diff --git a/danmaku_workflow.py b/danmaku_workflow.py
index bea7212..1a398ba 100644
--- a/danmaku_workflow.py
+++ b/danmaku_workflow.py
@@ -321,7 +321,7 @@ class WorkerThread(QThread):
                                                        subtitles,
                                                        os.path.join(VIDEO_OUTPUT_DIR, "{}.mp4".format(current_dt)),
                                                        current_sec,
-                                                       current_sec + VIDEO_CLIP_EACH_SEC + VIDEO_CLIP_OVERFLOW_SEC)
+                                                       VIDEO_CLIP_EACH_SEC + VIDEO_CLIP_OVERFLOW_SEC)
             self.handle_handbrake_output(process.stdout)
             process.wait()
             current_sec += VIDEO_CLIP_EACH_SEC