Fix compilation warning

src/audiomixer/mixerwidget.cpp

@@ -82,9 +82,9 @@ static inline int fromDB(double level)
     return value;
 }
 
-void MixerWidget::property_changed( mlt_service , MixerWidget *widget, char *name )
+void MixerWidget::property_changed( mlt_service , MixerWidget *widget, mlt_event_data data )
 {
-    if (widget && !strcmp(name, "_position")) {
+    if (widget && !strcmp(Mlt::EventData(data).to_string(), "_position")) {
         mlt_properties filter_props = MLT_FILTER_PROPERTIES( widget->m_monitorFilter->get_filter());
         int pos = mlt_properties_get_int(filter_props, "_position");
         if (!widget->m_levels.contains(pos)) {
@@ -542,7 +542,7 @@ void MixerWidget::connectMixer(bool doConnect)
 {
     if (doConnect) {
         if (m_listener == nullptr) {
-            m_listener = m_monitorFilter->listen("property-changed", this, mlt_listener(property_changed));
+            m_listener = m_monitorFilter->listen("property-changed", this, reinterpret_cast<mlt_listener>(property_changed));
         }
     } else {
         delete m_listener;

src/audiomixer/mixerwidget.hpp

@@ -59,7 +59,7 @@ public:
     void reset();
     /** @brief discard stored audio values */
     void clear();
-    static void property_changed( mlt_service , MixerWidget *self, char *name );
+    static void property_changed( mlt_service , MixerWidget *self, mlt_event_data data );
     void setTrackName(const QString &name);
     void setMute(bool mute);
     /** @brief Returns true if track is muted