From de07c57d5ad092c24fca874bd480854d9c07a1d3 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Fri, 4 Mar 2022 13:39:08 +0100
Subject: [PATCH] avfilter/avf_ahistogram: make frame writable before writing
 to it

---
 libavfilter/avf_ahistogram.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavfilter/avf_ahistogram.c b/libavfilter/avf_ahistogram.c
index 258b062873..7ae5dd180a 100644
--- a/libavfilter/avf_ahistogram.c
+++ b/libavfilter/avf_ahistogram.c
@@ -181,6 +181,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         }
     }
 
+    av_frame_make_writable(s->out);
     if (s->dmode == SEPARATE) {
         for (y = 0; y < w; y++) {
             s->combine_buffer[3 * y    ] = 0;