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.buitenh...@gmail.com> wrote: > On 6/25/2014 1:22 AM, deep...@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 > _______________________________________________ > x265-devel mailing list > x265-devel@videolan.org > https://mailman.videolan.org/listinfo/x265-devel >
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