From 4f9ef00fe52a77f67ff5ef191ddb7e05ee4c7ec3 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Tue, 16 Aug 2022 16:26:11 +0200
Subject: lavfi/avf_ahistogram: set frame durations

The filter is supposed to produce CFR output.
---
 libavfilter/avf_ahistogram.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavfilter/avf_ahistogram.c b/libavfilter/avf_ahistogram.c
index d14e0bcfac..c45493730d 100644
--- a/libavfilter/avf_ahistogram.c
+++ b/libavfilter/avf_ahistogram.c
@@ -245,6 +245,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         memset(s->out->data[3] + n * s->out->linesize[0], 0, w);
     }
     s->out->pts = av_rescale_q(in->pts, inlink->time_base, outlink->time_base);
+    s->out->duration = 1;
 
     s->first = s->frame_count;
 
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