Quote:
Originally Posted by x265_Project
Release Notes...
x265 0.6 is a regularly scheduled release
* Adaptive Quantization introduced (experimental)
Adaptive Quantization is still considered experimental. We are not always seeing the expected improvements to SSIM when it is enabled, and thus it is still not enabled by default.
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If your AQ is based on the one from x264, it is considerably more advanced and subjectively correlated than SSIM. If it is on, you will probably see a bigger gap between SSIM and PSNR. But the only really relevant way to check is subjective comparison.
From my experimenting in the last couple of weeks, it did seem to provide a significant visual improvement, although I wasn't doing comprehensive testing.