fixed #390

project/clip.cpp

@@ -227,7 +227,7 @@ double Clip::getMediaFrameRate() {
 }
 
 void Clip::recalculateMaxLength() {
-	if (sequence != nullptr) {
+	if (this->sequence != nullptr) {
 		double fr = this->sequence->frame_rate;
 
 		fr /= speed;

project/effect.h

@@ -165,7 +165,7 @@ public:
 
 	virtual void refresh();
 
-	Effect* copy(Clip* c);
+	virtual Effect* copy(Clip* c);
 	void copy_field_keyframes(Effect *e);
 
 	virtual void load(QXmlStreamReader& stream);