Don't load camera on the main thread. Preload them.

Author: Mysticial

SerialPrograms/Source/CommonFramework/Main.cpp

@@ -7,6 +7,8 @@
 #include "Common/Cpp/Concurrency/AsyncTask.h"
 #include "Common/Cpp/Exceptions.h"
 #include "Common/Cpp/ImageResolution.h"
+#include "Globals.h"
+#include "GlobalSettingsPanel.h"
 #include "PersistentSettings.h"
 #include "Tests/CommandLineTests.h"
 #include "ErrorReports/ProgramDumper.h"
@@ -18,11 +20,10 @@
 #include "Logging/Logger.h"
 #include "Logging/OutputRedirector.h"
 //#include "Tools/StatsDatabase.h"
-#include "Globals.h"
-#include "GlobalSettingsPanel.h"
 //#include "Windows/DpiScaler.h"
 #include "Startup/SetupSettings.h"
 #include "Startup/NewVersionCheck.h"
+#include "CommonFramework/VideoPipeline/Backends/CameraImplementations.h"
 #include "CommonTools/OCR/OCR_RawOCR.h"
 #include "Windows/MainWindow.h"
 
@@ -73,6 +74,9 @@ int main(int argc, char *argv[]){
     OutputRedirector redirect_stdout(std::cout, "stdout", Color());
     OutputRedirector redirect_stderr(std::cerr, "stderr", COLOR_RED);
 
+    //  Preload all the cameras now so we don't hang the UI later on.
+    get_all_cameras();
+
     QDir().mkpath(QString::fromStdString(SETTINGS_PATH()));
     QDir().mkpath(QString::fromStdString(SCREENSHOTS_PATH()));
 

SerialPrograms/Source/CommonFramework/VideoPipeline/Backends/MediaServicesQt6.cpp

@@ -26,7 +26,7 @@ GlobalMediaServices::~GlobalMediaServices(){
 GlobalMediaServices::GlobalMediaServices()
     : m_refresh_cameras(true)
 {
-    refresh_cameras();
+//    refresh_cameras();
 
     m_media_devices.connect(
         &m_media_devices, &QMediaDevices::videoInputsChanged,