture rate, an individually signaled integer value; and', 'presenting pictures of each of the temporal layers having respective constant picture rates according to respective integer values multiplied by the clock tick value and differences between presentation times of the pictures.

5. The method of claim 1, wherein determining the clock tick value comprises determining a time scale value.

6. The method of claim 1 , wherein the first picture and the second picture are included in a highest temporal layer, the method further comprising:', 'determining a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value; and', 'presenting pictures of the lower temporal layer based on the second difference value.

7. The method of claim 1 , wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.

8. A device for presenting video data, the device comprising a processor configured to determine an integer value for the video data, determine a difference value between a presentation time of a first picture and a presentation time of a second picture, wherein the difference value is equal to the integer value multiplied by a clock tick value, and present the first picture and the second picture according to the determined difference value.

9. The device of claim 8, wherein to determine the integer value, the processor is configured to determine that a temporal layer including the first picture and the second picture has a constant picture rate, and, based on the determination that the temporal layer has the constant picture rate, decode data defining the integer value

10. The device of claim 9, wherein the processor is configured to determine that a fixed_pic_rate_flag has a value indicating that the temporal layer has the constant picture rate

11. The device of claim 9, wherein the processor is further configured to determine, for each temporal layer having a respective constant picture rate, an individually signaled integer value, and present pictures of each of the temporal layers having respective constant picture rates according to respective integer values multiplied by the clock tick value and differences between presentation times of the pictures

12. The device of claim 8, wherein the first picture and the second picture are included in a highest temporal layer, and wherein the processor is further configured to determine a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value, and present pictures of the lower temporal layer based on the second difference value

13. The device of claim 8, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value

14. A device for presenting video data, the device comprising:', 'means for determining an integer value for the video data;', 'means for determining a difference value between a presentation time of a first picture and a presentation time of a second picture, wherein the difference value is equal to an integer value multiplied by a clock tick value; and', 'means for presenting the first picture and the second picture according to the determined difference value

15. The device of claim 14, further comprising means for determining that a temporal layer including the first picture and the second picture has a constant picture rate, wherein the means for determining the integer value comprise means for decoding, based on the determination that the temporal layer has the constant picture rate, data defining the integer value

16. The device of claim 15, wherein the means for determining that the temporal layer has the constant picture rate comprises means for determining that a', 'fixed_pic_rate_flag has a value indicating that the temporal layer has the constant picture rate

17. The device of claim 15, further comprising:', 'means for determining, for each temporal layer having a respective constant picture rate, an individually signaled integer value; and', 'means for presenting pictures of each of the temporal layers having respective constant picture rates according to respective integer values multiplied by the clock tick value and differences between presentation times of the pictures

18. The device of claim 14, wherein the first picture and the second picture are included in a highest temporal layer, the device further comprising:', 'means for determining a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value; and means for presenting pictures of the lower temporal layer based on the second difference value

19. The device of claim 14, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.

20. A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to:', 'determine an integer value for the video data', 'determine a difference value between a presentation time of a first picture and a presentation time of a second picture, wherein the difference value is equal to the integer value multiplied by a clock tick value; and', 'present the first picture and the second picture according to the determined difference value.

21. The computer-readable storage medium of claim 20, further comprising instructions that cause the processor to determine that a temporal layer including the first picture and the second picture has a constant picture rate, wherein the instructions that cause the processor to determine the integer value comprise instructions that cause the processor to decode, based on the determination that the temporal layer has the constant picture rate, data defining the integer value.

22. The computer-readable storage medium of claim 21, wherein determining that the temporal layer has the constant picture rate comprises determining that a', 'fixed_pic_rate_flag has a value indicating that the temporal layer has the constant picture rate.

23. The computer-readable storage medium of claim 21, further comprising instructions that cause the processor to:', 'determine, for each temporal layer having a respective constant picture rate, an individually signaled integer value; and', 'present pictures of each of the temporal layers having respective constant picture rates according to respective integer values multiplied by the clock tick value and differences between presentation times of the pictures.

24. The computer-readable storage medium of claim 20, wherein the first picture and the second picture are included in a highest temporal layer, further comprising instructions that cause the processor to:', 'determine a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value; and', 'present pictures of the lower temporal layer based on the second difference value.

25. The computer-readable storage medium of claim 20, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.

26. A method of generating a bitstream including video data, the method comprising:', 'generating data indicating whether a difference between a presentation time of a first picture and a presentation time of a second picture is an integer multiple of a clock tick value; and', 'when the data indicates that the difference is the integer multiple of the clock tick value, generating data representative of the integer multiple.

