diff --git a/danmaku_workflow.py b/danmaku_workflow.py
index 694956a..783ab7a 100644
--- a/danmaku_workflow.py
+++ b/danmaku_workflow.py
@@ -341,6 +341,9 @@ class WorkerThread(QThread):
         create_dt = datetime.strptime(_create_dt, "%Y%m%d_%H%M")
         duration = self.get_video_real_duration(file)
         current_sec = 0
+        if duration < VIDEO_CLIP_EACH_SEC:
+            print("[-]Less than each sec, skip")
+            return
         while current_sec < duration:
             if (current_sec + VIDEO_CLIP_OVERFLOW_SEC * 2) > duration:
                 print("[-]Less than 2 overflow sec, skip")
@@ -385,18 +388,6 @@ class WorkerThread(QThread):
         return out_time
 
 
-class NvencWorkerThread(QThread):
-    ...
-
-
-class IntelWorkerThread(QThread):
-    ...
-
-
-class SplitWorkerThread(QThread):
-    ...
-
-
 def duration_str_to_float(duration_str) -> float:
     _duration = datetime.strptime(duration_str, "%H:%M:%S.%f") - datetime(1900, 1, 1)
     return _duration.total_seconds()