Video and Image Processing Suite User Guide

ID 683416
Date 4/04/2022
Public
Document Table of Contents

15.7. Motion Adaptive Mode Bandwidth Requirements

The bandwidth usage for motion adaptive mode is 100% efficient.
For the example of 10bit 4:2:2 YCbCr video 1080i video, the requirements may be calculated as below.
  • Image data:

    For every pair of output lines produced there are two phases:

    Phase 1: Read 2 lines = 1920 × 10 bits x 2 (YCbCr) × 2 = 76,800 bits per input line

    Phase 2: Write 1 line, Read 1 line, = 1920 × 10 bits × 2 × 2 = 76,800 bits per input line

    Phase 1 + phase 2 accesses = 153,600 bits of image data per input line

    153600 × 540 lines = 82,944,000 bits per output frame

    82944000 × 60 frames per second = 4,976,640,000 = 4.977 GBps of image data read/written

  • Motion data:

    Motion data is always 8 bits per pixel regardless of color space.

    Read & Write motion = 1920 × 8 bits × 2 (one read and one write) = 30,720 bits per input line

    30,720 × 540 lines = 16,588,800 bits per output frame

    16,588,800 × 60 frames per second = 995,328,000 = 0.995 GBps of motion data written/read

  • Video-over-film data:

    Motion data is always 24 bits per pixel regardless of color space.

    1920 × 24 bits × 2 (one read and one write per pixel) = 92,160 bits per input line

    92,160 × 540 lines = 49,766,400 bits per output frame

    49,766,400 × 60 frames per second = 2,985,984,000 = 2.985 GBps of video over film data written/read

Total bandwidth (without video over film cadence detection) = 4.977 + 0.995 = 5.972 GBps

Total bandwidth (with video over film cadence detection) = 5.972 + 2.985 = 8.957 GBps

CAUTION:
Some memory configurations for motion adaptive configurations of the Deinterlacer II (excluding video over film configurations) can result in motion information being incorrectly overwritten by information from subsequent lines, resulting in a reduction in QOR manifesting in weave artifacts. If you observe weave artifacts in motion adaptive configurations, file an Intel Premier Support case on the Intel Support page.