diff --git a/pylonrecorder.cpp b/pylonrecorder.cpp
index a03dea8..1d2bfaf 100644
--- a/pylonrecorder.cpp
+++ b/pylonrecorder.cpp
@@ -34,8 +34,7 @@
 PylonRecorder::PylonRecorder(QWidget *parent)
   : QMainWindow(parent), imageLabel(new QLabel), scrollArea(new QScrollArea),
     singlecamgrabber(nullptr), dualcamgrabber(nullptr), 
-    writer0(nullptr), writer1(nullptr),
-    buffer0(nullptr), buffer1(nullptr), 
+    writer(nullptr), buffer(nullptr), 
     singlecam(nullptr), dualcam(nullptr),
     dryRun(false), cameraOpened(false), camsconfigured(false)
 {
@@ -119,9 +118,9 @@ PylonRecorder::~PylonRecorder(){
       singlecamgrabber->requestStop();
       singlecamgrabber->wait(1000);
   }
-  if (writer0 != nullptr && writer0->isRunning()) {
-      writer0->forceStop();
-      writer0->wait(1000);
+  if (writer != nullptr && writer->isRunning()) {
+      writer->forceStop();
+      writer->wait(1000);
   }
   storeSettings();
   if (singlecam != nullptr) {
@@ -135,16 +134,12 @@ PylonRecorder::~PylonRecorder(){
     dualcam = nullptr;
   }
 
-  if (buffer0 != nullptr) {
+  if (buffer != nullptr) {
     qDebug() << "Deleting buffer";
-    delete buffer0;
-    buffer0 = nullptr;
-  }
-  if (buffer1 != nullptr) {
-    qDebug() << "Deleting buffer";
-    delete buffer1;
-    buffer1 = nullptr;
+    delete buffer;
+    buffer = nullptr;
   }
+
   if (singlecamgrabber != nullptr) {
     qDebug() << "Deleting grabber";
     delete singlecamgrabber;
@@ -155,15 +150,10 @@ PylonRecorder::~PylonRecorder(){
     delete dualcamgrabber;
     dualcamgrabber = nullptr;
   }
-  if (writer0 != nullptr) {
-    qDebug() << "Deleting writer";
-    delete writer0;
-    writer0 = nullptr;
-  }
-  if (writer1 != nullptr) {
+  if (writer != nullptr) {
     qDebug() << "Deleting writer";
-    delete writer1;
-    writer1 = nullptr;
+    delete writer;
+    writer = nullptr;
   }
   qDebug() << "Deleting setting";
   delete settings;
@@ -206,11 +196,8 @@ bool PylonRecorder::loadFile(const QString &fileName) {
                                .arg(QDir::toNativeSeparators(fileName), reader.errorString()));
       return false;
     }
-
   setImage(newImage);
-
   setWindowFilePath(fileName);
-
   const QString message = tr("Opened \"%1\", %2x%3, Depth: %4")
       .arg(QDir::toNativeSeparators(fileName)).arg(image.width()).arg(image.height()).arg(image.depth());
   statusBar()->showMessage(message);
@@ -700,20 +687,22 @@ void PylonRecorder::disconnectCamera() {
 
 VideoSpecs PylonRecorder::getVideoSpecs(const ImageSettings &settings) {
   VideoSpecs s = VideoSpecs();
-  if (this->layout.mode == CameraMode::single && this->layout.devices.size() > 0) {
-    s.fps = framerateSpinner->value();
-    s.exposureTime = static_cast<double>(exposureSpinner->value());
-    s.detectorGain = static_cast<double>(gainSpinner->value());
+  if (!this->layout.devices.size() > 0) {
+    return s;
+  }
+  s.fps = framerateSpinner->value();
+  s.exposureTime = static_cast<double>(exposureSpinner->value());
+  s.detectorGain = static_cast<double>(gainSpinner->value());
+  s.pixelType = settings.pixelType;
+  s.orientation = settings.orientation;
+  s.quality = 95;
+
+  if (layout.mode == CameraMode::single) {
     s.width = static_cast<uint32_t>(this->layout.rois[0].width);
     s.height = static_cast<uint32_t>(this->layout.rois[0].height);
-    s.xoffset = static_cast<uint32_t>(this->layout.rois[0].x);
-    s.yoffset = static_cast<uint32_t>(this->layout.rois[0].y);
-
-    s.pixelType = settings.pixelType;
-    s.orientation = settings.orientation;
-    s.quality = 95;
-  } else {
-    qWarning() << "Dual camera mode not supported yet!";
+  } else if (layout.mode == CameraMode::dual) {
+    s.width = static_cast<uint32_t>(this->layout.rois[0].width * 2);
+    s.height = static_cast<uint32_t>(this->layout.rois[0].height);
   }
   return s;
 }
@@ -721,7 +710,7 @@ VideoSpecs PylonRecorder::getVideoSpecs(const ImageSettings &settings) {
 
