From 2aece147d594f78afc969100c0fc637f4b1ebe86 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sun, 14 Mar 2021 13:06:50 +0100
Subject: [PATCH] avfilter/vf_xfade: drop unused frames from inactive inputs

---
 libavfilter/vf_xfade.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavfilter/vf_xfade.c b/libavfilter/vf_xfade.c
index 4e07d7b525..cb4fae21d9 100644
--- a/libavfilter/vf_xfade.c
+++ b/libavfilter/vf_xfade.c
@@ -1851,6 +1851,11 @@ static int xfade_activate(AVFilterContext *ctx)
     FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
 
     if (s->xfade_is_over) {
+        if (!s->eof[0]) {
+            ret = ff_inlink_consume_frame(ctx->inputs[0], &in);
+            if (ret > 0)
+                av_frame_free(&in);
+        }
         ret = ff_inlink_consume_frame(ctx->inputs[1], &in);
         if (ret < 0) {
             return ret;