[x265] [PATCH] Reduce QP for the scene changes that is followed by black frames

[Aruna Matheswaran]

Pushed to default.

On Mon, Aug 19, 2019 at 10:35 AM <pooja at multicorewareinc.com> wrote:

> # HG changeset patch
> # User Pooja Venkatesan <pooja at multicorewareinc.com>
> # Date 1552816785 -19800
> #      Sun Mar 17 15:29:45 2019 +0530
> # Node ID f0b531ade27567f539d80e2592de146475f68080
> # Parent  de920e0a31831f52599f3937c3ee6945e88ed851
> Reduce QP for the scene changes that is followed by black frames
>
> During a scenecut, the transition from black frames to a different sequence
> gives a high QP value. Reducing tune complexity factor for the scene
> change in ABR reduces QP.
>
> diff -r de920e0a3183 -r f0b531ade275 source/encoder/ratecontrol.cpp
> --- a/source/encoder/ratecontrol.cpp    Tue Jul 23 17:03:51 2019 +0530
> +++ b/source/encoder/ratecontrol.cpp    Sun Mar 17 15:29:45 2019 +0530
> @@ -2116,6 +2116,9 @@
>              if ((underflow < epsilon || rce->isFadeEnd) && !isFrameDone)
>              {
>                  init(*m_curSlice->m_sps);
> +                // Reduce tune complexity factor for scenes that follow
> blank frames
> +                double tuneCplxFactor = (m_ncu > 3600 &&
> m_param->rc.cuTree && !m_param->rc.hevcAq) ? 2.5 : m_param->rc.hevcAq ? 1.5
> : m_isGrainEnabled ? 1.9 : 1.0;
> +                m_cplxrSum /= tuneCplxFactor;
>                  m_shortTermCplxSum = rce->lastSatd /
> (CLIP_DURATION(m_frameDuration) / BASE_FRAME_DURATION);
>                  m_shortTermCplxCount = 1;
>                  m_isAbrReset = true;
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>


-- 
Regards,
Aruna
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