Methods and systems for seeking to non-key frames

• US 9,520,155 B2
• Filed: 12/24/2013
• Issued: 12/13/2016
• Est. Priority Date: 12/24/2013
• Status: Active Grant

• Current Assignee: JBF Interlude 2009 Ltd.
• Original Assignee: JBF Interlude 2009 Ltd.
• Inventors: Zubalsky, Tal, Bloch, Jonathan, Feldman, Barak, Hofshy, Yuval, Lahav, Tomer
• Primary Examiner(s): Shibru, Helen
• Application Number:
  US14/140,007
• Publication Number:
  US 20150179224A1
• Time in Patent Office: 1,085 Days
• Field of Search: 386/241
• US Class Current: 1/1
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: H04N 19/107 between spatial and temporal predictive coding, e.g. picture refresh
• CPC Class Codes: H04N 21/234381 by altering the temporal resolution, e.g. decreasing the frame rate by frame skipping
• CPC Class Codes: H04N 21/2387 Stream processing in response to a playback request from an end-user, e.g. for trick-play
• CPC Class Codes: H04N 21/6587 Control parameters, e.g. trick play commands, viewpoint selection
• CPC Class Codes: H04N 5/76 Television signal recording
• CPC Class Codes: H04N 5/93 Regeneration of the television signal or of selected parts thereof
• CPC Class Codes: H04N 7/17336 Handling of requests in head-ends
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

Methods and systems for seeking to a non-key frame in a compressed video. The compressed video has a plurality of frames, each with a playback timestamp. At least one of the frames is a key frame. A selection of a non-key frame is received, and a temporally proximate key frame is identified. The set of frames between the identified key frame and the selected frame is played in a reduced time interval, and the selected frame is displayed as if it were a key frame.

Claims

1. A computer-implemented method comprising:

receiving a selection of a frame in a compressed video that is not a key frame, the compressed video comprising a plurality of frames, each frame comprising a playback timestamp, at least one of the frames comprising a key frame;

identifying a key frame in the compressed video that is temporally proximate to the selected frame;

playing a set of frames comprising all of the frames between the identified key frame and the selected frame, wherein the playing of the set of frames is performed in a reduced time interval relative to a normal playback time interval of the set of frames; and

displaying the selected frame as if it were a key frame.

2. The method of claim 1, wherein identifying a key frame in the compressed video that is temporally proximate to the selected frame comprises identifying a key frame that is nearest to and temporally precedes the selected frame.

3. The method of claim 1, wherein playing the set of frames comprises, for at least one of the frames in the set, decreasing a value of the playback timestamp of that frame.

4. The method of claim 3, wherein decreasing the value comprises setting the value substantially equal to zero.

5. The method of claim 3, further comprising setting a value of the playback timestamp of each frame in the set of frames substantially equal to zero.

6. The method of claim 5, further comprising decreasing a value of the playback timestamp of the selected frame.

7. The method of claim 6, wherein decreasing the value of the playback timestamp of the selected frame comprises setting the value of the playback timestamp of the selected frame substantially equal to zero.

8. The method of claim 6, further comprising setting the playback timestamp of at least one of the frames following the selected frame to a value greater than the playback timestamp of the selected frame.

9. The method of claim 1, wherein displaying the selected frame as if it were a key frame comprises displaying the selected frame as a complete image.

10. The method of claim 1, further comprising inserting, after the selected frame, a command to pause the video.

11. A system comprising:

one or more computers programmed to perform operations comprising;

receiving a selection of a frame in a compressed video that is not a key frame, the compressed video comprising a plurality of frames, each frame comprising a playback timestamp, at least one of the frames comprising a key frame;

identifying a key frame in the compressed video that is temporally proximate to the selected frame;

playing a set of frames comprising all of the frames between the identified key frame and the selected frame, wherein the playing of the set of frames is performed in a reduced time interval relative to a normal playback time interval of the set of frames; and

displaying the selected frame as if it were a key frame.

12. The system of claim 11, wherein identifying a key frame in the compressed video that is temporally proximate to the selected frame comprises identifying a key frame that is nearest to and temporally precedes the selected frame.

13. The system of claim 11, wherein playing the set of frames comprises, for at least one of the frames in the set, decreasing a value of the playback timestamp of that frame.

14. The system of claim 13, wherein decreasing the value comprises setting the value substantially equal to zero.

15. The system of claim 13, wherein the operations further comprise setting a value of the playback timestamp of each frame in the set of frames substantially equal to zero.

16. The system of claim 15, wherein the operations further comprise decreasing a value of the playback timestamp of the selected frame.

17. The system of claim 16, wherein decreasing the value of the playback timestamp of the selected frame comprises setting the value of the playback timestamp of the selected frame substantially equal to zero.

18. The system of claim 16, wherein the operations further comprise setting the playback timestamp of at least one of the frames following the selected frame to a value greater than the playback timestamp of the selected frame.

19. The system of claim 11, wherein displaying the selected frame as if it were a key frame comprises displaying the selected frame as a complete image.

20. The system of claim 11, wherein the operations further comprise inserting, after the selected frame, a command to pause the video.