diff --git a/include/f1x/openauto/autoapp/Projection/QtVideoOutput.hpp b/include/f1x/openauto/autoapp/Projection/QtVideoOutput.hpp
index 2e182f7..172c3b5 100644
--- a/include/f1x/openauto/autoapp/Projection/QtVideoOutput.hpp
+++ b/include/f1x/openauto/autoapp/Projection/QtVideoOutput.hpp
@@ -57,7 +57,6 @@ private:
     SequentialBuffer videoBuffer_;
     std::unique_ptr<QVideoWidget> videoWidget_;
     std::unique_ptr<QMediaPlayer> mediaPlayer_;
-    std::mutex mutex_;
 };
 
 }
diff --git a/include/f1x/openauto/autoapp/Projection/SequentialBuffer.hpp b/include/f1x/openauto/autoapp/Projection/SequentialBuffer.hpp
index 361f808..153b687 100644
--- a/include/f1x/openauto/autoapp/Projection/SequentialBuffer.hpp
+++ b/include/f1x/openauto/autoapp/Projection/SequentialBuffer.hpp
@@ -44,6 +44,7 @@ public:
     bool reset() override;
     bool canReadLine() const override;
     qint64 bytesAvailable() const override;
+    bool open(OpenMode mode) override;
 
 protected:
     qint64 readData(char *data, qint64 maxlen) override;
diff --git a/src/autoapp/Projection/QtVideoOutput.cpp b/src/autoapp/Projection/QtVideoOutput.cpp
index 0cbffde..ad4636c 100644
--- a/src/autoapp/Projection/QtVideoOutput.cpp
+++ b/src/autoapp/Projection/QtVideoOutput.cpp
@@ -49,8 +49,6 @@ void QtVideoOutput::createVideoOutput()
 
 bool QtVideoOutput::open()
 {
-    std::lock_guard<decltype(mutex_)> lock(mutex_);
-
     return videoBuffer_.open(QIODevice::ReadWrite);
 }
 
@@ -67,15 +65,11 @@ void QtVideoOutput::stop()
 
 void QtVideoOutput::write(uint64_t, const aasdk::common::DataConstBuffer& buffer)
 {
-    std::lock_guard<decltype(mutex_)> lock(mutex_);
-
     videoBuffer_.write(reinterpret_cast<const char*>(buffer.cdata), buffer.size);
 }
 
 void QtVideoOutput::onStartPlayback()
 {
-    std::lock_guard<decltype(mutex_)> lock(mutex_);
-
     videoWidget_->setAspectRatioMode(Qt::IgnoreAspectRatio);
     videoWidget_->setFocus();
     videoWidget_->setWindowFlags(Qt::WindowStaysOnTopHint);
@@ -89,8 +83,6 @@ void QtVideoOutput::onStartPlayback()
 
 void QtVideoOutput::onStopPlayback()
 {
-    std::lock_guard<decltype(mutex_)> lock(mutex_);
-
     videoWidget_->hide();
     mediaPlayer_->stop();
 }
diff --git a/src/autoapp/Projection/SequentialBuffer.cpp b/src/autoapp/Projection/SequentialBuffer.cpp
index e4a2911..bd90a45 100644
--- a/src/autoapp/Projection/SequentialBuffer.cpp
+++ b/src/autoapp/Projection/SequentialBuffer.cpp
@@ -37,6 +37,13 @@ bool SequentialBuffer::isSequential() const
     return true;
 }
 
+bool SequentialBuffer::open(OpenMode mode)
+{
+    std::lock_guard<decltype(mutex_)> lock(mutex_);
+
+    return QIODevice::open(mode);
+}
+
 qint64 SequentialBuffer::readData(char *data, qint64 maxlen)
 {
     std::lock_guard<decltype(mutex_)> lock(mutex_);