27. The method of claim 26, further comprising determining that a temporal layer including the first picture and the second picture has a constant picture rate, wherein generating the data indicating whether the difference is the integer multiple comprises generating the data to indicate that the difference is the integer multiple based on the determination that the temporal layer has the constant picture rate.

28. The method of claim 27, wherein generating the data indicating whether the difference is the integer multiple comprises generating a fixed_pic_rate_f ag syntax element.

29. The method of claim 27, further comprising:', 'determining respective constant picture rates for various temporal layers; and signaling, for each of the temporal layers, data representative of the respective constant picture rates.

30. The method of claim 26, wherein the first picture and the second picture are included in a highest temporal layer, the method further comprising:', 'determining a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value; and', 'generating data representative of the second integer value.

31. The method of claim 26, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.

32. A device for generating a bitstream including video data, the device comprising a processor configured to generate data indicating whether a difference between a presentation time of a first picture and a presentation time of a second picture is an integer multiple of a clock tick value, and, when the data indicates that the difference is the integer multiple of the clock tick value, generate data representative of the integer multiple.

33. The device of claim 32, wherein the processor is further configured to determine that a temporal layer including the first picture and the second picture has a constant picture rate, and wherein the processor is configured to generate the data to indicate that the difference is the integer multiple based on the determination that the temporal layer has the constant picture rate.

34. The device of claim 33, wherein to generate the data indicating whether the difference is the integer multiple, the processor is configured to generate a value for a fixed_pic_rate_flag syntax element.

35. The device of claim 33, wherein the processor is further configured to determine respective constant picture rates for various temporal layers, and signal, for each of the temporal layers, data representative of the respective constant picture rates.

36. The device of claim 32, wherein the first picture and the second picture are included in a highest temporal layer, and wherein the processor is further configured to determine a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value, and generate data representative of the second integer value.

37. The device of claim 32, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.

38. A device for generating a bitstream including video data, the device comprising: means for generating data indicating whether a difference between a', 'presentation time of a first picture and a presentation time of a second picture is an integer multiple of a clock tick value; and', 'means for generating, when the data indicates that the difference is the integer multiple of the clock tick value, data representative of the integer multiple.

39. The device of claim 38, further comprising means for determining that a temporal layer including the first picture and the second picture has a constant picture rate, wherein generating the data indicating whether the difference is the integer multiple comprises generating the data to indicate that the difference is the integer multiple based on the determination that the temporal layer has the constant picture rate.

40. The device of claim 39, wherein the means for generating the data indicating whether the difference is the integer multiple comprises means for generating a fixed_pic_rate_flag syntax element.

41. The device of claim 39, further comprising:', 'means for determining respective constant picture rates for various temporal layers; and', 'means for signaling, for each of the temporal layers, data representative of the respective constant picture rates.

42. The device of claim 38, wherein the first picture and the second picture are included in a highest temporal layer, further comprising:', 'means for determining a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value; and means for generating data representative of the second integer value.

43. The device of claim 38, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.

44. A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to:', 'generate data indicating whether a difference between a presentation time of a first picture and a presentation time of a second picture is an integer multiple of a clock tick value; and', 'when the data indicates that the difference is the integer multiple of the clock tick value, generate data representative of the integer multiple.

45. The computer-readable storage medium of claim 44, further comprising instructions that cause the processor to determine that a temporal layer including the first picture and the second picture has a constant picture rate, wherein the instructions that cause the processor to generate the data indicating whether the difference is the integer multiple comprise instructions that cause the processor to generate the data to indicate that the difference is the integer multiple based on the determination that the temporal layer has the constant picture rate.

46. The computer-readable storage medium of claim 45, wherein the instructions that cause the processor to generate the data indicating whether the difference is the integer multiple comprise instructions that cause the processor to generate a fixed_pic_rate_flag syntax element.

47. The computer-readable storage medium of claim 45, further comprising instructions that cause the processor to:', 'determine respective constant picture rates for various temporal layers; and signal, for each of the temporal layers, data representative of the respective constant picture rates.

48. The computer-readable storage medium of claim 44, wherein the first picture and the second picture are included in a highest temporal layer, further comprising instructions that cause the processor to:', 'determine a second difference value between a presentation time of a third picture and a presentation time of a fourth picture in a lower temporal layer based on a temporal layer identification value associated with the highest temporal layer, a second integer value for the lower temporal layer, and the clock tick value; and', 'generate data representative of the second integer value.

49. The computer-readable storage medium of claim 44, wherein the presentation time for the first picture comprises a first picture order count (POC) value, and wherein the presentation time for the second picture comprises a second POC value.']