From ed3b64402ef770097f81e4f1e17f1fca253159aa Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Wed, 9 Jan 2019 21:00:16 +0100
Subject: [PATCH] avfilter/af_anlmdn: ignore too small values

---
 libavfilter/af_anlmdn.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavfilter/af_anlmdn.c b/libavfilter/af_anlmdn.c
index 62931e37cc..a6422c1748 100644
--- a/libavfilter/af_anlmdn.c
+++ b/libavfilter/af_anlmdn.c
@@ -168,7 +168,10 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
             float w;
 
             av_assert0(distance >= 0.f);
-            w = expf(-distance * sw);
+            w = -distance * sw;
+            if (w < -11.f)
+                continue;
+            w = expf(w);
             P += w * f[i - S + j + (j >= S)];
             Q += w;
         }