Video-segment identification systems and methods

1. A computer-implemented method for efficiently identifying summarization segments of an encoded video without the need to decode the encoded video to obtain image data, the method comprising:

identifying, by the computer, a sequenced plurality of intra-coded frames of the encoded video;

determining, by the computer, a plurality of encoded-buffer sizes corresponding respectively to the sequenced plurality of intra-coded frames; and

selecting, by the computer, a plurality of summarization segments of the encoded video by, for each of the plurality of summarization segments:

identifying a start of a corresponding summarization segment of the plurality of summarization segments based on a first encoded-buffer-size delta between a first encoded-buffer size of a first target intra-coded frame of the sequenced plurality of intra-coded frames and a minimum encoded-buffer size of a first preceding intra-coded frame among a first plurality of preceding intra-coded frames within a first time-window that precedes the first target intra-coded frame: and

identifying an end of the corresponding summarization segment of the plurality of summarization segments based on a second encoded-buffer-size delta between a second encoded-buffer size of a second target intra-coded frame of the sequenced plurality of intra-coded frames and a maximum encoded-buffer size of a second preceding intra-coded frame among a second plurality of preceding intra-coded frames within a second time-window that precedes the second target intra-coded frame.

2. The method of claim 1 , further comprising automatically generating a video presentation summarizing the encoded video, the video presentation including the plurality of summarization segments.

3. The method of claim 1 , further comprising:

obtaining a second plurality of summarization segments selected from a second encoded video;

scoring the plurality of summarization segments and the second plurality of summarization segments according to a metric associated with encoded-buffer-size deltas;

selecting a first subset of the plurality of summarization segments and a second subset of the second plurality of summarization segments; and

automatically generating a video presentation summarizing the encoded video and the second encoded video, the video presentation including the first selected subset and the second selected subset.

4. The method of claim 1 , wherein identifying the start of the corresponding summarization segment of the plurality of summarization segments comprises:

determining that the start of the corresponding summarization segment of the plurality of summarization segments starts at a timestamp associated with the first target intra-coded frame of the corresponding summarization segment.

5. The method of claim 1 , wherein identifying the start of the corresponding summarization segment of the plurality of summarization segments comprises:

determining that the first encoded-buffer-size delta exceeds a segment-start threshold.

6. The method of claim 1 , wherein identifying the end of the corresponding summarization segment of the plurality of summarization segments comprises:

determining that the second encoded-buffer-size delta exceeds a segment-end threshold.

7. The method of claim 1 , wherein selecting the plurality of summarization segments comprises:

determining that the end of the corresponding summarization segment of the plurality of summarization segments ends at a timestamp associated with the second target intra-coded frame of the corresponding summarization segment.

8. The method of claim 1 , wherein selecting the plurality of summarization segments comprises ensuring that the plurality of summarization segments are separated by at least a minimum time-gap.

9. The method of claim 1 , wherein selecting the plurality of summarization segments comprises ensuring that each of the plurality of summarization segments are at least a minimum duration in length.

10. A computing apparatus for efficiently identifying summarization segments of an encoded video without the need to decode the encoded video to obtain image data, the apparatus comprising a processor and a memory storing instructions that, when executed by the processor, configure the apparatus to:

identify a sequenced plurality of intra-coded frames of the encoded video;

determine a plurality of encoded-buffer sizes corresponding respectively to the sequenced plurality of intra-coded frames, and

select a plurality of summarization segments of the encoded video including, for each of the plurality of summarization segments:

identify a start of a corresponding summarization segment of the plurality of summarization segments based on a first encoded-buffer-size delta between a first encoded-buffer size of a first target intra-coded frame of the sequenced plurality of intra-coded frames and a minimum encoded-buffer size of a first preceding intra-coded frame among a first plurality of preceding intra-coded frames within a first time-window that precedes the first target intra-coded frame; and

identify an end of the corresponding summarization segment of the plurality of summarization segments based on a second encoded-buffer-size delta between a second encoded-buffer size of a second target intra-coded frame of the sequenced plurality of intra-coded frames and a maximum encoded-buffer size of a second preceding intra-coded frame among a second plurality of preceding intra-coded frames within a second time-window that precedes the second target intra-coded frame.

11. The apparatus of claim 10 , wherein the memory stores further instructions that further configure the apparatus to automatically generate a video presentation summarizing the encoded video, the video presentation including the plurality of summarization segments.

12. The apparatus of claim 10 , wherein the memory stores further instructions that further configure the apparatus to:

obtain a second plurality of summarization segments selected from a second encoded video;

score the plurality of summarization segments and the second plurality of summarization segments according to a metric associated with encoded-buffer-size deltas;

select a first subset of the plurality of summarization segments and a second subset of the second plurality of summarization segments; and

automatically generate a video presentation summarizing the encoded video and the second encoded video, the video presentation including the first selected subset and the second selected subset.

13. The apparatus of claim 10 , wherein the instructions that configure the apparatus to select the plurality of summarization segments further comprise instructions configuring the apparatus to:

determine that the start of the corresponding summarization segment of the plurality of summarization segments starts at a timestamp associated with the first target intra-coded frame of the corresponding summarization segment.

14. The apparatus of claim 10 , wherein the instructions that configure the apparatus to identify the start of the corresponding summarization segment of the plurality of summarization segments further comprise instructions configuring the apparatus to:

determine that the first encoded-buffer-size delta exceeds a segment-start threshold.

15. The apparatus of claim 10 , wherein the instructions that configure the apparatus to identify the end of the corresponding summarization segment of the plurality of summarization segments further comprise instructions configuring the apparatus to:

determine that the second encoded-buffer-size delta exceeds a segment-end threshold.

16. A non-transitory computer-readable storage medium having stored thereon instructions including instructions that, when executed by a processor, configure the processor to:

identify a sequenced plurality of intra-coded frames of an encoded video;

determine a plurality of encoded-buffer sizes corresponding respectively to the sequenced plurality of intra-coded frames; and

select a plurality of summarization segments of the encoded video including, for each of the plurality of summarization segments:

identify a start of a corresponding summarization segment of the plurality of summarization segments based on a first encoded-buffer-size delta between a first encoded-buffer size of a first target intra-coded frame of the sequenced plurality of intra-coded frames and a minimum encoded-buffer size of a first preceding intra-coded frame among a first plurality of preceding intra-coded frames within a first time-window that precedes the first target intra-coded frame; and

identify an end of the corresponding summarization segment of the plurality of summarization segments based on a second encoded-buffer-size delta between a second encoded-buffer size of a second target intra-coded frame of the sequenced plurality of intra-coded frames and a maximum encoded-buffer size of a second preceding intra-coded frame among a second plurality of preceding intra-coded frames within a second time-window that precedes the second target intra-coded frame.

17. The non-transitory computer-readable storage medium of claim 16 , having stored thereon further instructions that further configure the processor to automatically generate a video presentation summarizing the encoded video, the video presentation including the plurality of summarization segments.

18. The non-transitory computer-readable storage medium of claim 16 , having stored thereon further instructions that further configure the processor to:

obtain a second plurality of summarization segments selected from a second encoded video;

score the plurality of summarization segments and the second plurality of summarization segments according to a metric associated with encoded-buffer-size deltas;

select a first subset of the plurality of summarization segments and a second subset of the second plurality of summarization segments; and

automatically generate a video presentation summarizing the encoded video and the second encoded video, the video presentation including the first selected subset and the second selected subset.

19. The non-transitory computer-readable storage medium of claim 16 , wherein the instructions that configure the processor to select the plurality of summarization segments further comprise instructions configuring the processor to:

determine that the start of the corresponding summarization segment of the plurality of summarization segments starts at a timestamp associated with the first target intra-coded frame of the corresponding summarization segment.

20. The non-transitory computer-readable storage medium of claim 16 , wherein the instructions that configure the processor to identify the start of the corresponding summarization segment of the plurality of summarization segments further comprise instructions configuring the processor to:

determine that the first encoded-buffer-size delta exceeds a segment-start threshold.

21. The non-transitory computer-readable storage medium of claim 19 , wherein the instructions that configure the processor to identify the end of the corresponding summarization segment of the plurality of summarization segments further comprise instructions configuring the processor to:

determine that the second encoded-buffer-size delta exceeds a segment-end threshold.