From 2f0035b23ff3789eebbddbfd94dd4deef0cb0bd8 Mon Sep 17 00:00:00 2001
From: Vincent Rabaud <vrabaud@google.com>
Date: Thu, 2 Jan 2025 22:53:06 +0100
Subject: [PATCH] Fix flaky Imgcodecs_APNG.imwriteanimation_bgcolor

---
 modules/imgcodecs/src/grfmt_png.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/imgcodecs/src/grfmt_png.cpp b/modules/imgcodecs/src/grfmt_png.cpp
index 32620fdbc0..e8b5fcedd4 100644
--- a/modules/imgcodecs/src/grfmt_png.cpp
+++ b/modules/imgcodecs/src/grfmt_png.cpp
@@ -1444,7 +1444,7 @@ bool PngEncoder::writeanimation(const Animation& animation, const std::vector<in
 
         if (i > 0 && !getRect(width, height, frames.back().getPixels(), apngFrame.getPixels(), over1.data(), bpp, rowbytes, 0, 0, 0, 3))
         {
-            frames[i - 1].setDelayNum(frames.back().getDelayNum() + apngFrame.getDelayNum());
+            frames.back().setDelayNum(frames.back().getDelayNum() + apngFrame.getDelayNum());
             num_frames--;
         }
         else