Quote:
Increases the RD-level at points where the bitrate drops due to vbv. The number of CUs for which the RD is reconfigured is determined based on the strength. Strength 1 gives the best FPS, strength 4 gives the best SSIM. Strength 0 switches this feature off. Default: 0.
Effective for RD levels 4 and below.
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We probably should have said "Increases the RD level at points where quality drops due to VBV rate control enforcement." I'll ask our team to improve the documentation.