[x265] [PATCH 1 of 3] Chroma QP Offset: increase chroma QP when psy-rd is enabled

[Deepthi Nandakumar]

They are.
encoder.c:x264_validate_parameters
if( b_open && i_csp >= X264_CSP_I444 && i_csp < X264_CSP_BGR &&
h->param.analyse.b_psy )
        h->param.analyse.i_chroma_qp_offset += 6;


On Wed, Jun 25, 2014 at 11:12 PM, Derek Buitenhuis <
derek.buitenhuis at gmail.com> wrote:

> On 6/25/2014 3:45 PM, Deepthi Nandakumar wrote:
> > In a sense, psy-rd encapsulates all those r-d algorithms/tweaks/hacks
> that improve visual quality but may hurt objective metrics like psnr/ssim.
> > In 444, this qp hack is likely to hurt objective metrics, hence it's
> turned on only if psychovisual improvement is desired.
>
> OK.
>
> Was curious, since these are not lumped in with psy-rd in x264.
>
> - Derek
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