 void PylonRecorder::startSinglecamRecording() {
   qDebug() << "start single-camera recording!";
-  std::string filename = createFilename(".mp4");
+  std::string filename = createFilename("", ".mp4");
   fileLabel->setText(QString::fromStdString(filename));
   qDebug() << "storing to file " << filename.c_str();
 
@@ -733,15 +722,15 @@ void PylonRecorder::startSinglecamRecording() {
   specs.format = VideoFormat::mp4;
   qDebug() << "got video specifications";
 
-  if (buffer0 != nullptr) {
-    buffer0->clear();
-    delete buffer0;
-    buffer0 = nullptr;
+  if (buffer != nullptr) {
+    buffer->clear();
+    delete buffer;
+    buffer = nullptr;
   }
   qDebug() << "setting image buffer to size " << buffersizeSpinner->value();
-  buffer0 = new ImageBuffer(defaultBufferSize);
-  if (buffersizeSpinner->value() != static_cast<int>(buffer0->capacity())) {
-    buffer0->resize(static_cast<size_t>(buffersizeSpinner->value()));
+  buffer = new ImageBuffer(defaultBufferSize);
+  if (buffersizeSpinner->value() != static_cast<int>(buffer->capacity())) {
+    buffer->resize(static_cast<size_t>(buffersizeSpinner->value()));
     loadBar->setRange(0, buffersizeSpinner->value());
   }
 
@@ -750,7 +739,7 @@ void PylonRecorder::startSinglecamRecording() {
     delete singlecamgrabber;
     singlecamgrabber = nullptr;
   }
-  singlecamgrabber = new Grabber(singlecam, buffer0, defaultFrameRate);
+  singlecamgrabber = new Grabber(singlecam, buffer, defaultFrameRate);
   
   if (framerateSpinner->value() != singlecamgrabber->currentFramerate())
     singlecamgrabber->setFrameRate(framerateSpinner->value());
@@ -760,22 +749,21 @@ void PylonRecorder::startSinglecamRecording() {
       singlecamgrabber->setGain(static_cast<double>(gainSpinner->value()));
 
   qDebug() << "setup writer";
-  if (writer0 != nullptr) {
-    delete writer0;
-    writer0 = nullptr;
+  if (writer != nullptr) {
+    delete writer;
+    writer = nullptr;
   }
-  writer0 = new Writer(buffer0, 0);
-  connect(writer0, SLOT(writingDone( int)), this, SLOT(writerDone( int )));
-  writer0->setVideoSpecs(specs);
+  writer = new Writer(buffer, 0);
+  connect(writer, SLOT(writingDone( int)), this, SLOT(writerDone( int )));
+  writer->setVideoSpecs(specs);
 
   QSettings s;
   this->mdata.read(s);
-  writer0->setProjectMetadata(mdata);
+  writer->setProjectMetadata(mdata);
 
-  buffer0->clear();
+  buffer->clear();
   if (!dryRunCheckBox->isChecked()) {
-    writer0->start();
-    iswriting[0] = true;
+    writer->start();
     writing = true;
   }
   dryRun = dryRunCheckBox->isChecked();
@@ -787,51 +775,37 @@ void PylonRecorder::startSinglecamRecording() {
 
 void PylonRecorder::startDualcamRecording() {
   qDebug() << "start dual-camera recording!";
-  std::string filenamea = createFilename("a", ".mp4");
-  std::string filenameb = createFilename("b", ".mp4");
-  fileLabel->setText(QString::fromStdString(filenamea + " & " + filenameb));
-  qDebug() << "storing to files " << filenamea.c_str() << ", " << filenameb.c_str();
+  std::string filename = createFilename("", ".mp4");
+  fileLabel->setText(QString::fromStdString(filename));
+  qDebug() << "storing to files " << filename.c_str();
 
-  ImageSettings settings = dualcam->getImageSettings(0);
+  ImageSettings settings = dualcam->getImageSettings(0); //FIXME!
   qDebug() << "got image settings";
 
