From c4b6d0da3865d49c5c3df78902f6c4cc51cbcdbf Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Fri, 3 May 2024 23:32:52 +0200
Subject: [PATCH] f_lavfi: reject filters with too many in/outs

The pad count serves as a minimum even if the filter has
dynamic inputs/outputs, so we should reject them here.

At least on FFmpeg 6.1 this results in no practical change
in the list accepted filters.

fixes: 8bf3fe7e2a05809103527fa3d2a0fd8eeed3ef2a
---
 filters/f_lavfi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/filters/f_lavfi.c b/filters/f_lavfi.c
index afc9f2d445..982e7ea6fa 100644
--- a/filters/f_lavfi.c
+++ b/filters/f_lavfi.c
@@ -987,6 +987,8 @@ static bool is_usable(const AVFilter *filter, int media_type)
     int nb_inputs  = avfilter_pad_count(filter->inputs),
         nb_outputs = avfilter_pad_count(filter->outputs);
 #endif
+    if (nb_inputs > 1 || nb_outputs > 1)
+        return false;
     bool input_ok = filter->flags & AVFILTER_FLAG_DYNAMIC_INPUTS;
     bool output_ok = filter->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS;
     if (nb_inputs == 1)