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Multi-CPU Video Processing

Multi-CPU Video Processing. Igor Jánoš. Goal of This Project. Decode and process a full-HD video clip using only software resources Dimension – 1920 x 1080 pixels. Motivation. High computational power demands for HD video Latest trend – integrate more CPU cores in one chip

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Multi-CPU Video Processing

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  1. Multi-CPU Video Processing Igor Jánoš

  2. Goal of This Project • Decode and process a full-HD video clip using only software resources • Dimension – 1920 x 1080 pixels

  3. Motivation • High computational power demands for HD video • Latest trend – integrate more CPU cores in one chip • Systems without powerful GPU • GPU is busy with another job

  4. Video Filters • Deinterlace • Noise reduction • Color controls • No dependencies among resulting pixels • Very good for thread-parallel processing

  5. Deinterlace Filter • Produces frames at doubled rate – higher memory demands • Combines odd and even lines from successive frames • Half-pixel shift to reduce comb effect • Reads 2 frames • Writes 2 frames

  6. Previous Frame Current Frame Generated Interlaced Frame Output Frame 1 Output Frame 2

  7. Denoise Filter • Gradual noise reduction • Threshold – reduces temporal noise • Weighted averaging • More difficult to compute • Reads 2 frames • Writes 1 frame

  8. Two successive frames in a stationary scene

  9. Without Denoise Filter

  10. With Denoise Filter

  11. Color Controls Filter • Reads 1 frame • Writes 1 frame • Easy to compute in Y-U-V color space

  12. Color Controls Filter

  13. Basic algorithm idea • “Divide & Conquer” approach • Assign a part of a larger job for each CPU core

  14. Experiment • Use processing filters with live video and offline content • Standard Definition • High Definition

  15. Results

  16. Results

  17. Conclusion • Software-only thread-parallel processing is possible in real-time • Memory performance is the bottleneck • DI performance drop after exceeding memory page size • Latest Quad-Core CPUs from Intel with enlarged L2 cache - 40% faster

  18. Future Work • Different frame buffer structure • Hybrid encoder/decoder (GPU + Multi-core CPU) • GPU – motion estimation & compensation, color space conversion, deblocking • CPU – VLC, transformations, intra predictions

  19. Thank you

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