From 8c825e43f80b1c2faa417f42e0595b5887226367 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Fri, 22 May 2020 14:12:06 +0200
Subject: [PATCH] avfilter/af_aiir: fix first denominator calculation

---
 libavfilter/af_aiir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c
index 8b362817b79..bacdab60882 100644
--- a/libavfilter/af_aiir.c
+++ b/libavfilter/af_aiir.c
@@ -1038,8 +1038,9 @@ static int config_output(AVFilterLink *outlink)
             iir->ab[0][i] /= iir->ab[0][0];
         }
 
+        iir->ab[0][0] = 1.0;
         for (i = 0; i < iir->nb_ab[1]; i++) {
-            iir->ab[1][i] *= iir->g / iir->ab[0][0];
+            iir->ab[1][i] *= iir->g;
         }
 
         normalize_coeffs(ctx, ch);
-- 
2.39.5