Unable to load m4a files with librosa.load() in streamlit run

[edsaac]

Instead of

@NSTJunHara

import streamlit as st
import librosa as rosa
import pandas as pd
import numpy as np

uploaded_files = st.file_uploader("audio file", accept_multiple_files=True)

for uploaded_file in uploaded_files:
    st.write("filename:", uploaded_file.name)
    wave, sr = rosa.load(uploaded_file, sr=None)
    times = pd.Index(np.array(range(len(wave))) / sr, name="time(sec)")
    ts = pd.Series(wave, index=times, name=str(uploaded_file))
    st.write(ts)

try with

import streamlit as st
import librosa as rosa
import pandas as pd
import numpy as np
from tempfile import NamedTemporaryFile

st.title("異音チェッカー シミュレーション")

uploaded_files = st.file_uploader(
    "OKデータのオーディオファイルをアップロードしてください", accept_multiple_files=True
)

for uploaded_file in uploaded_files:
    st.write("filename:", uploaded_file.name)
    with NamedTemporaryFile() as f:
        f.write(uploaded_file.read())
        wave, sr = rosa.load(f.name, sr=None)
    
    times = pd.Index(np.array(range(len(wave))) / sr, name="time(sec)")
    ts = pd.Series(wave, index=times, name=str(uploaded_file))
    st.write(ts)

---

Details:
that looks like a problem from the librosa package on how it handles paths and file-like objects. You can replicate the exception you see on streamlit when you try passing a BytesIO object to librosa.load(), which it’s supposedly supported but leads to different behavior.

import librosa as rosa
import pandas as pd
import numpy as np
import pathlib

print("audio check")

cwd = pathlib.Path.cwd()
uploaded_files = sorted(cwd.glob("*.m4a"))

for uploaded_file in uploaded_files:
    with open(uploaded_file, 'rb') as f:
        wave, sr = rosa.load(f, sr=None)
        times = pd.Index(np.array(range(len(wave))) / sr, name="time(sec)")
        ts = pd.Series(wave, index=times, name=str(uploaded_file))
        print(ts)

The proposed fix is to write the BytesIO object obtained from st.file_uploader into a temporal file, so librosa.load() is tricked into treating that as a path.