-  VideoSpecs specsa = getVideoSpecs(settings);
-  specsa.filename = filenamea;
-  specsa.format = VideoFormat::mp4;
-  
-  VideoSpecs specsb = getVideoSpecs(settings);
-  specsb.filename = filenameb;
-  specsb.format = VideoFormat::mp4;
+  VideoSpecs specs = getVideoSpecs(settings);
+  specs.filename = filename;
+  specs.format = VideoFormat::mp4;
   qDebug() << "got video specifications";
 
-  if (buffer0 != nullptr) {
-    buffer0->clear();
-    delete buffer0;
-    buffer0 = nullptr;
-  }
-  if (buffer1 != nullptr) {
-    buffer1->clear();
-    delete buffer1;
-    buffer1 = nullptr;
+  if (buffer != nullptr) {
+    buffer->clear();
+    delete buffer;
+    buffer = nullptr;
   }
 
   qDebug() << "setting image buffer to size " << buffersizeSpinner->value();
-  buffer0 = new ImageBuffer(defaultBufferSize);
-  if (buffersizeSpinner->value() != static_cast<int>(buffer0->capacity())) {
-    buffer0->resize(static_cast<size_t>(buffersizeSpinner->value()));
+  buffer = new ImageBuffer(defaultBufferSize);
+  if (buffersizeSpinner->value() != static_cast<int>(buffer->capacity())) {
+    buffer->resize(static_cast<size_t>(buffersizeSpinner->value()));
     loadBar->setRange(0, buffersizeSpinner->value());
   }
-  buffer1 = new ImageBuffer(defaultBufferSize);
-  if (buffersizeSpinner->value() != static_cast<int>(buffer1->capacity())) {
-    buffer1->resize(static_cast<size_t>(buffersizeSpinner->value()));
-  }
 
   qDebug() << "setting up grabber";
   if (dualcamgrabber != nullptr) {
     delete dualcamgrabber;
     dualcamgrabber = nullptr;
   }
-  dualcamgrabber = new DualcamGrabber(dualcam, buffer0, buffer1, defaultFrameRate);
+  dualcamgrabber = new DualcamGrabber(dualcam, buffer, defaultFrameRate);
   if (framerateSpinner->value() != dualcamgrabber->currentFramerate())
     dualcamgrabber->setFrameRate(framerateSpinner->value());
   if (exposureSpinner->value() != int(dualcamgrabber->currentExposureTime()))
@@ -840,42 +814,26 @@ void PylonRecorder::startDualcamRecording() {
       dualcamgrabber->setGain(static_cast<double>(gainSpinner->value()));
 
   qDebug() << "setting up writers";
-  if (writer0 != nullptr) {
-    delete writer0;
-    writer0 = nullptr;
-  }
-  writer0 = new Writer(buffer0, 0);
-  connect(writer0, SIGNAL(writingDone(int)), this, SLOT(writerDone( int )));
-  writer0->setVideoSpecs(specsa);
-
-  if (writer1 != nullptr) {
-    delete writer1;
-    writer1 = nullptr;
+  if (writer != nullptr) {
+    delete writer;
+    writer = nullptr;
   }
-  writer1 = new Writer(buffer1, 1);
-  connect(writer1, SIGNAL(writingDone(int)), this, SLOT(writerDone( int )));
-  writer1->setVideoSpecs(specsb);
+  writer = new Writer(buffer, 0);
+  connect(writer, SIGNAL(writingDone(int)), this, SLOT(writerDone( int )));
+  writer->setVideoSpecs(specs);
 
   qDebug() << "push metadata to writer";
   QSettings s;
   this->mdata.read(s);
-  writer0->setProjectMetadata(mdata);
-
-  buffer0->clear();
-  if (!dryRunCheckBox->isChecked()) {
-    writer0->start();
-    writing = true;
-    iswriting[0] = true;
-  }
+  writer->setProjectMetadata(mdata);
 
-  buffer1->clear();
-  if (!dryRunCheckBox->isChecked()) {
-    writer1->start();
+  dryRun = dryRunCheckBox->isChecked();
+  buffer->clear();
+  if (!dryRun) {
+    writer->start();
     writing = true;
-    iswriting[1] = true;
   }
 
-  dryRun = dryRunCheckBox->isChecked();
   dualcamgrabber->start();
   grabbing = true;
   stopRequest = false;
@@ -906,37 +864,26 @@ void PylonRecorder::stopRecording() {
       qDebug() << "StopRecording: stop grabber!";
       if (singlecamgrabber !=nullptr)
         singlecamgrabber->requestStop();
-      qDebug() << "StopRecording: stop writer!";
-      if (writer0 != nullptr)
-        writer0->requestStop();
-      if (writer1 != nullptr)
-        writer1->requestStop();
+      if (dualcamgrabber !=nullptr)
+        dualcamgrabber->requestStop();
 
