Disable audio monitor filters on save

src/audiomixer/mixermanager.cpp

@@ -223,3 +223,13 @@ QSize MixerManager::sizeHint() const
 {
     return QSize(m_recommandedWidth, 0);
 }
+
+void MixerManager::pauseMonitoring(bool pause)
+{
+    for (auto item : m_mixers) {
+        item.second->pauseMonitoring(pause);
+    }
+    if (m_masterMixer != nullptr) {
+        m_masterMixer->pauseMonitoring(pause);
+    }
+}

src/audiomixer/mixermanager.hpp

@@ -52,6 +52,8 @@ public:
     /** @brief Connect the mixer widgets to the correspondant filters */
     void connectMixer(bool doConnect);
     void collapseMixers();
+    /** @brief Pause/unpause audio monitoring */
+    void pauseMonitoring(bool pause);
 
 public slots:
     void recordStateChanged(int tid, bool recording);

src/audiomixer/mixerwidget.cpp

@@ -179,6 +179,7 @@ void MixerWidget::buildUI(Mlt::Tractor *service, const QString &trackTag)
         const QString filterService = fl->get("mlt_service");
         if (filterService == QLatin1String("audiolevel")) {
             m_monitorFilter = fl;
+            m_monitorFilter->set("disable", 0);
         } else if (filterService == QLatin1String("volume")) {
             m_levelFilter = fl;
             int volume = m_levelFilter->get_int("level");
@@ -490,3 +491,10 @@ void MixerWidget::connectMixer(bool doConnect)
         m_listener = nullptr;
     }
 }
+
+void MixerWidget::pauseMonitoring(bool pause)
+{
+    if (m_monitorFilter) {
+        m_monitorFilter->set("disable", pause ? 1 : 0);
+    }
+}

src/audiomixer/mixerwidget.hpp

@@ -68,6 +68,8 @@ public:
     void unSolo();
     /** @brief Connect the mixer widgets to the correspondant filters */
     void connectMixer(bool doConnect);
+    /** @brief Disable/enable monitoring by disabling/enabling filter */
+    void pauseMonitoring(bool pause);
 
 protected:
     void mousePressEvent(QMouseEvent *event) override;

src/project/projectmanager.cpp

@@ -666,7 +666,9 @@ QString ProjectManager::projectSceneList(const QString &outputFolder)
     if (hasPreview) {
         pCore->window()->getMainTimeline()->controller()->updatePreviewConnection(false);
     }
+    pCore->mixer()->pauseMonitoring(true);
     QString scene = pCore->monitorManager()->projectMonitor()->sceneList(outputFolder);
+    pCore->mixer()->pauseMonitoring(false);
     if (isMultiTrack) {
         pCore->window()->getMainTimeline()->controller()->slotMultitrackView(true, false);
     }