Fixed pause button by making VideoImpl::setPlayState virtual

Author: sofian

src/core/VideoImpl.h

@@ -81,7 +81,7 @@ class VideoImpl
   /// Loads a new media source. Subclasses override to set up their player.
   virtual bool loadMovie(const QString& filename);
 
-  bool setPlayState(bool play);
+  virtual bool setPlayState(bool play);
   bool getPlayState() const { return _playState; }
 
   bool seekIsEnabled() const { return _seekEnabled; }

src/core/VideoPlayerImpl.h

@@ -40,7 +40,7 @@ class VideoPlayerImpl : public QObject, public VideoImpl
   bool loadMovie(const QString& path) override;
   bool isLive() override { return false; }
 
-  bool setPlayState(bool play);
+  bool setPlayState(bool play) override;
   bool seekTo(qint64 positionMs) override;
   void setRate(double rate) override;
   void setVolume(double volume) override;