diff --git a/phi/tools/moviepy_video_tools.py b/phi/tools/moviepy_video_tools.py
index 82c3bceff..1c420036c 100644
--- a/phi/tools/moviepy_video_tools.py
+++ b/phi/tools/moviepy_video_tools.py
@@ -247,6 +247,10 @@ def embed_captions(
     ) -> str:
         """Embed scrolling captions with word-level highlighting into video"""
         try:
+            # If no output path provided, create one based on input video
+            if output_path is None:
+                output_path = video_path.rsplit(".", 1)[0] + "_captioned.mp4"
+
             # Load video
             video = VideoFileClip(video_path)