Limiting CABAC complexity (revisited)

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Limiting CABAC complexity (revisited)
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Summary

• Minimum compression ratio per picture
• 41 for levels targeted at low-bandwidth apps
• 21 for levels targeted at high-bandwidth apps
• Express minimum compression ratio as function of
  max MB/s and delta T
• MaxBitsInPicture ZKMaxMBperSeconddeltaT
• Where
• Z 0.25 or 0.5 (minimum compression ratio)
• K 8384 for 420, 8512 for 422 (bits in
  raw MB)
• Maximum bins per picture
• MaxBinsInPicture 4/3BitsInPicture
  64MBsInPicture

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Example

• 1080i, 30fps, frame coding, 20Mbps, min
  compression ratio 4
• MaxBitPerPicture 6291456 bits
• Max bins _at_ max bits 8912896 bins
• Bin rate 267Mbins/sec
• Bin/bit ratio 1.42
• MaxAvgBitPerPicture 666667 bits
• Max bins _at_ avg bits 1413177 bins
• Bin rate 42Mbins/sec
• Bin/bit ratio 2.12