diff --git a/src/playback_thread.cpp b/src/playback_thread.cpp
index b56a277..5d25377 100644
--- a/src/playback_thread.cpp
+++ b/src/playback_thread.cpp
@@ -393,12 +393,10 @@ void Playback::run() {
             frame = temp_frame;
         }
 
-        mutex.unlock();
         static std::vector<FilterValue> cur;
-        mutex_shown.lock();
         cur = current;
-        mutex_shown.unlock();
         ac::orig_frame = frame.clone();
+        mutex.unlock();
         mutex.lock();
         if(cycle_on > 0) {
             cv::Mat *cycle_image = 0;
@@ -437,9 +435,11 @@ void Playback::run() {
         mutex.unlock();
 
         if(single_mode == true && alpha > 0) {
+            mutex.lock();
             if(fadefilter == true) filterFade(frame, current_filter, prev_filter, alpha);
             drawEffects(frame);
             alpha -= 0.08;
+            mutex.unlock();
         } else if(single_mode == true) {
             mutex.lock();
             ac::setSubFilter(-1);
diff --git a/src/playback_thread.h b/src/playback_thread.h
index cf22329..9d41295 100644
--- a/src/playback_thread.h
+++ b/src/playback_thread.h
@@ -23,35 +23,35 @@ private:
     QWaitCondition condition;
     cv::Mat frame;
     double frame_rate;
-    bool recording;
+    std::atomic<bool> recording;
     cv::VideoCapture capture;
     cv::VideoWriter  writer;
     cv::Mat rgb_frame;
     QImage img;
     std::vector<FilterValue> current;
-    bool isPaused, isStep;
-    bool record_png;
-    int png_index;
+    std::atomic<bool> isPaused, isStep;
+    std::atomic<bool> record_png;
+    std::atomic<int> png_index;
     std::string png_path;
     VideoMode mode;
-    int device_num;
+    std::atomic<int> device_num;
     std::string file_name_png;
     unsigned long *frame_index;
-    unsigned int red, green, blue;
-    unsigned int bright_, gamma_, saturation_;
-    bool single_mode;
+    std::atomic<unsigned int> red, green, blue;
+    std::atomic<unsigned int> bright_, gamma_, saturation_;
+    std::atomic<bool> single_mode;
     FilterValue current_filter, prev_filter;
     double alpha;
-    bool flip_frame1, flip_frame2;
-    bool repeat_video;
-    bool fadefilter;
+    std::atomic<bool> flip_frame1, flip_frame2;
+    std::atomic<bool> repeat_video;
+    std::atomic<bool> fadefilter;
     std::vector<cv::Mat> cycle_values;
-    int cycle_on;
-    int cycle_index;
-    int frame_num;
-    bool _custom_cycle;
-    int _custom_cycle_index;
-    int fps_delay;
+    std::atomic<int> cycle_on;
+    std::atomic<int> cycle_index;
+    std::atomic<int> frame_num;
+    std::atomic<bool> _custom_cycle;
+    std::atomic<int> _custom_cycle_index;
+    std::atomic<int> fps_delay;
 public:
     Playback(QObject *parent = 0);
     ~Playback();