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Balanced Parallel Scheduling for Video Encoding with Adaptive GOP Structure. IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, VOL. 24, NO. 12, DECEMBER 2013 Hsu- Feng Hsiao, Member, IEEE, and Chen-Tsang Wu. Outline. Introduction Related Work Methods Experimental Results.

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balanced parallel scheduling for video encoding with adaptive gop structure

Balanced Parallel Scheduling for Video Encoding with Adaptive GOP Structure

IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, VOL. 24, NO. 12, DECEMBER 2013

Hsu-Feng Hsiao, Member, IEEE, and Chen-Tsang Wu

outline
Outline
  • Introduction
  • Related Work
  • Methods
  • Experimental Results
introduction
Introduction
  • Idea 1:
    • Scene change
  • Idea 2:
    • Scheduling
related work 1
Related Work #1
  • Scene change detection
    • Abrupt scene change
      • An abrupt scene change indicates that transition from one scene into another only spends a period of one frame.
    • Gradual scene change
      • A gradual scene change takes a period of several frames to complete a scene transition.
related work 2
Related Work #2
  • Pixel-based method
    • Sum of mean absolute difference (SMAD)
  • Block-based method
    • A scene change is declared if the ratio of similar blocks between two frames is greater than some threshold.
related work 3
Related Work #3
  • Frame-level parallelism
method 1
Method #1
  • Sum of absolute temporal difference (SATD)
    • Where is the pixel value at location (x,y).
method 2
Method #2
  • Sum of absolute spatial difference (SASD)
method 3
Method #3
  • Sum of absolute spatial difference (SASD)
method 5
Method #5
  • Abrupt Scene Change Detection Algorithm
    • If Ratio is greater than the predefined threshold

Abrupt Scene Change

method 6
Method #6
  • Ratio noise
    • Threshold = 1.4
method 8
Method #8
  • 2nd derivative
    • Local maxima of the ratios shall be at the positions where the values are negative.
    • Threshold = -1.0
method 9
Method #9
  • Gradual Scene Change Detection Algorithm
    • A gradual scene change takes a period of several frames
      • Ratio(n,m) is the ratio between frame n and frame m.
method 10
Method #10
  • Beginning
    • Threshold = 0.7(0.3~1.0)
  • Ending
    • Convergence
method 13
Method #13

I : 120ms

B : 290ms

P : 360ms

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