Make audio work on macos

app.py

@@ -101,7 +101,7 @@ def add_static_image_to_audio(image, audio_input) -> str:
     )  # The duration here is the cut duration from above
     video_clip.fps = 1
     path = Path(vid_output_dir / "output.mp4").as_posix()
-    video_clip.write_videofile(path)
+    video_clip.write_videofile(path, audio_codec="aac")
     return path