diff --git a/src/Color.cpp b/src/Color.cpp
index e848f1f7..c877cbd4 100644
--- a/src/Color.cpp
+++ b/src/Color.cpp
@@ -28,6 +28,8 @@
  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <cmath>
+
 #include "Color.h"
 #include "Exceptions.h"
 
diff --git a/src/EffectBase.cpp b/src/EffectBase.cpp
index b75a0820..a475c7eb 100644
--- a/src/EffectBase.cpp
+++ b/src/EffectBase.cpp
@@ -28,6 +28,9 @@
  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <iostream>
+#include <iomanip>
+
 #include "EffectBase.h"
 
 #include "Exceptions.h"
@@ -57,16 +60,16 @@ void EffectBase::InitEffectInfo()
 }
 
 // Display file information
-void EffectBase::DisplayInfo() {
-	std::cout << std::fixed << std::setprecision(2) << std::boolalpha;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "----- Effect Information -----" << std::endl;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "--> Name: " << info.name << std::endl;
-	std::cout << "--> Description: " << info.description << std::endl;
-	std::cout << "--> Has Video: " << info.has_video << std::endl;
-	std::cout << "--> Has Audio: " << info.has_audio << std::endl;
-	std::cout << "----------------------------" << std::endl;
+void EffectBase::DisplayInfo(std::ostream* out) {
+	*out << std::fixed << std::setprecision(2) << std::boolalpha;
+	*out << "----------------------------" << std::endl;
+	*out << "----- Effect Information -----" << std::endl;
+	*out << "----------------------------" << std::endl;
+	*out << "--> Name: " << info.name << std::endl;
+	*out << "--> Description: " << info.description << std::endl;
+	*out << "--> Has Video: " << info.has_video << std::endl;
+	*out << "--> Has Audio: " << info.has_audio << std::endl;
+	*out << "----------------------------" << std::endl;
 }
 
 // Constrain a color value from 0 to 255
diff --git a/src/EffectBase.h b/src/EffectBase.h
index dc78a7c9..05936500 100644
--- a/src/EffectBase.h
+++ b/src/EffectBase.h
@@ -87,7 +87,7 @@ namespace openshot
 		EffectInfoStruct info;
 
 		/// Display effect information in the standard output stream (stdout)
-		void DisplayInfo();
+		void DisplayInfo(std::ostream* out=&std::cout);
 
 		/// Constrain a color value from 0 to 255
 		int constrain(int color_value);
diff --git a/src/FrameMapper.cpp b/src/FrameMapper.cpp
index 0e3b0272..832f794a 100644
--- a/src/FrameMapper.cpp
+++ b/src/FrameMapper.cpp
@@ -28,6 +28,10 @@
  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <cmath>
+#include <iostream>
+#include <iomanip>
+
 #include "FrameMapper.h"
 #include "Exceptions.h"
 #include "Clip.h"
@@ -611,7 +615,7 @@ std::shared_ptr<Frame> FrameMapper::GetFrame(int64_t requested_frame)
 	return final_cache.GetFrame(requested_frame);
 }
 
-void FrameMapper::PrintMapping()
+void FrameMapper::PrintMapping(std::ostream* out)
 {
 	// Check if mappings are dirty (and need to be recalculated)
 	if (is_dirty)
@@ -622,8 +626,16 @@ void FrameMapper::PrintMapping()
 	for (float map = 1; map <= frames.size(); map++)
 	{
 		MappedFrame frame = frames[map - 1];
-		cout << "Target frame #: " << map << " mapped to original frame #:\t(" << frame.Odd.Frame << " odd, " << frame.Even.Frame << " even)" << endl;
-		cout << "  - Audio samples mapped to frame " << frame.Samples.frame_start << ":" << frame.Samples.sample_start << " to frame " << frame.Samples.frame_end << ":" << frame.Samples.sample_end << endl;
+		*out << "Target frame #: " << map
+		     << " mapped to original frame #:\t("
+			 << frame.Odd.Frame << " odd, "
+			 << frame.Even.Frame << " even)" << std::endl;
+
+		*out << "  - Audio samples mapped to frame "
+		     << frame.Samples.frame_start << ":"
+			 << frame.Samples.sample_start << " to frame "
+			 << frame.Samples.frame_end << ":"
+			 << frame.Samples.sample_end << endl;
 	}
 
