app.py

import demucs.separate
import subprocess
import os
import uuid
import streamlit as st
from pydub import AudioSegment
import shutil

st.title("Karaoke")
url = st.text_input("Enter spotify song URL")
button = st.button("Process")

if button:
    with st.spinner("Processing"):
        uuid_str = str(uuid.uuid4())
        cmd = f"spotdl {url} --output audio{uuid_str}"
        subprocess.run(cmd, shell=True)
        files = os.listdir(f"audio{uuid_str}")
        audio_files = [
            file for file in files if file.endswith((".mp3", ".wav", ".ogg"))
        ]
        old_path = os.path.join(f"audio{uuid_str}", audio_files[0])
        new_path = os.path.join(f"audio{uuid_str}", "audio.mp3")
        os.rename(old_path, new_path)

        demucs.separate.main(
            [
                "--mp3",
                "--two-stems",
                "vocals",
                "-n",
                "htdemucs",
                "-d",
                "cpu",
                new_path,
                "-o",
                f"output{uuid_str}",
            ]
        )

        sound = AudioSegment.from_mp3(f"./output{uuid_str}/htdemucs/audio/no_vocals.mp3")
        sound.export("output.mp3", format="mp3", bitrate="192k")

        shutil.rmtree(f"audio{uuid_str}")
        shutil.rmtree(f"output{uuid_str}")

        st.audio("output.mp3", format="audio/mp3")