diff --git a/trap/frame_emitter.py b/trap/frame_emitter.py
index 0f732b5..e960f85 100644
--- a/trap/frame_emitter.py
+++ b/trap/frame_emitter.py
@@ -99,7 +99,7 @@ class FrameEmitter:
             logger.info(f"Play from '{str(video_path)}'")
             video = cv2.VideoCapture(str(video_path))
             fps = video.get(cv2.CAP_PROP_FPS)
-            frame_duration = 1./fps
+            target_frame_duration = 1./fps
             logger.info(f"Emit frames at {fps} fps")
 
             prev_time = time.time()
@@ -126,13 +126,13 @@ class FrameEmitter:
                 self.frame_sock.send(pickle.dumps(frame))
 
                 # defer next loop
-                new_frame_time = time.time()
-                time_diff = (new_frame_time - prev_time)
-                if time_diff < frame_duration:
-                    time.sleep(frame_duration - time_diff)
-                    new_frame_time += frame_duration - time_diff
-                else:
-                    prev_time = new_frame_time
+                now = time.time()
+                time_diff = (now - prev_time)
+                if time_diff < target_frame_duration:
+                    time.sleep(target_frame_duration - time_diff)
+                    now += target_frame_duration - time_diff
+                
+                prev_time = now
                 
                 i += 1