 }
diff --git a/src/FrameMapper.h b/src/FrameMapper.h
index 62615cfb..813c644f 100644
--- a/src/FrameMapper.h
+++ b/src/FrameMapper.h
@@ -33,9 +33,9 @@
 
 #include <assert.h>
 #include <iostream>
-#include <cmath>
 #include <vector>
 #include <memory>
+
 #include "CacheMemory.h"
 #include "ReaderBase.h"
 #include "Frame.h"
@@ -211,7 +211,7 @@ namespace openshot
 		void Open() override;
 
 		/// Print all of the original frames and which new frames they map to
-		void PrintMapping();
+		void PrintMapping(std::ostream* out=&std::cout);
 
 		/// Get the current reader
 		ReaderBase* Reader();
diff --git a/src/KeyFrame.cpp b/src/KeyFrame.cpp
index 4107f2de..ef8b045e 100644
--- a/src/KeyFrame.cpp
+++ b/src/KeyFrame.cpp
@@ -28,9 +28,6 @@
  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "KeyFrame.h"
-#include "Exceptions.h"
-
 #include <algorithm>
 #include <functional>
 #include <utility>
@@ -38,6 +35,9 @@
 #include <iostream>		 // For std::cout
 #include <iomanip>		 // For std::setprecision
 
+#include "KeyFrame.h"
+#include "Exceptions.h"
+
 using namespace std;
 using namespace openshot;
 
@@ -559,21 +559,21 @@ void Keyframe::UpdatePoint(int64_t index, Point p) {
 	AddPoint(p);
 }
 
-void Keyframe::PrintPoints() const {
-	cout << fixed << setprecision(4);
+void Keyframe::PrintPoints(std::ostream* out) const {
+	*out << std::fixed << std::setprecision(4);
 	for (std::vector<Point>::const_iterator it = Points.begin(); it != Points.end(); it++) {
 		Point p = *it;
-		cout << p.co.X << "\t" << p.co.Y << endl;
+		*out << p.co.X << "\t" << p.co.Y << std::endl;
 	}
 }
 
-void Keyframe::PrintValues() const {
-	cout << fixed << setprecision(4);
-	cout << "Frame Number (X)\tValue (Y)\tIs Increasing\tRepeat Numerator\tRepeat Denominator\tDelta (Y Difference)\n";
+void Keyframe::PrintValues(std::ostream* out) const {
+	*out << std::fixed << std::setprecision(4);
+	*out << "Frame Number (X)\tValue (Y)\tIs Increasing\tRepeat Numerator\tRepeat Denominator\tDelta (Y Difference)\n";
 
 	for (int64_t i = 1; i < GetLength(); ++i) {
-		cout << i << "\t" << GetValue(i) << "\t" << IsIncreasing(i) << "\t" ;
-		cout << GetRepeatFraction(i).num << "\t" << GetRepeatFraction(i).den << "\t" << GetDelta(i) << "\n";
+		*out << i << "\t" << GetValue(i) << "\t" << IsIncreasing(i) << "\t" ;
+		*out << GetRepeatFraction(i).num << "\t" << GetRepeatFraction(i).den << "\t" << GetDelta(i) << "\n";
 	}
 }
 
diff --git a/src/KeyFrame.h b/src/KeyFrame.h
index 6da34cac..45624dd2 100644
--- a/src/KeyFrame.h
+++ b/src/KeyFrame.h
@@ -31,7 +31,7 @@
 #ifndef OPENSHOT_KEYFRAME_H
 #define OPENSHOT_KEYFRAME_H
 
-#include <cmath>
+#include <iostream>
 #include <vector>
 
 #include "Fraction.h"
@@ -160,10 +160,10 @@ namespace openshot {
 		void UpdatePoint(int64_t index, Point p);
 
