Fix

app.py

@@ -217,9 +217,9 @@ def extract_faces(video_file):
 
     enhanced_audio_path = run_avse_inference(output_path, audio_path)
 
-    from moviepy.video.fx import flip_vertical
+    import moviepy.video.fx.MirrorY  # should import fine
     flipped_output_path = os.path.join(tmpdir, "face_only_video_flipped.mp4")
-    flipped_clip = flip_vertical(clip)
+    flipped_clip = clip.fx(vfx.mirror_y)
     flipped_clip.write_videofile(flipped_output_path, codec="libx264", audio=False, fps=25)
 
     return flipped_output_path, enhanced_audio_path