UI: Disallow closing settings without selected codec or format

UI/data/locale/en-US.ini

@@ -1335,6 +1335,10 @@ OutputWarnings.CodecIncompatible="The audio or video encoder selection was reset
 CodecCompat.Incompatible="(Incompatible with %1)"
 CodecCompat.CodecPlaceholder="Select Encoder..."
 CodecCompat.ContainerPlaceholder="Select Format..."
+CodecCompat.CodecMissingOnExit.Title="No Encoder Selected"
+CodecCompat.CodecMissingOnExit.Text="At least one video or audio encoder is not set. Please make sure to select encoders for both recording and streaming."
+CodecCompat.ContainerMissingOnExit.Title="No Format Selected"
+CodecCompat.ContainerMissingOnExit.Text="No recording format has been selected. Please select a recording format that is compatible with the selected stream encoder."
 
 # deleting final scene
 FinalScene.Title="Delete Scene"

UI/window-basic-settings.cpp

@@ -4197,6 +4197,9 @@ bool OBSBasicSettings::QueryChanges()
 	if (button == QMessageBox::Cancel) {
 		return false;
 	} else if (button == QMessageBox::Yes) {
+		if (!QueryAllowedToClose())
+			return false;
+
 		SaveSettings();
 	} else {
 		if (savedTheme != App()->GetTheme())
@@ -4210,6 +4213,44 @@ bool OBSBasicSettings::QueryChanges()
 	return true;
 }
 
+bool OBSBasicSettings::QueryAllowedToClose()
+{
+	bool simple = (ui->outputMode->currentIndex() == 0);
+
+	bool invalidEncoder = false;
+	bool invalidFormat = false;
+	if (simple) {
+		if (ui->simpleOutRecEncoder->currentIndex() == -1 ||
+		    ui->simpleOutStrEncoder->currentIndex() == -1 ||
+		    ui->simpleOutRecAEncoder->currentIndex() == -1 ||
+		    ui->simpleOutStrAEncoder->currentIndex() == -1)
+			invalidEncoder = true;
+
+		if (ui->simpleOutRecFormat->currentIndex() == -1)
+			invalidFormat = true;
+	} else {
+		if (ui->advOutRecEncoder->currentIndex() == -1 ||
+		    ui->advOutEncoder->currentIndex() == -1 ||
+		    ui->advOutRecAEncoder->currentIndex() == -1 ||
+		    ui->advOutAEncoder->currentIndex() == -1)
+			invalidEncoder = true;
+	}
+
+	if (invalidEncoder) {
+		OBSMessageBox::warning(
+			this, QTStr("CodecCompat.CodecMissingOnExit.Title"),
+			QTStr("CodecCompat.CodecMissingOnExit.Text"));
+		return false;
+	} else if (invalidFormat) {
+		OBSMessageBox::warning(
+			this, QTStr("CodecCompat.ContainerMissingOnExit.Title"),
+			QTStr("CodecCompat.ContainerMissingOnExit.Text"));
+		return false;
+	}
+
+	return true;
+}
+
 void OBSBasicSettings::closeEvent(QCloseEvent *event)
 {
 	if (!AskIfCanCloseSettings())
@@ -4259,6 +4300,9 @@ void OBSBasicSettings::on_buttonBox_clicked(QAbstractButton *button)
 
 	if (val == QDialogButtonBox::ApplyRole ||
 	    val == QDialogButtonBox::AcceptRole) {
+		if (!QueryAllowedToClose())
+			return;
+
 		SaveSettings();
 		ClearChanged();
 	}

UI/window-basic-settings.hpp

@@ -224,6 +224,7 @@ private:
 	void HookWidget(QWidget *widget, const char *signal, const char *slot);
 
 	bool QueryChanges();
+	bool QueryAllowedToClose();
 
 	void ResetEncoders(bool streamOnly = false);
 	void LoadColorRanges();