From a174e5f8da77d17dc16227f94eb14db7fd0365a4 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sun, 20 Oct 2019 21:53:11 +0200
Subject: [PATCH] avfilter/vf_nlmeans: round values toward nearest integer

Instead of rounding toward zero and thus producing
darker output.
---
 libavfilter/vf_nlmeans.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_nlmeans.c b/libavfilter/vf_nlmeans.c
index dcb5a03953..06233b0dd4 100644
--- a/libavfilter/vf_nlmeans.c
+++ b/libavfilter/vf_nlmeans.c
@@ -419,7 +419,7 @@ static void weight_averages(uint8_t *dst, ptrdiff_t dst_linesize,
             // Also weight the centered pixel
             wa[x].total_weight += 1.f;
             wa[x].sum += 1.f * src[x];
-            dst[x] = av_clip_uint8(wa[x].sum / wa[x].total_weight);
+            dst[x] = av_clip_uint8(wa[x].sum / wa[x].total_weight + 0.5f);
         }
         dst += dst_linesize;
         src += src_linesize;