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Originally Posted by benwaggoner
Given it is a psychovisual optimization, aq-strength tends to improve subjective quality while reducing objective metrics. Thus you can't use objective metrics to determine if it is useful or not.
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Ah yes, I forgot that --aq-spatial is a psychovisual optimization. Thanks.
From the NVIDIA SDK docs:
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Although spatial AQ improves the perceptible visual quality of the encoded video, the required bit redistribution results in PSNR drop in most of the cases. Therefore, during PSNR-based evaluation, this feature should be turned off.
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