265
-devs say 24 (lambda changes) preserve more detail on live-action content
-twc says
"    Detail retention is still not competitive with x264. Disabling stuff like SAO helps with this, but then x265 loses all its advantages in edge artifacts.
    Ghosting artifacts have existed since the beginning (see the Bitbucket issues), but no sign of any developer interest in a solution.
    The recent lambda table change causes massive ringing artifacts on animated content, unless AQ strength is lowered.
    x265 still tends to produce bizarre circular artifacts in flat areas. Banding is also persistent.
"
-25 does preserve more detail than 23 (on live & cgi) but seems to make soft glows on DD/rebecca (confirns twc's halos?
-25 + aq 0.5 solves this.
-25 does generally preserve more details as lowering aq to 0.5 drops them (bourne street)
-YOu can't increase 23 to the level of 25 by increasing aq to 2.0

[21:59:55] * Arwen is slowly converging on the previously chosen settings: aq 0.5, psy-rd 2/4, qcomp 0.8
[22:04:07] <JEEB> sounds sane enough
[22:04:21] <JEEB> also I liked how MSU saw that humans preferred --tune ssim
[22:04:29] <JEEB> on low bit rates
[22:04:49] <JEEB> (where the psy things weren't able to kick in properly and produced artifacts)
[22:15:15] <Arwen> the main new thing I learned is that qg=64 is the way to go

Arwen> anyway, it's no magic: AQ 0.5 to counter-act the braindead "improved" lambda table
01:56 <Arwen> psy-rdoq 4.0 because it's the least damaging way to increase detail retention
01:57 <Arwen> qcomp 0.8 to put the HEVC coding efficiency where it matters instead of using it to raise the average quality from 99.9% yo 99.99^
01:57 <Arwen> and qg64 to prevent weird artifacts (costs detail though)