+      qDebug() << "StopRecording: stop writer!";
+      if (writer != nullptr)
+        writer->requestStop();
       grabbing = false;
       stopRequest = true;
       grab_stop_action->setEnabled(false);
       qDebug() << "StopRecording: clear buffer!";
-      if(buffer0 != nullptr) {
-          buffer0->clear();
+      if(buffer != nullptr) {
+          buffer->clear();
           // writerDone( 0 ); // Needed? or even dangerous?
       }
-      qDebug() << "StopRecording: clear buffer!";
-      if(buffer1 != nullptr) {
-          buffer1->clear();
-          // writerDone( 1 );
-      }
   }
   qDebug() << "StopRecording done!";
 }
 
 
 void PylonRecorder::writerDone(int cam) {
-  std::cerr << "writer " << cam << "is Done!!!" << std::endl;
-  iswriting[cam] = false;
-  if (iswriting[0] + iswriting[1] > 0) {
-    qDebug() << "waiting for the other writer to finish";
-    return;
-  }
   pressureTimer->stop();
   pressureBar->reset();
   loadBar->reset();
@@ -948,13 +895,9 @@ void PylonRecorder::writerDone(int cam) {
   } else {
     dualcamgrabber->wait(10000);
   }
-  if (writer0 != nullptr)
-    writer0->wait(10000);
-  if (writer1 != nullptr)
-    writer1->wait(10000);
+  if (writer != nullptr)
+    writer->wait(10000);
   writing = false;
-  iswriting[0] = false;
-  iswriting[1] = false;
   updateActions();
   qInfo() << "writer is Done!";
 }
@@ -970,9 +913,8 @@ void PylonRecorder::displayActivity() {
 void PylonRecorder::displaySingleFrame() {
   MyImage *img;
   size_t fc = 0;
-  img = buffer0->readLast(fc);
+  img = buffer->readLast(fc);
   if (img != nullptr){
-    std::cerr << "display, last frame count " << fc << std::endl;
     QImage qimg(static_cast<uchar *>(img->data()), img->width(), img->height(), QImage::Format::Format_Grayscale8);
     setImage(qimg);
   }else {
@@ -1008,13 +950,13 @@ std::string PylonRecorder::createFilename(const std::string &suffix, const std::
 
 
 void PylonRecorder::displayBufferPressure() {
-  int value = static_cast<int>(round(buffer0->bufferPressure()));
+  int value = static_cast<int>(round(buffer->bufferPressure()));
   pressureBar->setValue(value);
   QColor color = progressColor(value);
   progressPalette.setBrush(QPalette::Highlight, QBrush(color));
   pressureBar->setPalette(progressPalette);
 
-  int load = static_cast<int>(buffer0->bufferLoad());
+  int load = static_cast<int>(buffer->bufferLoad());
   loadBar->setValue(load);
 }
 
diff --git a/pylonrecorder.h b/pylonrecorder.h
index 79afb42..fa2022c 100644
--- a/pylonrecorder.h
+++ b/pylonrecorder.h
@@ -13,6 +13,7 @@
 #include "grabber.h"
 #include "dualcamgrabber.h"
 #include "writer.h"
+#include "opencvwriter.h"
 #include "projectsettings.h"
 #include "camconfig.h"
 #include "util.h"
@@ -105,13 +106,12 @@ private:
     double scaleFactor = 1;
     PylonWrapper *singlecam;
     DualcamWrapper *dualcam;
-    ImageBuffer *buffer0, *buffer1;
+    ImageBuffer *buffer;
     Grabber *singlecamgrabber;
     DualcamGrabber *dualcamgrabber;
-    Writer *writer0, *writer1;
+    Writer *writer;
     CameraLayout layout;
     bool grabbing, stopRequest, writing, labelSwitch, dryRun, cameraOpened, camsconfigured;
-    bool iswriting[2] = {0, 0};
     QPalette progressPalette;
     QString activeLabelStyleHigh = "QLabel { font-size: 10pt;font-family: Arial; color : red; }";
     QString activeLabelStyleLow = "QLabel { font-size: 10pt;font-family: Arial; color : cmyk(0, 255, 255, 0, 50); }";