diff --git a/.gitignore b/.gitignore
index ef29265..74a106c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,4 @@ client/janus_gateway_win/x64/
 client/janus_gateway_win/janus_win/x64/
 client/janus_gateway_win/.vs/
 client/janus_gateway_win/usocket_test/x64/
+client/build-webrtc_capture-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug/
diff --git a/client/webrtc_capture/src/mainwindow.cpp b/client/webrtc_capture/src/mainwindow.cpp
index df70662..b65773c 100644
--- a/client/webrtc_capture/src/mainwindow.cpp
+++ b/client/webrtc_capture/src/mainwindow.cpp
@@ -149,14 +149,11 @@ cv::Mat *QImage2cvMat(QImage image)
     case QImage::Format_ARGB32_Premultiplied:
         mat = new cv::Mat(image.height(),
                       image.width(),
-                      CV_8UC4,
-                      image.bits(),
-                      image.bytesPerLine());
+                      CV_8UC4);
         memcpy(mat->data,image.bits(),image.bytesPerLine()*image.height());
         break;
     case QImage::Format_RGB888:
         mat = new cv::Mat(image.height(), image.width(), CV_8UC3, (void*)image.bits(), image.bytesPerLine());
-//        cv::cvtColor(mat, mat, CV_BGR2RGB);
         break;
     case QImage::Format_Indexed8:
         mat = new cv::Mat(image.height(), image.width(), CV_8UC1, (void*)image.bits(), image.bytesPerLine());
@@ -177,14 +174,13 @@ void MainWindow::on_pushButton_2_clicked()
     qDebug()<<"format is "<<image.format();
 //    cv::Mat Img;
 
-//    Img.create(pix.height()*3/2,
-//                   pix.width(), CV_8UC1);
-//    memcpy(Img.data, pix.data_ptr().data(),
-//           pix.height()*pix.width()*sizeof(unsigned char)*3/2);
-//    qDebug()<<"pixmap size is "<<pix.size();
     cv::Mat pic =  *QImage2cvMat(image);
-//    qDebug()<<pic.size().width<<image.size();
-    cv::imshow("img", pic);
+    try{
+        cv::imshow("img", pic);
+    }catch (std::exception &e){
+        qDebug()<<e.what();
+    }
+
     cv::waitKey(1);
     this->processed_picture->setPixmap(QPixmap::fromImage(image));
 }