重新改进支持Qt4.6-Qt6.1

ffmpegdemo/ffmpegdemo.pro

@@ -1,6 +1,13 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2019-02-16T15:08:47
+#
+#-------------------------------------------------
+
 QT       += core gui
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+greaterThan(QT_MAJOR_VERSION, 5): QT += core5compat
 android {QT += androidextras}
 
 TARGET      = ffmpegdemo

ffmpegdemo/main.cpp

@@ -1,9 +1,7 @@
 #pragma execution_character_set("utf-8")
 #include "widget.h"
-
 #include <QApplication>
 #include <QTextCodec>
-#include <QDesktopWidget>
 
 int main(int argc, char *argv[])
 {
@@ -35,12 +33,5 @@ int main(int argc, char *argv[])
     w.setWindowTitle("视频流播放ffmpeg内核 (QQ: 517216493)");
     w.show();
 
-    //居中显示窗体
-    QDesktopWidget deskWidget;
-    int deskWidth = deskWidget.availableGeometry().width();
-    int deskHeight = deskWidget.availableGeometry().height();
-    QPoint movePoint(deskWidth / 2 - w.width() / 2, deskHeight / 2 - w.height() / 2);
-    w.move(movePoint);
-
     return a.exec();
 }