METHODS AND SYSTEMS FOR PICTURE RATE REDUCTION OF STORED VIDEO WHILE UNDER CONTINUOUS RECORD LOAD

Abstract

Provided is a method and system for splitting a video stream into X minute video segments and further dividing those video segments into M multiplex files. Each multiplex file can have a Time to Live (TTL). This allows for part of the video to be deleted from disk by just removing a single multiplex file. The remaining multiplex files can be combined to play back the video at a reduced sample rate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments and together with the description, serve to explain the principles of the methods and systems:

FIG. 1 illustrates steps in an exemplary method of generating a sequence guide;

FIG. 2 illustrates steps in an exemplary method of storing a video stream;

FIG. 3 illustrates steps in an exemplary method of storing a video stream;

FIG. 4 illustrates construction of an exemplary sequence guide;

FIG. 5 illustrates an exemplary operating environment; and

FIG. 6 illustrates an exemplary operating environment.

Claims

1. A method for post frame rate reduction comprising: receiving a video segment;detecting a picture boundary, indicating a picture, in the video segment; andadding the picture to one of a plurality of files based on a sequence guide and a frame sequence constraint, wherein each file has an associated time to live.

2. The method of claim 1, wherein the frame sequence constraint comprises that each picture is added to the next file indicated in the sequence guide.

3. The method of claim 1, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture and the first file has the smallest associated time to live of the plurality of files.

4. The method of claim 1, wherein the frame sequence constraint comprises that the first picture added to a first file must be a combined B and P picture and the first file has the smallest associated time to live of the plurality of files.

5. The method of claim 1, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture, then a P picture in a second file, then an I picture must be added to the remaining files.

6. The method of claim 1, wherein the plurality of files comprises six files.

7. A method for post frame rate reduction comprising: receiving a video stream;separating the video stream into a plurality of video segments;generating a plurality of sets of files, each set of files associated with a video segment, wherein each file has an associated time to live;detecting a picture boundary, indicating a picture, in a video segment; andadding the picture to one of the files in the set of files associated with the video segment based on a sequence guide and a frame sequence constraint.

8. The method of claim 7, wherein the frame sequence constraint comprises that each picture is added to the next file indicated in the sequence guide.

9. The method of claim 7, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture and the first file has the smallest associated time to live of the plurality of files.

10. The method of claim 7, wherein the frame sequence constraint comprises that the first picture added to a first file must be a combined B and P picture and the first file has the smallest associated time to live of the plurality of files.

11. The method of claim 7, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture, then a P picture in a second file, then an I picture must be added to the remaining files.

12. The method of claim 7, wherein the video stream is an M-JPEG stream.

13. The method of claim 7, wherein the video stream is an MPEG stream.

14. A method for generating a sequence guide comprising: determining a plurality of files to divide a video segment into;determining a sequence guide length;generating an empty sequence guide; andgenerating a complete sequence guide following a frame sequence guide constraint.

15. The method of claim 14, wherein each file has an associated time to live.

16. A method for playback of a video stream comprising: receiving a request for a desired frame rate;determining a plurality of files required to provide the desired frame rate;determining which of the plurality of files required has not exceeded an associated time to live; andde-multiplexing the plurality of files that have not exceeded an associated time to live into a video stream with the desired frame rate.

17. The method of claim 16 further comprising: displaying the video stream.

18. The method of claim 16 further comprising: up-sampling a portion of the video stream to the requested frame rate.

19. The method of claim 18, wherein the video stream is an MPEG stream and up-sampling comprises substituting a missing video picture with an identity P picture.

20. A method for playback of a video stream comprising opening a plurality of files corresponding to a first video segment, according to a sequence guide;reading the files in the order of the sequence guide; andde-multiplexing the files into a video stream with a desired frame rate

21. The method of claim 20 further comprising: displaying the video stream.

22. The method of claim 20, wherein a PDU Header is used to maintain synchronization while reading from a file.

23. The method of claim 20, wherein a PDU Header is used to detect out of sequence pictures.

24. A computer readable medium with computer executable instructions embodied thereon for post frame rate reduction comprising: receiving a video segment;detecting a picture boundary, indicating a picture, in the video segment; andadding the picture to one of a plurality of files based on a sequence guide and a frame sequence constraint, wherein each file has an associated time to live.

25. The computer readable medium of claim 24, wherein the frame sequence constraint comprises that each picture is added to the next file indicated in the sequence guide.

26. The computer readable medium of claim 24, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture and the first file has the smallest associated time to live of the plurality of files.

27. The computer readable medium of claim 24, wherein the frame sequence constraint comprises that the first picture added to a first file must be a combined B and P picture and the first file has the smallest associated time to live of the plurality of files.

28. The computer readable medium of claim 24, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture, then a P picture in a second file, then an I picture must be added to the remaining files.

29. The computer readable medium of claim 24, wherein the plurality of files comprises six files.

30. A computer readable medium with computer executable instructions embodied thereon for post frame rate reduction comprising: receiving a video stream;separating the video stream into a plurality of video segments;generating a plurality of sets of files, each set of files associated with a video segment wherein each file has an associated time to live;detecting a picture boundary, indicating a picture, in a video segment; and adding the picture to one of the files in the set of files associated with the video segment based on a sequence guide and a frame sequence constraint.

31. The computer readable medium of claim 30, wherein the frame sequence constraint comprises that each picture is added to the next file indicated in the sequence guide.

32. The computer readable medium of claim 30, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture and the first file has the smallest associated time to live of the plurality of files.

