Rekordbox .flac to .aiff conversion

readme.md

quick script that, given a rekordbox library.xml file, converts all .flac files to .aiff, preserving file metadata like cue points, play count, and album art. also maintains the file's bit rate.

probably will fail in some weird cases that i didn't have to care about with my tiny baby library

rekordbox-flac-to-aiff.py

import xml.etree.ElementTree as ET
import urllib.parse
from pathlib import Path
import os
import subprocess
import json
import argparse


def convert_files(input_xml_path, output_xml_path):
  tree = ET.parse(input_xml_path)
  logfile = open('flac-conversion-log2.txt', 'a')
  tracks = tree.getroot().findall('./COLLECTION/TRACK')

  for track in tracks:
    track_name = f"{track.attrib['Artist']} - {track.attrib['Name']}"
    if track.attrib['Kind'].lower() == 'flac file':
      # Fenagle rekordbox path to something usable
      filename: str = track.attrib['Location'].replace('file://localhost', '')
      filename = urllib.parse.unquote(filename)
      flac_path = Path(filename)
      aiff_path = flac_path.with_suffix('.aiff')

      # Convert flac -> wav
      if not aiff_path.exists():
        if not flac_path.exists():
          raise RuntimeError(f"Path doesn't exist: {flac_path}")

        print("Probing", track_name)
        probed_data = subprocess.run(['ffprobe', '-v', 'quiet', '-print_format', 'json', '-show_streams', flac_path], capture_output=True, text=True).stdout
        parsed_probe = json.loads(probed_data)
        bit_depth = parsed_probe["streams"][0]["bits_per_raw_sample"]
        print(f"Converting with bit depth {bit_depth}:", track_name)
        convert_result = subprocess.run(['ffmpeg', '-i', flac_path, '-write_id3v2', '1', '-c:a', f"pcm_s{bit_depth}be", '-c:v', 'copy', aiff_path], capture_output=True)
        if convert_result.returncode != 0:
          print("Failed", convert_result.returncode, "on", flac_path)
          print("STDOUT:", convert_result.stdout)
          print("STDERR:", convert_result.stderr)
          break
        logfile.write(str(flac_path))
        logfile.write("\n")

      # Defenagle sensible path into rekordbox's thing
      aiff_uri = aiff_path.as_uri().replace('file:///', 'file://localhost/')
      track.attrib['Kind'] = 'AIFF File'
      track.attrib['Location'] = aiff_uri
      track.attrib['Comments'] = f"{track.attrib['Comments']} flac-converted"
      track.attrib['Size'] = str(os.path.getsize(aiff_path))
      print("Done with", track_name)

  tree.write(output_xml_path)


if __name__ == "__main__":
  parser = argparse.ArgumentParser()
  parser.add_argument("-i", "--input", help="library.xml location", required=True)
  parser.add_argument("-o", "--output", help="updated library.xml location", required=True)
  args = parser.parse_args()

  convert_files(args.input, args.output)