updated exporter to work with new frame flow

app/codec/encoder.cpp

@@ -96,7 +96,7 @@ void Encoder::Open()
   }
 }
 
-void Encoder::Write(FramePtr frame)
+void Encoder::WriteFrame(FramePtr frame)
 {
   if (open_) {
     WriteInternal(frame);

app/codec/encoder.h

@@ -61,7 +61,7 @@ public:
 
 public slots:
   void Open();
-  void Write(FramePtr frame);
+  void WriteFrame(FramePtr frame);
   virtual void WriteAudio(const AudioRenderingParams& pcm_info, const QString& pcm_filename) = 0;
   void Close();
 
@@ -71,6 +71,8 @@ signals:
 
   void Closed();
 
+  void AudioComplete();
+
 protected:
   virtual bool OpenInternal() = 0;
   virtual void WriteInternal(FramePtr frame) = 0;

app/codec/ffmpeg/ffmpegencoder.cpp

@@ -89,6 +89,8 @@ void FFmpegEncoder::WriteAudio(const AudioRenderingParams &pcm_info, const QStri
 
     pcm.close();
   }
+
+  emit AudioComplete();
 }
 
 bool FFmpegEncoder::OpenInternal()