fix ffmpeg

app.py

@@ -51,7 +51,7 @@ def spleeter(separator, aud, model_dropdown, model_file, index_file, pitch):
   )[0]
 
   # combine accompaniment and vocal
-  command = f"""ffmpeg -i "{result}" -i "{accompaniment_filename}" -filter_complex amix=inputs=2:duration=longest "{song_filename}" """
+  command = f"""ffmpeg -y -i "{result}" -i "{accompaniment_filename}" -filter_complex amix=inputs=2:duration=longest "{song_filename}" """
   subprocess.call(command, shell=True)
 
   return song_filename