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>From 28fa59b0b10d3b82aedd0ba7138e93f21883c774 Mon Sep 17 00:00:00 2001</div>
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From: somuvineela <somu@multicorewareinc.com></div>
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Date: Tue, 22 Jul 2025 19:18:03 +0530</div>
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Subject: [PATCH] Enforce framethreads to 1 for zerolatency tune</div>
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<br>
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FFmpeg overrides frameNumThreads based on avctx->thread_count, so frameNumThreads is forced to one in encoder_open() when zerolatency tune is set.</div>
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---</div>
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source/common/param.cpp | 2 ++</div>
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source/encoder/encoder.cpp | 6 ++++++</div>
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source/x265.h | 3 +++</div>
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3 files changed, 11 insertions(+)</div>
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diff --git a/source/common/param.cpp b/source/common/param.cpp</div>
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index a35b06339..598ae21b6 100755</div>
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--- a/source/common/param.cpp</div>
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+++ b/source/common/param.cpp</div>
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@@ -641,6 +641,7 @@ int x265_param_default_preset(x265_param* param, const char* preset, const char*</div>
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}</div>
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if (tune)</div>
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{</div>
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+ param->tune = tune;</div>
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if (!strcmp(tune, "psnr"))</div>
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{</div>
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param->rc.aqStrength = 0.0;</div>
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@@ -2702,6 +2703,7 @@ void x265_copy_params(x265_param* dst, x265_param* src)</div>
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if (strlen(src->numaPools)) snprintf(dst->numaPools, X265_MAX_STRING_SIZE, "%s", src->numaPools);</div>
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else dst->numaPools[0] = 0;</div>
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</div>
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+ dst->tune = src->tune;</div>
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dst->bEnableWavefront = src->bEnableWavefront;</div>
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dst->bDistributeModeAnalysis = src->bDistributeModeAnalysis;</div>
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dst->bDistributeMotionEstimation = src->bDistributeMotionEstimation;</div>
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diff --git a/source/encoder/encoder.cpp b/source/encoder/encoder.cpp</div>
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index 2e65cb1a9..5b1efdcbf 100644</div>
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--- a/source/encoder/encoder.cpp</div>
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+++ b/source/encoder/encoder.cpp</div>
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@@ -254,6 +254,12 @@ void Encoder::create()</div>
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p->bEnableWavefront = 0;</div>
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}</div>
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</div>
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+ // For zero-latency tune, frameNumThreads must be set to 1</div>
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+ if (p->tune && (!strcmp(p->tune, "zerolatency") || !strcmp(p->tune, "zero-latency")))</div>
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+ {</div>
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+ p->frameNumThreads = 1;</div>
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+ }</div>
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+</div>
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bool allowPools = !strlen(p->numaPools) || strcmp(p->numaPools, "none");</div>
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</div>
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// Trim the thread pool if --wpp, --pme, and --pmode are disabled</div>
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diff --git a/source/x265.h b/source/x265.h</div>
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index 7241beda2..fcc8337df 100644</div>
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--- a/source/x265.h</div>
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+++ b/source/x265.h</div>
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@@ -2344,6 +2344,9 @@ typedef struct x265_param</div>
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/*Frame level RateControl Configuration*/</div>
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int bConfigRCFrame;</div>
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int isAbrLadderEnable;</div>
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+</div>
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+ /*tune*/</div>
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+ const char* tune;</div>
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} x265_param;</div>
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</div>
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/* x265_param_alloc:</div>
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-- </div>
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2.43.0.windows.1</div>
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