Optimizing trick modes for streaming media content

• US 20070058926A1
• Filed: 09/09/2005
• Published: 03/15/2007
• Est. Priority Date: 09/09/2005
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Bowra, Todd, Virdi, Gurpratap, Davis, Jeffrey
• Application Number:
  US11/222,691
• Publication Number:
  US 20070058926A1
• Time in Patent Office: Days
• US Class Current: 386/231
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/47202 for requesting content on demand, e.g. video on demand
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 7/163 by receiver means only
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

While streaming media content, trick mode operation is optimized to a level that can be readily accommodated by available resources of a media delivery system. In one possible strategy, a trick mode optimization module may decrease the bit rate of the media content stream by progressively dropping delta frames and then a fraction of the remaining key frames as needed. According to another possible strategy, the trick mode optimization module may decrease the bit rate of the media content by progressively dropping sequences of frames between successive key frames. In addition, the trick mode optimization module may combine strategies and drop sequences between key frames, as well as dropping delta frames from the remaining sequences.

Claims

1. A method, implementable by a computer system, comprising:

monitoring a current state of a media delivery system while media content is being streamed over the media delivery system at a trick mode bit rate;

detecting in the media delivery system a resource which cannot accommodate the trick mode bit rate;

removing selected portions of the media content prior to the media content reaching the resource to reduce the trick mode bit rate to a reduced bit rate that can be accommodated by the resource.

2. The method of claim 1, wherein said monitoring comprises at least one of reviewing data regarding at least one of capabilities and available resources of a CPU, reviewing data regarding at least one of capabilities and available resources of a GPU, reviewing data regarding at least one of capabilities and available resources of media system memory, reviewing data regarding at least one of capabilities and available resources of a hard disk on a PC, reviewing data regarding at least one of capabilities and available resources of an I/O interface, reviewing data regarding at least one of capabilities and available resources of an I/O interface hard disk, reviewing data regarding at least one of capabilities and available resources of a decoder, reviewing data regarding at least one of capabilities and available resources of a buffer, reviewing data regarding at least one of capabilities and available resources of a bus, and reviewing data regarding at least one of capabilities and available resources of a network.

3. The method of claim 1, wherein a trick mode comprises one of rewinding the media content and fast forwarding the media content.

4. The method of claim 1, wherein the media content is formatted according to at least one format from a group of formats comprising MPEG 1, MPEG 2, MPEG 4, and WMV.

5. The method of claim 1, wherein removing selected portions from the media content being streamed comprises dropping one of delta frames, key frames, B-frames, P-frames, and I-frames from the media content.

6. The method of claim 1, wherein removing selected portions from the media content being streamed comprises eliminating selected frame sequences between key frames from the media content.

7. The method of claim 1, further comprising discontinuing removing frames from the media content once a trick mode is deactivated.

8. The method of claim 1, wherein if the media content has bi-directionally predicted frames, removing selected portions of the media content being streamed comprises iteratively removing a selection of B-frames,

in the event that the removal of the selection of B-frames does not reduce the trick mode bit rate to a bit rate that can be accommodated by the resource, or if the media content does not have bi-directionally predicted frames, removing a selection of P-frames, and

in the event that the removal of the selection of P-frames does not reduce the trick mode bit rate to a bit rate that can be accommodated by the resource, removing a selection of I-frames.

9. A server comprising:

a processor; and

a trick mode optimization module executable on the processor to ascertain a target bit rate that resources used to stream media content can accommodate when the media content is streamed in a trick mode, and to selectively remove portions of the media content when streamed in the trick mode to decrease the bit rate of the streaming media content to the target bit rate.

10. The server of claim 9, wherein the server is one of a home PC, an access point, and a set top box.

11. The server of claim 9, wherein the trick mode optimization module ascertains the target bit rate by reviewing resource capability and availability information from resources comprising at least one of a CPU, a GPU, a network, a computer'"'"'s memory, a computer'"'"'s hard disk, an I/O interface, an I/O interface hard disk, a decoder, a buffer, and a bus.

12. The server of claim 9, wherein the trick mode optimization module resides in an operating system.

13. A computer-readable storage medium having computer-readable instructions that, when executed, perform acts comprising:

identifying a resource in a media delivery system which cannot accommodate media content being streamed at a trick mode bit rate by the media delivery system; and

deleting selected portions of the media content to decrease the trick mode bit rate to a bit rate that can be accommodated by the resource.

14. A media delivery system comprising at least one server utilizing the computer-readable instructions of claim 13 to facilitate the delivery of media content during a trick mode while avoiding creation of a bottleneck at a resource.

15. The computer-readable storage medium of claim 13, wherein said identifying comprises collecting information regarding one of capability and availability concerning the resource, and comparing the one of capability and availability information against the trick mode bit rate.

16. The computer-readable storage medium of claim 15, wherein said collecting further comprises obtaining data on one of capability and availability of one of:

a CPU, a GPU, a network, a computer'"'"'s memory, a hard disk, an I/O interface hard disk, an I/O interface, a decoder, a buffer, and a bus.

17. The computer-readable storage medium of claim 13, wherein if the media content has bi-directionally predicted frames, deleting selected portions of the media content comprises deleting a selection of B-frames,

in the event that the deletion of the selection of B-frames does not reduce the trick mode bit rate to a bit rate that can be accommodated by the resource, or if the media content does not have bi-directionally predicted frames, deleting a selection of P-frames, and

in the event that the removal of the selection of P-frames does not reduce the trick mode bit rate to a bit rate that can be accommodated by the resource, deleting a selection of I-frames.

18. The computer-readable storage medium of claim 13, wherein removing frames from the media content being streamed comprises removing select frame sequences between the I-frames from the media content.

19. An operating system comprising the computer-readable instructions of claim 13.

20. An entertainment device comprising a processor and the computer readable storage medium of claim 13, wherein the computer-readable instructions are implemented on the processor.