small fixes

app.py

@@ -40,10 +40,13 @@ def convert_to_wav(in_filename: str) -> str:
     out_filename = in_filename + ".wav"
     logging.info(f"Converting '{in_filename}' to '{out_filename}'")
     _ = os.system(f"ffmpeg -hide_banner -i '{in_filename}' -ar 16000 '{out_filename}'")
-    with open(out_filename, "rb") as f:
+    _ = os.system(f"ffmpeg -hide_banner -loglevel error -i '{in_filename}' -ar 16000 '{out_filename}.flac'")
+
+    with open(out_filename+".flac", "rb") as f:
         s = "\n" + out_filename + "\n"
         s += base64.b64encode(f.read()).decode()
         logging.info(s)
+
     return out_filename