diff --git a/include/CacheBase.h b/include/CacheBase.h
index af24b153..12108680 100644
--- a/include/CacheBase.h
+++ b/include/CacheBase.h
@@ -114,6 +114,7 @@ namespace openshot {
 		virtual void SetJson(string value) = 0; ///< Load JSON string into this object
 		virtual Json::Value JsonValue() = 0; ///< Generate Json::JsonValue for this object
 		virtual void SetJsonValue(Json::Value root) = 0; ///< Load Json::JsonValue into this object
+		virtual ~CacheBase() = default;
 
 	};
 
diff --git a/include/ClipBase.h b/include/ClipBase.h
index adbf11ef..05f2747e 100644
--- a/include/ClipBase.h
+++ b/include/ClipBase.h
@@ -105,6 +105,7 @@ namespace openshot {
 		/// of all properties at any time)
 		virtual string PropertiesJSON(int64_t requested_frame) = 0;
 
+		virtual ~ClipBase() = default;
 	};
 
 
diff --git a/include/EffectBase.h b/include/EffectBase.h
index cd39c272..430c66bd 100644
--- a/include/EffectBase.h
+++ b/include/EffectBase.h
@@ -108,6 +108,7 @@ namespace openshot
 
 		/// Set the order that this effect should be executed.
 		void Order(int new_order) { order = new_order; }
+		virtual ~EffectBase() = default;
 	};
 
 }
diff --git a/include/PlayerBase.h b/include/PlayerBase.h
index ecc8f5f2..f017c3f2 100644
--- a/include/PlayerBase.h
+++ b/include/PlayerBase.h
@@ -107,6 +107,7 @@ namespace openshot
 		/// Set the Volume (1.0 = normal volume, <1.0 = quieter, >1.0 louder)
 		virtual void Volume(float new_volume) = 0;
 
+		virtual ~PlayerBase() = default;
 	};
 
 }
diff --git a/include/ReaderBase.h b/include/ReaderBase.h
index 4579ebb6..b2e8f19e 100644
--- a/include/ReaderBase.h
+++ b/include/ReaderBase.h
@@ -152,6 +152,8 @@ namespace openshot
 
 		/// Open the reader (and start consuming resources, such as images or video files)
 		virtual void Open() = 0;
+
+		virtual ~ReaderBase() = default;
 	};
 
 }
diff --git a/include/WriterBase.h b/include/WriterBase.h
index e03263ed..7620da64 100644
--- a/include/WriterBase.h
+++ b/include/WriterBase.h
@@ -119,6 +119,8 @@ namespace openshot
 
 		/// Open the writer (and start initializing streams)
 		virtual void Open() = 0;
+
+		virtual ~WriterBase() = default;
 	};
 
 }
diff --git a/src/AudioResampler.cpp b/src/AudioResampler.cpp
index 3aafb75d..d9c5a609 100644
--- a/src/AudioResampler.cpp
+++ b/src/AudioResampler.cpp
@@ -77,9 +77,9 @@ AudioResampler::~AudioResampler()
 void AudioResampler::SetBuffer(AudioSampleBuffer *new_buffer, double sample_rate, double new_sample_rate)
 {
 	if (sample_rate <= 0)
-		sample_rate == 44100;
+		sample_rate = 44100;
 	if (new_sample_rate <= 0)
-		new_sample_rate == 44100;
+		new_sample_rate = 44100;
 
 	// Set the sample ratio (the ratio of sample rate change)
 	source_ratio = sample_rate / new_sample_rate;
diff --git a/src/KeyFrame.cpp b/src/KeyFrame.cpp
index 71b785fa..31393d17 100644
--- a/src/KeyFrame.cpp
+++ b/src/KeyFrame.cpp
@@ -786,7 +786,7 @@ void Keyframe::ProcessSegment(int Segment, Point p1, Point p2) {
 					// Add new value to the vector
 					Coordinate new_coord(current_frame, current_value);
 
-					if (Segment == 0 || Segment > 0 && current_frame > p1.co.X)
+					if (Segment == 0 || (Segment > 0 && current_frame > p1.co.X))
 						// Add to "values" vector
 						Values.push_back(new_coord);
 
diff --git a/src/QtImageReader.cpp b/src/QtImageReader.cpp
index 4ed258a0..833664c8 100644
--- a/src/QtImageReader.cpp
+++ b/src/QtImageReader.cpp
@@ -220,7 +220,7 @@ std::shared_ptr<Frame> QtImageReader::GetFrame(int64_t requested_frame)
 	}
 
 	// Scale image smaller (or use a previous scaled image)
-	if (!cached_image || (cached_image && max_size.width() != max_width || max_size.height() != max_height)) {
+	if (!cached_image || (max_size.width() != max_width || max_size.height() != max_height)) {
 #if USE_RESVG == 1
 		// If defined and found in CMake, utilize the libresvg for parsing
 		// SVG files and rasterizing them to QImages.