From 9f716422ef2875132b51d0a28a8488ff29eebd8c Mon Sep 17 00:00:00 2001
From: kallaballa <amir@viel-zu.org>
Date: Tue, 11 Apr 2023 18:46:51 +0200
Subject: [PATCH] directly copy the menu frame in optflow

---
 modules/viz2d/samples/cpp/optflow/optflow-demo.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/modules/viz2d/samples/cpp/optflow/optflow-demo.cpp b/modules/viz2d/samples/cpp/optflow/optflow-demo.cpp
index 7e10ea0d7..b7e1f7879 100644
--- a/modules/viz2d/samples/cpp/optflow/optflow-demo.cpp
+++ b/modules/viz2d/samples/cpp/optflow/optflow-demo.cpp
@@ -449,9 +449,8 @@ bool iteration() {
 #ifndef __EMSCRIPTEN__
     v2d->write();
 
-    v2dMenu->capture([=](cv::OutputArray& videoFrame) {
-        cv::UMat m = videoFrame.getUMat();
-        menuFrame.copyTo(m);
+    v2dMenu->capture([=](cv::UMat& videoFrame) {
+        menuFrame.copyTo(videoFrame);
     });
 
     if(!v2dMenu->display())