Whisper UnicodeDecodeError

Hello,
I’m trying to run the example for speach to text, but I encounter this error:

Traceback (most recent call last):
  File "/home/jrocha/projects/voice/test.py", line 10, in <module>
    transcript = openai.Audio.transcribe("whisper-1", audio_file)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/openai/api_resources/audio.py", line 65, in transcribe
    response, _, api_key = requestor.request("post", url, files=files, params=data)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/openai/api_requestor.py", line 220, in request
    result = self.request_raw(
             ^^^^^^^^^^^^^^^^^
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/openai/api_requestor.py", line 520, in request_raw
    result = _thread_context.session.request(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/requests/sessions.py", line 573, in request
    prep = self.prepare_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/requests/sessions.py", line 484, in prepare_request
    p.prepare(
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/requests/models.py", line 371, in prepare
    self.prepare_body(data, files, json)
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/requests/models.py", line 556, in prepare_body
    (body, content_type) = self._encode_files(files, data)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jrocha/projects/voice/venv/lib/python3.11/site-packages/requests/models.py", line 191, in _encode_files
    fdata = fp.read()
            ^^^^^^^^^
  File "<frozen codecs>", line 322, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x9e in position 14: invalid start byte

I have tried .mp3, .m4a and .ogg files but they all give back the same result.
Any help would be appreciated.

with open("untitled.mp3", 'rb') as audio_file:

Forgot the “rb”