From 3d6d127cd022c6d359bbf185dd136445b1411414 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Fri, 7 Oct 2022 13:28:03 +0200
Subject: [PATCH] avfilter/af_biquads: fix bandpass for zdf

---
 libavfilter/af_biquads.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c
index 03165bf22d..49ad0a471f 100644
--- a/libavfilter/af_biquads.c
+++ b/libavfilter/af_biquads.c
@@ -729,7 +729,7 @@ static void convert_dir2zdf(BiquadsContext *s, int sample_rate)
         a[1] = g * a[0];
         a[2] = g * a[1];
         m[0] = 0.;
-        m[1] = s->csg ? 1. : 2.;
+        m[1] = s->csg ? 1. : k;
         m[2] = 0.;
         break;
     case bandreject: