From 8c1b65feb63e70eaa22c1462163573bea8b91695 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sat, 28 Aug 2021 18:44:17 +0200
Subject: [PATCH] avfilter/af_afreqshift: do not forget to update coeffs at
 runtime

---
 libavfilter/af_afreqshift.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavfilter/af_afreqshift.c b/libavfilter/af_afreqshift.c
index 90f0c3014e..0410bde70b 100644
--- a/libavfilter/af_afreqshift.c
+++ b/libavfilter/af_afreqshift.c
@@ -321,6 +321,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     AVFrame *out;
     ThreadData td;
 
+    if (s->old_nb_coeffs != s->nb_coeffs)
+        compute_coefs(s->cd, s->cf, s->nb_coeffs * 2, 2. * 20. / inlink->sample_rate);
+    s->old_nb_coeffs = s->nb_coeffs;
+
     if (av_frame_is_writable(in)) {
         out = in;
     } else {