Dynamic real-time playback

• US 8,996,996 B2
• Filed: 01/29/2014
• Issued: 03/31/2015
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Agarwal, Sachin, Agnoli, Giovanni, Meaney, Brian Everett
• Primary Examiner(s): SALOMON, PHENUEL S
• Application Number:
  US14/166,908
• Publication Number:
  US 20140147098A1
• Time in Patent Office: 426 Days
• US Class Current: 715/723
• CPC Class Codes: G11B 27/02 Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/34 Indicating arrangements indicating means incorporated in magazine or cassette G11B23/046 and G11B23/0875; indicating measured values in general G01D

Abstract

Systems and methods for previewing edited video. In general, in one implementation, a method includes generating a video sequence from a plurality of video segments, identifying an inability to output at least one video segment in the video sequence in substantially real time; and adjusting an output level associated with the at least one video segment to enable the at least one video segment to be output in substantially real time. The output level may include a video quality or a frame rate.

Claims

1. A computer-implemented method, the method comprising:

generating a preview video sequence from a plurality of video segments;

determining prior to playback, for each of the plurality of video segments in the preview video sequence, a cost associated with outputting the video segment at a specified video quality and a specified frame rate, the cost being in terms of system resources;

identifying in conjunction with the generating the preview video segment, a first video segment in the preview video sequence that cannot be output at the specified video quality and the specified frame rate based at least in part on the determined cost; and

dynamically adjusting at least one of video quality or video frame rate of the first video segment to enable the video segment portion of the video sequence to be output at a consistent video quality and frame rate.

2. The computer-implemented method of claim 1, further comprising:

preserving an output level associated with plurality of video segments in the preview video sequence that are able to be output at a specified video quality and a specified frame rate associated with each of the plurality of video segments.

3. The computer-implemented method of claim 1, further comprising:

selecting a video quality;

identifying an inability to output a particular video segment of the preview video sequence consistently at the selected video quality; and

adjusting a level of video quality associated with the particular video segment, the adjustment being to a highest available level of video quality that enables the particular video segment to be output consistently.

4. The computer-implemented method of claim 1, wherein generating the preview video sequence includes:

editing a subset of the plurality of video segments to add an effect.

5. The computer-implemented method of claim 1, further comprising:

outputting the preview video sequence at a consistent video quality and frame rate after the at least one of video quality or video frame rate of the first video segment has been adjusted.

6. The computer-implemented method of claim 5, wherein outputting the preview video sequence includes outputting the preview video sequence without any user perceivable gaps, delays, skips, or other time induced artifacts.

7. The computer-implemented method of claim 1, further comprising:

selecting a frame rate;

identifying an inability to output a particular video segment of the preview video sequence consistently at the selected frame rate; and

adjusting the selected frame rate associated with the particular video segment, the adjustment being to a highest available frame rate that enables the particular video segment to be output consistently.

8. A non-transitory computer-readable medium encoded with a computer program comprising instructions that, when executed by a data processing apparatus, cause the data processing apparatus to perform operations comprising:

generating a preview video sequence from a plurality of video segments;

determining prior to output, for each of the plurality of video segments in the preview video sequence, a cost associated with outputting the video segment at a specified video quality and a specified frame rate, the cost being in terms of system resources;

identifying in conjunction with the generating the preview video segment, a first video segment in the preview video sequence that cannot be output at the specified video quality and the specified frame rate based at least in part on the determined cost; and

dynamically adjusting at least one of video quality or video frame rate of the first video segment to enable the video segment portion of the video sequence to be output at a consistent video quality and frame rate.

9. The non-transitory computer-readable medium of claim 8, further including instructions that, when executed by a data processing apparatus, cause the data processing apparatus to perform operations comprising:

preserving an output level associated with plurality of video segments in the preview video sequence that are able to be output at a specified video quality and a specified frame rate associated with each of the plurality of video segments.

10. The non-transitory computer-readable medium of claim 8, further including instructions that, when executed by a data processing apparatus, cause the data processing apparatus to perform operations comprising:

selecting a video quality;

identifying an inability to output a particular video segment of the preview video sequence consistently at the selected video quality; and

adjusting a level of video quality associated with the particular video segment, the adjustment being to a highest available level of video quality that enables the particular video segment to be output consistently.

11. The non-transitory computer-readable medium of claim 8, wherein the generating the preview video sequence includes:

editing a subset of the plurality of video segments to add an effect.

12. The non-transitory computer-readable medium of claim 8, further including instructions that, when executed by a data processing apparatus, cause the data processing apparatus to perform an operation comprising:

outputting the preview video sequence at a consistent video quality and frame rate after the at least one of video quality or video frame rate of the first video segment has been adjusted.

13. The non-transitory computer-readable medium of claim 12, wherein outputting the preview video sequence includes outputting the preview video sequence without any user perceivable gaps, delays, skips, or other time induced artifacts.

14. The non-transitory computer-readable medium of claim 8, further including instructions that, when executed by a data processing apparatus, cause the data processing apparatus to perform an operation comprising:

selecting a frame rate;

identifying an inability to output a particular video segment of the preview video sequence consistently at the selected frame rate; and

adjusting the selected frame rate associated with the particular video segment, the adjustment being to a highest available frame rate that enables the particular video segment to be output consistently.

15. A system, comprising:

a computer-readable medium storing a plurality of video segments included in two or more tracks; and

a processor communicatively coupled to the computer-readable medium, the processor configured to execute;

an editing time line to edit a video segment of the plurality of video segments and to generate a preview video sequence from the two or more tracks;

a cost block to calculate, prior to playback, a cost associated with outputting each of the video segments included in the preview video sequence at a specified video quality and a specified frame rate, the cost being in terms of system resources; and

a preview block, in communication with the editing timeline, the preview block to identify in conjunction with the generation of the preview video sequence, at least one video segment in the preview video sequence that cannot be at the specified video quality and the specified frame rate based at least in part on the determined cost, the preview block dynamically adjusting at least one of video quality or video frame rate of each individual identified video segment to enable the at least one identified video segment to be output at a consistent video quality and frame rate.

16. The system of claim 15, the processor further configured to execute:

a real time engine, in communication with the editing timeline and the preview block, the real time engine to output the preview video sequence in substantially real time, including dynamically allocating a size of one or more buffers associated with outputting the preview video sequence.

17. The system of claim 16, wherein the real time engine is further to allocate the size of the one or more buffers in accordance with a frame resolution of a current video segment in the preview video sequence.

18. The system of claim 15, the processor further configured to execute:

a rendering engine, in communication with the preview block, the rendering engine configured to render an output preview video sequence responsive to the inability of the preview block to output each video segment included in the preview video sequence at the specified video quality and the specified frame rate.

19. The system of claim 15, wherein the preview block is to preserve an output level associated with plurality of video segments in the preview video sequence that are able to be output at a specified video quality and a specified frame rate associated with each of the plurality of video segments.

20. The system of claim 15, wherein the preview block is to output the preview video sequence at a consistent video quality and frame rate after the at least one of video quality or video frame rate of the first video segment has been adjusted.