 		/// Print a list of points
-		void PrintPoints() const;
+		void PrintPoints(std::ostream* out=&std::cout) const;
 
 		/// Print just the Y value of the point's primary coordinate
-		void PrintValues() const;
+		void PrintValues(std::ostream* out=&std::cout) const;
 
 	};
 
diff --git a/src/WriterBase.cpp b/src/WriterBase.cpp
index fff93988..8faab981 100644
--- a/src/WriterBase.cpp
+++ b/src/WriterBase.cpp
@@ -28,6 +28,9 @@
  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <iostream>
+#include <iomanip>
+
 #include "WriterBase.h"
 #include "Exceptions.h"
 
@@ -100,43 +103,43 @@ void WriterBase::CopyReaderInfo(ReaderBase* reader)
 }
 
 // Display file information
-void WriterBase::DisplayInfo() {
-	std::cout << std::fixed << std::setprecision(2) << std::boolalpha;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "----- File Information -----" << std::endl;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "--> Has Video: " << info.has_video << std::endl;
-	std::cout << "--> Has Audio: " << info.has_audio << std::endl;
-	std::cout << "--> Has Single Image: " << info.has_single_image << std::endl;
-	std::cout << "--> Duration: " << info.duration << " Seconds" << std::endl;
-	std::cout << "--> File Size: " << double(info.file_size) / 1024 / 1024 << " MB" << std::endl;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "----- Video Attributes -----" << std::endl;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "--> Width: " << info.width << std::endl;
-	std::cout << "--> Height: " << info.height << std::endl;
-	std::cout << "--> Pixel Format: " << info.pixel_format << std::endl;
-	std::cout << "--> Frames Per Second: " << info.fps.ToDouble() << " (" << info.fps.num << "/" << info.fps.den << ")" << std::endl;
-	std::cout << "--> Video Bit Rate: " << info.video_bit_rate/1000 << " kb/s" << std::endl;
-	std::cout << "--> Pixel Ratio: " << info.pixel_ratio.ToDouble() << " (" << info.pixel_ratio.num << "/" << info.pixel_ratio.den << ")" << std::endl;
-	std::cout << "--> Display Aspect Ratio: " << info.display_ratio.ToDouble() << " (" << info.display_ratio.num << "/" << info.display_ratio.den << ")" << std::endl;
-	std::cout << "--> Video Codec: " << info.vcodec << std::endl;
-	std::cout << "--> Video Length: " << info.video_length << " Frames" << std::endl;
-	std::cout << "--> Video Stream Index: " << info.video_stream_index << std::endl;
-	std::cout << "--> Video Timebase: " << info.video_timebase.ToDouble() << " (" << info.video_timebase.num << "/" << info.video_timebase.den << ")" << std::endl;
-	std::cout << "--> Interlaced: " << info.interlaced_frame << std::endl;
-	std::cout << "--> Interlaced: Top Field First: " << info.top_field_first << std::endl;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "----- Audio Attributes -----" << std::endl;
-	std::cout << "----------------------------" << std::endl;
-	std::cout << "--> Audio Codec: " << info.acodec << std::endl;
-	std::cout << "--> Audio Bit Rate: " << info.audio_bit_rate/1000 << " kb/s" << std::endl;
-	std::cout << "--> Sample Rate: " << info.sample_rate << " Hz" << std::endl;
-	std::cout << "--> # of Channels: " << info.channels << std::endl;
-	std::cout << "--> Channel Layout: " << info.channel_layout << std::endl;
-	std::cout << "--> Audio Stream Index: " << info.audio_stream_index << std::endl;
-	std::cout << "--> Audio Timebase: " << info.audio_timebase.ToDouble() << " (" << info.audio_timebase.num << "/" << info.audio_timebase.den << ")" << std::endl;
-	std::cout << "----------------------------" << std::endl;
