export: use viewer params not export params

Fixes #1703

app/task/export/export.cpp

@@ -28,10 +28,18 @@ namespace olive {
 ExportTask::ExportTask(ViewerOutput *viewer_node,
                        ColorManager* color_manager,
                        const ExportParams& params) :
-  RenderTask(viewer_node, params.video_params(), params.audio_params()),
   color_manager_(color_manager),
   params_(params)
 {
+  set_viewer(viewer_node);
+
+  // Adjust video params to have no divider
+  VideoParams vp = viewer_node->GetVideoParams();
+  vp.set_divider(1);
+  set_video_params(vp);
+
+  set_audio_params(viewer_node->GetAudioParams());
+
   SetTitle(tr("Exporting \"%1\"").arg(viewer_node->GetLabel()));
   SetNativeProgressSignallingEnabled(false);
 }

app/task/precache/precachetask.cpp

@@ -24,13 +24,17 @@
 
 namespace olive {
 
-PreCacheTask::PreCacheTask(Footage *footage, int index, Sequence* sequence) :
-  RenderTask(new ViewerOutput(), sequence->GetVideoParams(), sequence->GetAudioParams())
+PreCacheTask::PreCacheTask(Footage *footage, int index, Sequence* sequence)
 {
+  // Set video and audio params
+  set_video_params(sequence->GetVideoParams());
+  set_audio_params(sequence->GetAudioParams());
+
   // Create new project
   project_ = new Project();
 
   // Create viewer with same parameters as the sequence
+  set_viewer(new ViewerOutput());
   viewer()->setParent(project_);
   viewer()->SetVideoParams(sequence->GetVideoParams());
   viewer()->SetAudioParams(sequence->GetAudioParams());

app/task/render/render.cpp

@@ -26,10 +26,7 @@
 
 namespace olive {
 
-RenderTask::RenderTask(ViewerOutput *viewer, const VideoParams &vparams, const AudioParams &aparams) :
-  viewer_(viewer),
-  video_params_(vparams),
-  audio_params_(aparams),
+RenderTask::RenderTask() :
   running_tickets_(0),
   native_progress_signalling_(true)
 {

app/task/render/render.h

@@ -36,7 +36,7 @@ class RenderTask : public Task
 {
   Q_OBJECT
 public:
-  RenderTask(ViewerOutput* viewer, const VideoParams &vparams, const AudioParams &aparams);
+  RenderTask();
 
   virtual ~RenderTask() override;
 
@@ -62,16 +62,31 @@ protected:
     return viewer_;
   }
 
+  void set_viewer(ViewerOutput *v)
+  {
+    viewer_ = v;
+  }
+
   const VideoParams& video_params() const
   {
     return video_params_;
   }
 
+  void set_video_params(const VideoParams& video_params)
+  {
+    video_params_ = video_params;
+  }
+
   const AudioParams& audio_params() const
   {
     return audio_params_;
   }
 
+  void set_audio_params(const AudioParams& audio_params)
+  {
+    audio_params_ = audio_params;
+  }
+
   virtual void CancelEvent() override
   {
     finished_watcher_mutex_.lock();