Add limitations

app.py

@@ -197,7 +197,7 @@ def extract_faces(video_file):
         fps=fps
     )
     from moviepy.video.fx.MirrorY import MirrorY
-    clip = clip.fx(MirrorY().copy())
+    clip = clip.with_effects([MirrorY().copy()])
 
     # Save audio from original, resampled to 16kHz
     audio_path = os.path.join(tmpdir, "audio_16k.wav")