DSD to FLAC conversion using SoX DSD. Tries best gain (+6, +5, +4, etc.) which doesn't clip. You can get SoX DSD binaries from https://audiodigitale.eu/repo/sox/

dsd2flac.py

#!/usr/bin/env python3

import pathlib
import subprocess
import sys
import shutil

root = pathlib.Path(__file__).parent.resolve()
target_root = root / 'dsd'


def convert_folder(folder, gain):
    print(f'  gain: {gain}')

    files = folder.glob('*.dsf')
    for file in files:
        relative_dir = file.parent.relative_to(root)
        target_dir = target_root / relative_dir
        target_dir.mkdir(exist_ok=True, parents=True)

        tmp_path = target_dir / 'tmp.flac'
        tmp_path.unlink(missing_ok=True)

        target_path = target_dir / (file.stem + '.flac')
        if target_path.is_file():
            continue

        print(f'  {target_path}')

        cmd = [
            'soxdsd',
            '-V3',
            file,
            '--bits',
            '24',
            tmp_path,
            #
            'rate',
            '-ub74',
            '88200',
            #
            'gain',
            str(gain),
            #
            'sinc',
            '-25k',
        ]

        p = subprocess.run(cmd, text=True, capture_output=True)
        if 'decrease volume' in p.stderr:
            return dict(success=False, target_dir=target_dir)

        tmp_path.rename(target_path)

    return dict(success=True, target_dir=target_dir)


def main():
    dsd_folders = set()

    dsd_files = root.glob('**/*.dsf')
    for file in dsd_files:
        folder = file.parent
        dsd_folders.add(folder)

    for folder in sorted(dsd_folders):
        print(f'\n\nProcessing {folder}')

        for gain in range(6, -7, -1):
            r = convert_folder(folder, gain)
            if r['success']:
                break

            shutil.rmtree(r['target_dir'])


main()