diff --git a/AirLib/include/common/AirSimSettings.hpp b/AirLib/include/common/AirSimSettings.hpp
index 694351f04b..921da43417 100644
--- a/AirLib/include/common/AirSimSettings.hpp
+++ b/AirLib/include/common/AirSimSettings.hpp
@@ -66,7 +66,7 @@ struct AirSimSettings {
         {
         }
 
-        RecordingSetting(bool record_on_move_val, float record_interval_val, std::string folder_val, bool enabled_val)
+        RecordingSetting(bool record_on_move_val, float record_interval_val, const std::string& folder_val, bool enabled_val)
             : record_on_move(record_on_move_val), record_interval(record_interval_val), folder(folder_val),
               enabled(enabled_val)
         {
@@ -124,7 +124,6 @@ struct AirSimSettings {
         // ShowFlag.VisualizeHDR 1.
         //to replicate camera settings_json to SceneCapture2D
         //TODO: should we use UAirBlueprintLib::GetDisplayGamma()?
-        typedef msr::airlib::Utils Utils;
         static constexpr float kSceneTargetGamma = 1.4f;
 
         int image_type = 0;
@@ -621,7 +620,6 @@ struct AirSimSettings {
                 // Map contains a default vehicle if vehicles haven't been specified
                 std::string default_vehicle_name = vehicles.begin()->first;
 
-
                 for (size_t child_index = 0; child_index < req_cameras_settings.size(); ++child_index) {
                     Settings req_camera_settings;
 
diff --git a/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.cpp b/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.cpp
index 3cad043b16..9e158ff9f0 100644
--- a/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.cpp
+++ b/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.cpp
@@ -7,16 +7,17 @@
 #include "common/common_utils/FileSystem.hpp"
 
 
-void RecordingFile::appendRecord(const std::vector<msr::airlib::ImageCaptureBase::ImageResponse>& responses, msr::airlib::VehicleSimApiBase* vehicle_sim_api)
+void RecordingFile::appendRecord(const std::vector<msr::airlib::ImageCaptureBase::ImageResponse>& responses,
+    msr::airlib::VehicleSimApiBase* vehicle_sim_api) const
 {
     bool save_success = false;
-    std::stringstream image_file_names;
+    std::ostringstream image_file_names;
 
     for (auto i = 0; i < responses.size(); ++i) {
         const auto& response = responses.at(i);
 
         //build image file name
-        std::stringstream image_file_name;
+        std::ostringstream image_file_name;
         image_file_name << "img_"
             << vehicle_sim_api->getVehicleName() << "_" 
             << response.camera_name << "_" <<
@@ -69,7 +70,6 @@ void RecordingFile::appendRecord(const std::vector<msr::airlib::ImageCaptureBase
         writeString(vehicle_sim_api->getRecordFileLine(false).append(image_file_names.str()).append("\n"));
 
         //UAirBlueprintLib::LogMessage(TEXT("Screenshot saved to:"), filePath, LogDebugLevel::Success);
-        images_saved_++;
     }
 }
 
@@ -92,7 +92,7 @@ void RecordingFile::createFile(const std::string& file_path, const std::string&
     }
 }
 
-bool RecordingFile::isFileOpen()
+bool RecordingFile::isFileOpen() const
 {
     return log_file_handle_ != nullptr;
 }
@@ -105,11 +105,11 @@ void RecordingFile::closeFile()
     log_file_handle_ = nullptr;
 }
 
-void RecordingFile::writeString(const std::string& str)
+void RecordingFile::writeString(const std::string& str) const
 {
     try {    
         if (log_file_handle_) {
-            FString line_f = FString(str.c_str());
+            FString line_f(str.c_str());
             log_file_handle_->Write((const uint8*)TCHAR_TO_ANSI(*line_f), line_f.Len());
         }
         else
@@ -167,7 +167,7 @@ void RecordingFile::stopRecording(bool ignore_if_stopped)
     UAirBlueprintLib::LogMessage(TEXT("Data saved to: "), FString(image_path_.c_str()), LogDebugLevel::Success);
 }
 
-bool RecordingFile::isRecording()
+bool RecordingFile::isRecording() const
 {
     return is_recording_;
 }
diff --git a/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.h b/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.h
index a5f82265b9..e094b07006 100644
--- a/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.h
+++ b/Unreal/Plugins/AirSim/Source/Recording/RecordingFile.h
@@ -12,21 +12,20 @@ class RecordingFile {
 public:
     ~RecordingFile();
 
-    void appendRecord(const std::vector<msr::airlib::ImageCaptureBase::ImageResponse>& responses, msr::airlib::VehicleSimApiBase* vehicle_sim_api);
+    void appendRecord(const std::vector<msr::airlib::ImageCaptureBase::ImageResponse>& responses, msr::airlib::VehicleSimApiBase* vehicle_sim_api) const;
     void appendColumnHeader(const std::string& header_columns);
     void startRecording(msr::airlib::VehicleSimApiBase* vehicle_sim_api, const std::string& folder="");
     void stopRecording(bool ignore_if_stopped);
-    bool isRecording();
+    bool isRecording() const;
 
 private:
     void createFile(const std::string& file_path, const std::string& header_columns);
     void closeFile();
-    void writeString(const std::string& line);
-    bool isFileOpen();
+    void writeString(const std::string& line) const;
+    bool isFileOpen() const;
 
 private:
-    std::string record_filename = "airsim_rec";     
-    unsigned int images_saved_ = 0;
+    std::string record_filename = "airsim_rec";
     std::string image_path_;
     bool is_recording_ = false;
     IFileHandle* log_file_handle_ = nullptr;