diff --git a/main.py b/main.py
index 0e43173..4c26d77 100644
--- a/main.py
+++ b/main.py
@@ -59,9 +59,13 @@ if not os.path.isdir(input_dir):
     print("❌ Path not found or not a directory:", input_dir)
     sys.exit(1)
 
-# collect .m4b files robustly
-all_files = [f for f in os.listdir(input_dir)
-             if os.path.isfile(os.path.join(input_dir, f)) and f.lower().endswith(".m4b")]
+# collect .m4b files robustly (skip hidden / ._ files)
+all_files = [
+    f for f in os.listdir(input_dir)
+    if os.path.isfile(os.path.join(input_dir, f))
+    and f.lower().endswith(".m4b")
+    and not f.startswith(".")  # skip hidden macOS resource files
+]
 
 if not all_files:
     print("❌ No .m4b files found in that directory.")