avfilter/avf_ahistogram: fix off by one in slide mode

1 files changed, 1 insertions, 1 deletions

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);
                 }