[x265] Adaptive Quantization vs. different presets

[Mario *LigH* Rohkrämer]

I noticed that enabling Adaptive Quantization (--aq-mode 1) may or may not  
lead to visible artefacts. The dependencies are not yet certain. But a  
user in the doom9 forum (vood007) mentioned a relation to presets, as I  
reported artefacts with a command line not using any preset, but a clean  
result when using "--preset slower". This should probably be checked, as I  
suspect it to indicate possibly not correctly initialized  
options/variables in specific cases.

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Fun and success!
Mario *LigH* Rohkrämer
mailto:contact at ligh.de