diff --git a/src/main.py b/src/main.py
index 8391bd9..20c326b 100644
--- a/src/main.py
+++ b/src/main.py
@@ -13,6 +13,7 @@ def main():
     )
     parser.add_argument(
         "input_file",
+        nargs='?',
         help="Path to the input video file.",
         type=str
     )
@@ -25,7 +26,13 @@ def main():
 
     args = parser.parse_args()
 
-    input_file_path = os.path.abspath(args.input_file)
+    input_file_path = args.input_file
+    while not input_file_path:
+        input_file_path = input("Please enter the path to the input video file: ").strip()
+        if not input_file_path:
+            print("Input file path cannot be empty. Please try again.", file=sys.stderr)
+
+    input_file_path = os.path.abspath(input_file_path)
     
     if not os.path.exists(input_file_path):
         print(f"Error: Input file not found at '{input_file_path}'", file=sys.stderr)