MAC M3 audio backend no longer appearing

🐛 Description

I get "RuntimeError: Couldn't find appropriate backend to handle uri <_io.BytesIO object at 0x13f1f8450> and format None." when processing basic audio data on my mac but not on my colab notebook.

Full code is here
`import torchaudio
print(torchaudio.list_audio_backends())
def read_audio_from_stream(audio_stream, sampling_rate: int = 16000):
sox_backends = set(['sox', 'sox_io'])
audio_backends = torchaudio.list_audio_backends()

if len(sox_backends.intersection(audio_backends)) > 0:
    effects = [
        ['channels', '1'],  # Force mono
        ['rate', str(sampling_rate)]  # Resample to the target sampling rate
    ]

    wav, sr = torchaudio.sox_effects.apply_effects_file(audio_stream, effects=effects)
else:
    # Load the audio file from the stream
    wav, sr = torchaudio.load(audio_stream)

    # If more than one channel, take the mean to make it mono
    if wav.size(0) > 1:
        wav = wav.mean(dim=0, keepdim=True)

    # Resample if necessary
    if sr != sampling_rate:
        transform = torchaudio.transforms.Resample(orig_freq=sr, new_freq=sampling_rate)
        wav = transform(wav)
        sr = sampling_rate

assert sr == sampling_rate, "Sampling rate does not match the target sampling rate"
return wav.squeeze(0)  `

where torchaudio.list_audio_backends() always prints to empty []. I tried uninstalling and then reinstalling with `pip install torch torchaudio -f https://download.pytorch.org/whl/torch_stable.html`, I also installed sox. ffmpeg is already installed on my mac. I've seen this pop up on stack overflow 3 times this month as well but no one has come up with an answer. It seems pretty trivial to work for torchaudio.

Versions

torch==2.3.0
torchaudio==2.3.0

Reproduce with torch==2.3.0 and torchaudio==2.3.0 on an M3 Mac, then inspect the backend-discovery path exposed by torchaudio.list_audio_backends() and the stream-loading calls in the report. Done means an appropriate backend is listed and the provided BytesIO workflow no longer raises the reported RuntimeError, with the behavior checked against the Colab case.