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From fd5e47885c1b17c7504a2e231bd8f4054b630f75 Mon Sep 17 00:00:00 2001</div>
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From: Kirithika <kirithika@multicorewareinc.com></div>
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Date: Tue, 29 Jul 2025 10:28:50 +0530</div>
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Subject: [PATCH] SBRC: Tune ratefactor for simple/complex frames based on</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
segment average</div>
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<br>
</div>
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---</div>
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source/encoder/ratecontrol.cpp | 12 ++++++------</div>
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source/encoder/ratecontrol.h | 4 ++--</div>
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2 files changed, 8 insertions(+), 8 deletions(-)</div>
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<br>
</div>
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diff --git a/source/encoder/ratecontrol.cpp b/source/encoder/ratecontrol.cpp</div>
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index 3de97c278..2e264e5ff 100644</div>
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--- a/source/encoder/ratecontrol.cpp</div>
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+++ b/source/encoder/ratecontrol.cpp</div>
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@@ -2038,7 +2038,7 @@ double RateControl::rateEstimateQscale(Frame* curFrame, RateControlEntry *rce)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
</div>
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if (m_param->bEnableSBRC)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
{</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
- qScale = tuneQscaleForSBRC(curFrame, qScale, rce);</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ qScale = tuneQscaleForSBRC(curFrame, qScale);</div>
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rce->qpNoVbv = x265_qScale2qp(qScale);</div>
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}</div>
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</div>
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@@ -2264,8 +2264,10 @@ double RateControl::rateEstimateQscale(Frame* curFrame, RateControlEntry *rce)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
if (m_param->bEnableSBRC)</div>
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{</div>
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double rfConstant = m_param->rc.rfConstant;</div>
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- if (m_currentSatd < m_movingSumComplexitySeg[rce->sliceType])</div>
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+ if (m_currentSatd < (0.7 *m_movingSumComplexitySeg[rce->sliceType]))</div>
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rfConstant += 2;</div>
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+ else if (m_currentSatd > (1.3 *m_movingSumComplexitySeg[rce->sliceType]))</div>
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+ rfConstant -= 1;</div>
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double ipOffset = (curFrame->m_lowres.bScenecut ? m_ipOffset : m_ipOffset / 2.0);</div>
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rfConstant = (rce->sliceType == I_SLICE ? rfConstant - ipOffset :</div>
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(rce->sliceType == B_SLICE ? rfConstant + m_pbOffset : rfConstant));</div>
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@@ -2364,7 +2366,7 @@ double RateControl::rateEstimateQscale(Frame* curFrame, RateControlEntry *rce)</div>
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m_lastQScaleFor[P_SLICE] = X265_MAX(minScenecutQscale, m_lastQScaleFor[P_SLICE]);</div>
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}</div>
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if (m_param->bEnableSBRC)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
- q = tuneQscaleForSBRC(curFrame, q, rce);</div>
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+ q = tuneQscaleForSBRC(curFrame, q);</div>
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</div>
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rce->qpNoVbv = x265_qScale2qp(q);</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
if (m_sliceType == P_SLICE)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
@@ -2546,7 +2548,7 @@ double RateControl::predictSize(Predictor *p, double q, double var)</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
return (p->coeff * var + p->offset) / (q * p->count);</div>
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}</div>
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</div>
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-double RateControl::tuneQscaleForSBRC(Frame* curFrame, double q, RateControlEntry* rce)</div>
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+double RateControl::tuneQscaleForSBRC(Frame* curFrame, double q)</div>
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{</div>
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int depth = 0;</div>
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int framesDoneInSeg = m_framesDone % m_param->keyframeMax;</div>
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@@ -2579,8 +2581,6 @@ double RateControl::tuneQscaleForSBRC(Frame* curFrame, double q, RateControlEntr</div>
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double allowedSize = m_vbvMaxRate * segDur;</div>
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double remDur = segDur - totalDuration;</div>
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double remainingBits = frameBitsTotal;</div>
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-</div>
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- int framesLeft = m_param->totalFrames - m_framesDone;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
int isLastSegmentInaEncode = m_totalframesInSegment < m_param->keyframeMax;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
remainingBits = lookaheadBits / lookaheadDur * remDur;</div>
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</div>
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diff --git a/source/encoder/ratecontrol.h b/source/encoder/ratecontrol.h</div>
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index 244511e45..2e3672d58 100644</div>
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--- a/source/encoder/ratecontrol.h</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+++ b/source/encoder/ratecontrol.h</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
@@ -178,7 +178,7 @@ public:</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
int m_qpConstant[3];</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
int m_lastNonBPictType;</div>
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int m_framesDone; /* # of frames passed through RateCotrol already */</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
- int m_iBits;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ int64_t m_iBits;</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
double m_cplxrSum; /* sum of bits*qscale/rceq */</div>
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double m_wantedBitsWindow; /* target bitrate * window */</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
double m_accumPQp; /* for determining I-frame quant */</div>
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@@ -305,7 +305,7 @@ protected:</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
double rateEstimateQscale(Frame* pic, RateControlEntry *rce); // main logic for calculating QP based on ABR</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
double tuneAbrQScaleFromFeedback(double qScale);</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
double tuneQScaleForZone(RateControlEntry *rce, double qScale); // Tune qScale to adhere to zone budget</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
- double tuneQscaleForSBRC(Frame* curFrame, double q, RateControlEntry *rce); // Tune qScale to adhere to segment budget</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
+ double tuneQscaleForSBRC(Frame* curFrame, double q); // Tune qScale to adhere to segment budget  </div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
void accumPQpUpdate();</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
</div>
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int getPredictorType(int lowresSliceType, int sliceType);</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
-- </div>
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2.51.0.windows.1</div>
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