From 22d6d916494498cb6a7a1f8abb5d73f0030b4f78 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Wed, 24 Oct 2018 18:30:38 +0200
Subject: [PATCH] avfilter/vf_waveform: abort early if there are no components
 to show

---
 libavfilter/vf_waveform.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavfilter/vf_waveform.c b/libavfilter/vf_waveform.c
index b4661e0..8033628 100644
--- a/libavfilter/vf_waveform.c
+++ b/libavfilter/vf_waveform.c
@@ -3025,6 +3025,9 @@ static int config_output(AVFilterLink *outlink)
             comp++;
     }
     s->acomp = comp;
+    if (s->acomp == 0)
+        return AVERROR(EINVAL);
+
     s->odesc = av_pix_fmt_desc_get(outlink->format);
     s->dcomp = s->odesc->nb_components;
 
-- 
2.7.4