diff --git a/handle_imported_video.py b/handle_imported_video.py
index 115ae64..bd0d5e3 100644
--- a/handle_imported_video.py
+++ b/handle_imported_video.py
@@ -153,20 +153,20 @@ if _ACTION == "join":
             if _FLIP:
                 if ops == "win":
                     myCmd =  [
-                "ffmpeg", "-display_rotation", "180", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name, "null", "/dev/null",
+                "ffmpeg", "-display_rotation", "180", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name, "-f", "null", "/dev/null",
             ]
                 else:
                     myCmd =  [
-                "/opt/ffmpeg/ffmpeg", "-display_rotation", "180", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name, "null", "/dev/null",
+                "/opt/ffmpeg/ffmpeg", "-display_rotation", "180", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name, "-f", "null", "/dev/null",
             ]
             else:
                 if ops == "win":
                     myCmd =  [
-                "ffmpeg", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name , "null", "/dev/null",
+                "ffmpeg", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name , "-f", "null", "/dev/null",
             ]
                 else:
                     myCmd =  [
-                "/opt/ffmpeg/ffmpeg", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name , "null", "/dev/null",
+                "/opt/ffmpeg/ffmpeg", "-f", "concat", "-i", "video.txt ","-vcodec", "copy", "-acodec", "copy", export_name , "-f", "null", "/dev/null",
             ]
                             
             print(myCmd)