+void WriterBase::DisplayInfo(std::ostream* out) {
+	*out << std::fixed << std::setprecision(2) << std::boolalpha;
+	*out << "----------------------------" << std::endl;
+	*out << "----- File Information -----" << std::endl;
+	*out << "----------------------------" << std::endl;
+	*out << "--> Has Video: " << info.has_video << std::endl;
+	*out << "--> Has Audio: " << info.has_audio << std::endl;
+	*out << "--> Has Single Image: " << info.has_single_image << std::endl;
+	*out << "--> Duration: " << info.duration << " Seconds" << std::endl;
+	*out << "--> File Size: " << double(info.file_size) / 1024 / 1024 << " MB" << std::endl;
+	*out << "----------------------------" << std::endl;
+	*out << "----- Video Attributes -----" << std::endl;
+	*out << "----------------------------" << std::endl;
+	*out << "--> Width: " << info.width << std::endl;
+	*out << "--> Height: " << info.height << std::endl;
+	*out << "--> Pixel Format: " << info.pixel_format << std::endl;
+	*out << "--> Frames Per Second: " << info.fps.ToDouble() << " (" << info.fps.num << "/" << info.fps.den << ")" << std::endl;
+	*out << "--> Video Bit Rate: " << info.video_bit_rate/1000 << " kb/s" << std::endl;
+	*out << "--> Pixel Ratio: " << info.pixel_ratio.ToDouble() << " (" << info.pixel_ratio.num << "/" << info.pixel_ratio.den << ")" << std::endl;
+	*out << "--> Display Aspect Ratio: " << info.display_ratio.ToDouble() << " (" << info.display_ratio.num << "/" << info.display_ratio.den << ")" << std::endl;
+	*out << "--> Video Codec: " << info.vcodec << std::endl;
+	*out << "--> Video Length: " << info.video_length << " Frames" << std::endl;
+	*out << "--> Video Stream Index: " << info.video_stream_index << std::endl;
+	*out << "--> Video Timebase: " << info.video_timebase.ToDouble() << " (" << info.video_timebase.num << "/" << info.video_timebase.den << ")" << std::endl;
+	*out << "--> Interlaced: " << info.interlaced_frame << std::endl;
+	*out << "--> Interlaced: Top Field First: " << info.top_field_first << std::endl;
+	*out << "----------------------------" << std::endl;
+	*out << "----- Audio Attributes -----" << std::endl;
+	*out << "----------------------------" << std::endl;
+	*out << "--> Audio Codec: " << info.acodec << std::endl;
+	*out << "--> Audio Bit Rate: " << info.audio_bit_rate/1000 << " kb/s" << std::endl;
+	*out << "--> Sample Rate: " << info.sample_rate << " Hz" << std::endl;
+	*out << "--> # of Channels: " << info.channels << std::endl;
+	*out << "--> Channel Layout: " << info.channel_layout << std::endl;
+	*out << "--> Audio Stream Index: " << info.audio_stream_index << std::endl;
+	*out << "--> Audio Timebase: " << info.audio_timebase.ToDouble() << " (" << info.audio_timebase.num << "/" << info.audio_timebase.den << ")" << std::endl;
+	*out << "----------------------------" << std::endl;
 }
 
 // Generate JSON string of this object
diff --git a/src/WriterBase.h b/src/WriterBase.h
index d18f329d..3939ca6e 100644
--- a/src/WriterBase.h
+++ b/src/WriterBase.h
@@ -32,7 +32,7 @@
 #define OPENSHOT_WRITER_BASE_H
 
 #include <iostream>
-#include <iomanip>
+
 #include "ChannelLayouts.h"
 #include "Fraction.h"
 #include "Frame.h"
@@ -113,7 +113,7 @@ namespace openshot
 		void SetJsonValue(const Json::Value root); ///< Load Json::Value into this object
 
 		/// Display file information in the standard output stream (stdout)
-		void DisplayInfo();
+		void DisplayInfo(std::ostream* out=&std::cout);
 
 		/// Open the writer (and start initializing streams)
 		virtual void Open() = 0;