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

[Deepthi Nandakumar]

This is primarily a visual quality improvement/psy-rd hack. In 444, since
chroma resolution is on par with luma, and our eyes arent very sensitive to
chroma, we increase the chroma QP so that those bits can be used up in
luma.


On Wed, Jun 25, 2014 at 4:35 PM, Derek Buitenhuis <
derek.buitenhuis at gmail.com> wrote:

> On 6/25/2014 1:22 AM, deepthi at multicorewareinc.com wrote:
> > +    /* In 444, chroma gets twice as much resolution, so halve quality
> when psy-rd is enabled */
> > +    if (p->internalCsp == X265_CSP_I444 && p->psyRd)
> > +    {
> > +        p->cbQpOffset += 6;
> > +        p->crQpOffset += 6;
> > +    }
>
> I dont really understand what the reasoning is for this? Is it just to
> make it
> fit with the model psy-rd is currently using?
>
> - Derek
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