33. The computer readable medium of claim 30, wherein the frame sequence constraint comprises that the first picture added to a first file must be a combined B and P picture and the first file has the smallest associated time to live of the plurality of files.

34. The computer readable medium of claim 30, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture, then a P picture in a second file, then an I picture must be added to the remaining files.

35. The computer readable medium of claim 30, wherein the video stream is an M-JPEG stream.

36. The computer readable medium of claim 30, wherein the video stream is an MPEG stream.

37. A computer readable medium with computer executable instructions embodied thereon for generating a sequence guide comprising: determining a plurality of files to divide a video segment into;determining a sequence guide length;generating an empty sequence guide; andgenerating a complete sequence guide following a frame sequence guide constraint.

38. The computer readable medium of claim 37, wherein each file has an associated time to live.

39. A computer readable medium with computer executable instructions embodied thereon for playback of a video stream comprising: receiving a request for a desired frame rate;determining a plurality of files required to provide the desired frame rate;determining which of the plurality of files required has not exceeded an associated time to live; andde-multiplexing the plurality of files that have not exceed an associated time to live into a video stream with the desired frame rate.

40. The computer readable medium of claim 39, further comprising: displaying the video stream.

41. The computer readable medium of claim 39 further comprising: up-sampling a portion of the video stream to the requested frame rate.

42. The computer readable medium of claim 41, wherein the video stream is an MPEG stream and up-sampling comprises substituting a missing video picture with an identity P picture.

43. A computer readable medium for playback of a video stream comprising opening a plurality of files corresponding to a first video segment, according to a sequence guide;reading the files in the order of the sequence guide; andde-multiplexing the files into a video stream with a desired frame rate

44. The computer readable medium of claim 43 further comprising: displaying the video stream.

45. The computer readable medium of claim 43, wherein a PDU Header is used to maintain synchronization while reading from a file.

46. A system for post frame rate reduction comprising: a video input device;a memory, coupled to the video input device and configured for storing video;a processor, coupled to the memory, wherein the processor is configured for performing the steps of: receiving a video segment;detecting a picture boundary, indicating a picture, in the video segment; andadding the picture to one of a plurality of files based on a sequence guide and a frame sequence constraint wherein each file has an associated time to live.

47. The system of claim 46, wherein the frame sequence constraint comprises that each picture is added to the next file indicated in the sequence guide.

48. The system of claim 46, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture and the first file has the smallest associated time to live of the plurality of files.

49. The system of claim 46, wherein the frame sequence constraint comprises that the first picture added to a first file must be a combined B and P picture and the first file has the smallest associated time to live of the plurality of files.

50. The system of claim 46, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture, then a P picture in a second file, then an I picture must be added to the remaining files.

51. The system of claim 46, wherein the plurality of files comprises six files.

52. A system for post frame rate reduction comprising: a video input device;a memory, coupled to the video input device and configured for storing video;a processor, coupled to the memory, wherein the processor is configured for performing the steps of: receiving a video stream;separating the video stream into a plurality of video segments;generating a plurality of sets of files, each set of files associated with a video segment wherein each file has an associated time to live;detecting a picture boundary, indicating a picture, in a video segment; and adding the picture to one of the files in the set of files associated with the video segment based on a sequence guide and a frame sequence constraint.

53. The system of claim 52, wherein the frame sequence constraint comprises that each picture is added to the next file indicated in the sequence guide.

54. The system of claim 52, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture and the first file has the smallest associated time to live of the plurality of files.

55. The system of claim 52, wherein the frame sequence constraint comprises that the first picture added to a first file must be a combined B and P picture and the first file has the smallest associated time to live of the plurality of files.

56. The system of claim 52, wherein the frame sequence constraint comprises that the first picture added to a first file must be a B picture, then a P picture in a second file, then an I picture must be added to the remaining files.

57. The system of claim 52, wherein the video stream is an M-JPEG stream.

58. The system of claim 52, wherein the video stream is an MPEG stream.

59. A system for generating a sequence guide comprising: a memory configured for storing video;a processor, coupled to the memory, wherein the processor is configured for performing the steps of: determining a plurality of files to divide a video segment into;determining a sequence guide length;generating an empty sequence guide; andgenerating a complete sequence guide following a frame sequence guide constraint.

60. The system of claim 59, wherein each file has an associated time to live.

61. A system for playback of a video stream comprising: a display device;a memory, coupled to the display device and configured for storing video;a processor, coupled to the memory, wherein the processor is configured for performing the steps of: receiving a request for a desired frame rate;determining a plurality of files required to provide the desired frame rate;determining which of the plurality of files required has not exceeded an associated time to live; andde-multiplexing the plurality of files that have not exceed an associated time to live into a video stream with the desired frame rate.

62. The system of claim 61 further comprising: displaying the video stream.

63. The system of claim 61 further comprising: up-sampling a portion of the video stream to the requested frame rate.

64. The system of claim 63, wherein the video stream is an MPEG stream and up-sampling comprises substituting a missing video picture with an identity P picture.

65. A system for playback of a video stream comprising a display device;a memory, coupled to the display device and configured for storing video;a processor, coupled to the memory, wherein the processor is configured for performing the steps of: opening a plurality of files corresponding to a first video segment, according to a sequence guide;reading the files in the order of the sequence guide; andde-multiplexing the files into a video stream with a desired frame rate

66. The system of claim 65 further comprising: displaying the video stream.

67. The system of claim 65, wherein a PDU Header is used to maintain synchronization while reading from a file.

68. The system of claim 65, wherein a PDU Header is used to detect out of sequence pictures.