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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 Adaptive GOP Structure

  • Introduction

  • Related Work

  • Methods

  • Experimental Results


Introduction
Introduction Adaptive GOP Structure

  • Idea 1:

    • Scene change

  • Idea 2:

    • Scheduling


Related work 1
Related Work #1 Adaptive GOP Structure

  • 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 Adaptive GOP Structure

  • 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 Adaptive GOP Structure

  • Frame-level parallelism


Method 1
Method #1 Adaptive GOP Structure

  • Sum of absolute temporal difference (SATD)

    • Where is the pixel value at location (x,y).


Method 2
Method #2 Adaptive GOP Structure

  • Sum of absolute spatial difference (SASD)


Method 3
Method #3 Adaptive GOP Structure

  • Sum of absolute spatial difference (SASD)


Method 4
Method #4 Adaptive GOP Structure


Method 5
Method #5 Adaptive GOP Structure

  • Abrupt Scene Change Detection Algorithm

    • If Ratio is greater than the predefined threshold

Abrupt Scene Change


Method 6
Method #6 Adaptive GOP Structure

  • Ratio noise

    • Threshold = 1.4


Method 7
Method #7 Adaptive GOP Structure


Method 8
Method #8 Adaptive GOP Structure

  • 2nd derivative

    • Local maxima of the ratios shall be at the positions where the values are negative.

    • Threshold = -1.0


Method 9
Method #9 Adaptive GOP Structure

  • 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 Adaptive GOP Structure

  • Beginning

    • Threshold = 0.7(0.3~1.0)

  • Ending

    • Convergence


Method 11
Method #11 Adaptive GOP Structure


Method 12
Method #12 Adaptive GOP Structure


Method 13
Method #13 Adaptive GOP Structure

I : 120ms

B : 290ms

P : 360ms


Method 14
Method #14 Adaptive GOP Structure


Method 15
Method #15 Adaptive GOP Structure


Method 16
Method #16 Adaptive GOP Structure


Method 17
Method #17 Adaptive GOP Structure


Experimental results 1
Experimental Results #1 Adaptive GOP Structure


Experimental results 2
Experimental Results #2 Adaptive GOP Structure


Experimental results 3
Experimental Results #3 Adaptive GOP Structure


Experimental results 4
Experimental Results #4 Adaptive GOP Structure


Experimental results 5
Experimental Results #5 Adaptive GOP Structure


Experimental results 6
Experimental Results #6 Adaptive GOP Structure


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