From 7ae2ded0d12bb36a82ee928c3a543a00aee4b466 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sat, 19 Mar 2022 10:50:56 +0100
Subject: [PATCH] avfilter/avf_ahistogram: fix off by one in slide mode

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

diff --git a/libavfilter/avf_ahistogram.c b/libavfilter/avf_ahistogram.c
index 71b0cdf04c..ebd4949b3d 100644
--- a/libavfilter/avf_ahistogram.c
+++ b/libavfilter/avf_ahistogram.c
@@ -400,7 +400,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
         if (s->slide == SCROLL) {
             for (p = 0; p < 4; p++) {
-                for (y = s->h; y >= H + 1; y--) {
+                for (y = s->h - 1; y >= H + 1; y--) {
                     memmove(s->out->data[p] + (y  ) * s->out->linesize[p],
                             s->out->data[p] + (y-1) * s->out->linesize[p], w);
                 }