default to gstreamer backend for linux (#1140)

* Default to gstreamer backend to prevent capture card flickering

* default auto-reset to 0 on linux builds to prevent black frames on reset

* another comment

Author: ConnorC432

SerialPrograms/Source/CommonFramework/Main.cpp

@@ -201,6 +201,14 @@ int main(int argc, char *argv[]){
     set_program_path(argv[0]);
 #endif
 
+#if defined(__linux__)
+    // Qt multimedia, default to gstreamer to prevent flickering
+    // Easier than the alternative which is compiling qt6multimedia with QT_DEFAULT_MEDIA_BACKEND
+    // See: https://doc.qt.io/qt-6.5/qtmultimedia-index.html
+    if (qEnvironmentVariableIsEmpty("QT_MEDIA_BACKEND"))
+        qputenv("QT_MEDIA_BACKEND", "gstreamer");
+#endif
+
     //  So far, this is only needed on Mac where static initialization is fucked up.
     PokemonAutomation::register_all_statics();
 

SerialPrograms/Source/CommonFramework/VideoPipeline/VideoPipelineOptions.h

@@ -34,9 +34,13 @@ class VideoPipelineOptions : public GroupOption{
         , AUTO_RESET_SECONDS(
             "<b>Video Auto-Reset:</b><br>"
             "Attempt to reset the video if this many seconds has elapsed since the last video frame (in order to fix issues with RDP disconnection, etc).<br>"
-            "This option is not supported by all video frameworks.",
+            "This option is not supported by all video frameworks. Set to a value of 0 to disable Auto-Reset.",
             LockMode::UNLOCK_WHILE_RUNNING,
+#if defined(__linux__)
+            0 // Default to disabled on linux, auto-resets briefly output black frames
+#else
             5
+#endif
         )
     {
         PA_ADD_OPTION(VIDEO_BACKEND);