diff --git a/src/main_window.cpp b/src/main_window.cpp
index f1f4488..fae701e 100644
--- a/src/main_window.cpp
+++ b/src/main_window.cpp
@@ -456,12 +456,12 @@ bool AC_MainWindow::startVideo(const QString &filename, const QString &outdir, b
 
 void AC_MainWindow::controls_Stop() {
     playback->Stop();
+    progress_bar->hide();
     controls_showvideo->setEnabled(false);
     controls_stop->setEnabled(false);
     controls_pause->setEnabled(false);
     controls_step->setEnabled(false);
     controls_snapshot->setEnabled(false);
-
     if(capture_video.isOpened()) {
         capture_video.release();
         if(recording == true) writer.release();
@@ -492,7 +492,6 @@ void AC_MainWindow::controls_Stop() {
         disp->hide();
         playback->Release();
     }
-    
 }
 
 void AC_MainWindow::controls_ShowVideo() {
diff --git a/src/playback_thread.cpp b/src/playback_thread.cpp
index 4a8368f..0bbcfad 100644
--- a/src/playback_thread.cpp
+++ b/src/playback_thread.cpp
@@ -12,6 +12,7 @@ void Playback::Play() {
             stop = false;
         }
     }
+    //start(LowPriority);
     start(HighPriority);
 }
 
@@ -58,13 +59,11 @@ void Playback::run() {
             emit stopRecording();
             return;
         }
-        
+        mutex.unlock();
         static std::vector<std::pair<int, int>> cur;
         mutex_shown.lock();
         cur = current;
         mutex_shown.unlock();
-        
-        
         ac::orig_frame = frame.clone();
         if(cur.size()>0) {
             ac::in_custom = true;
@@ -82,6 +81,7 @@ void Playback::run() {
                 }
             }
         }
+        mutex.lock();
         if(recording && writer.isOpened()) {
             writer.write(frame);
         }
@@ -122,9 +122,7 @@ Playback::~Playback() {
 }
 
 void Playback::Stop() {
-    mutex.lock();
     stop = true;
-    mutex.unlock();
 }
 
 void Playback::Release() {
diff --git a/src/playback_thread.h b/src/playback_thread.h
index 94bac60..8cc2a63 100644
--- a/src/playback_thread.h
+++ b/src/playback_thread.h
@@ -3,11 +3,13 @@
 
 #include "qtheaders.h"
 
+#include<atomic>
+
 class Playback : public QThread {
     Q_OBJECT
 private:
-    bool stop;
-    QMutex mutex,mutex_shown,mutex_add;
+    std::atomic<bool> stop;
+    QMutex mutex,mutex_shown,mutex_add, mutex_start;
     QWaitCondition condition;
     cv::Mat frame;
     int frame_rate;