diff --git a/include/ImageReader.h b/include/ImageReader.h
index b02d2f04..a081b03d 100644
--- a/include/ImageReader.h
+++ b/include/ImageReader.h
@@ -73,7 +73,7 @@ namespace openshot
 	class ImageReader : public ReaderBase
 	{
 	private:
-		string path;
+		std::string path;
 		std::shared_ptr<Magick::Image> image;
 		bool is_open;
 
@@ -81,12 +81,12 @@ namespace openshot
 
 		/// Constructor for ImageReader.  This automatically opens the media file and loads
 		/// frame 1, or it throws one of the following exceptions.
-		ImageReader(string path);
+		ImageReader(std::string path);
 
 		/// Constructor for ImageReader.  This only opens the media file to inspect its properties
 		/// if inspect_reader=true. When not inspecting the media file, it's much faster, and useful
 		/// when you are inflating the object using JSON after instantiating it.
-		ImageReader(string path, bool inspect_reader);
+		ImageReader(std::string path, bool inspect_reader);
 
 		/// Close File
 		void Close();
@@ -105,11 +105,11 @@ namespace openshot
 		bool IsOpen() { return is_open; };
 
 		/// Return the type name of the class
-		string Name() { return "ImageReader"; };
+		std::string Name() { return "ImageReader"; };
 
 		/// Get and Set JSON methods
-		string Json(); ///< Generate JSON string of this object
-		void SetJson(string value); ///< Load JSON string into this object
+		std::string Json(); ///< Generate JSON string of this object
+		void SetJson(std::string value); ///< Load JSON string into this object
 		Json::Value JsonValue(); ///< Generate Json::JsonValue for this object
 		void SetJsonValue(Json::Value root); ///< Load Json::JsonValue into this object
 
diff --git a/include/ImageWriter.h b/include/ImageWriter.h
index c1d2726a..87e8a9a9 100644
--- a/include/ImageWriter.h
+++ b/include/ImageWriter.h
@@ -53,8 +53,6 @@
 #include "OpenMPUtilities.h"
 #include "MagickUtilities.h"
 
-using namespace std;
-
 namespace openshot
 {
 
@@ -88,12 +86,12 @@ namespace openshot
 	class ImageWriter : public WriterBase
 	{
 	private:
-		string path;
+		std::string path;
 		int cache_size;
 		bool is_writing;
 		bool is_open;
 		int64_t write_video_count;
-		vector<Magick::Image> frames;
+		std::vector<Magick::Image> frames;
 		int image_quality;
 		int number_of_loops;
 		bool combine_frames;
@@ -104,7 +102,7 @@ namespace openshot
 
 		/// @brief Constructor for ImageWriter. Throws one of the following exceptions.
 		/// @param path The path of the file you want to create
-		ImageWriter(string path);
+		ImageWriter(std::string path);
 
 		/// @brief Close the writer and encode/output final image to the disk. This is a requirement of ImageMagick,
 		/// which writes all frames of a multi-frame image at one time.
@@ -131,7 +129,7 @@ namespace openshot
 		/// @param quality Quality of image (0 to 100, 70 is default)
 		/// @param loops Number of times to repeat the image (used on certain multi-frame image formats, such as GIF)
 		/// @param combine Combine frames into a single image (if possible), or save each frame as its own image
-		void SetVideoOptions(string format, Fraction fps, int width, int height,
+		void SetVideoOptions(std::string format, Fraction fps, int width, int height,
 				int quality, int loops, bool combine);
 
 		/// @brief Add a frame to the stack waiting to be encoded.
diff --git a/src/ImageReader.cpp b/src/ImageReader.cpp
index a0b7e8f3..42dd58d6 100644
--- a/src/ImageReader.cpp
+++ b/src/ImageReader.cpp
@@ -35,14 +35,14 @@
 
 using namespace openshot;
 
-ImageReader::ImageReader(string path) : path(path), is_open(false)
+ImageReader::ImageReader(std::string path) : path(path), is_open(false)
 {
 	// Open and Close the reader, to populate its attributes (such as height, width, etc...)
 	Open();
 	Close();
 }
 
-ImageReader::ImageReader(string path, bool inspect_reader) : path(path), is_open(false)
+ImageReader::ImageReader(std::string path, bool inspect_reader) : path(path), is_open(false)
 {
 	// Open and Close the reader, to populate its attributes (such as height, width, etc...)
 	if (inspect_reader) {
@@ -136,7 +136,7 @@ std::shared_ptr<Frame> ImageReader::GetFrame(int64_t requested_frame)
 }
 
 // Generate JSON string of this object
-string ImageReader::Json() {
+std::string ImageReader::Json() {
 
 	// Return formatted string
 	return JsonValue().toStyledString();
@@ -155,14 +155,14 @@ Json::Value ImageReader::JsonValue() {
 }
 
 // Load JSON string into this object
-void ImageReader::SetJson(string value) {
+void ImageReader::SetJson(std::string value) {
 
 	// Parse JSON string into JSON objects
 	Json::Value root;
 	Json::CharReaderBuilder rbuilder;
 	Json::CharReader* reader(rbuilder.newCharReader());
 
-	string errors;
+	std::string errors;
 	bool success = reader->parse( value.c_str(),
                  value.c_str() + value.size(), &root, &errors );
 	delete reader;
diff --git a/src/ImageWriter.cpp b/src/ImageWriter.cpp
index 2b1e3fc0..376feb62 100644
--- a/src/ImageWriter.cpp
+++ b/src/ImageWriter.cpp
@@ -38,7 +38,7 @@
 
 using namespace openshot;
 
-ImageWriter::ImageWriter(string path) :
+ImageWriter::ImageWriter(std::string path) :
 		path(path), cache_size(8), is_writing(false), write_video_count(0), image_quality(75), number_of_loops(1),
 		combine_frames(true), is_open(false)
 {
@@ -48,7 +48,7 @@ ImageWriter::ImageWriter(string path) :
 }
 
 // Set video export options
-void ImageWriter::SetVideoOptions(string format, Fraction fps, int width, int height,
+void ImageWriter::SetVideoOptions(std::string format, Fraction fps, int width, int height,
 		int quality, int loops, bool combine)
 {
 	// Set frames per second (if provided)