Currently, extracting audiobooks often results in:

This class takes the metadata and applies it to the output file.

import subprocess
import os
class MediaEmbedder:
def init(self, ffmpeg_path="ffmpeg"):
self.ffmpeg_path = ffmpeg_path
def process_file(self, input_file: str, output_file: str, metadata: AudiobookMetadata):
    """
    Uses FFmpeg to create a new M4B file with embedded chapters and metadata.
    """
    cmd = [
        self.ffmpeg_path,
        '-i', input_file,
        '-i', metadata.cover_url,  # Download cover art directly
        '-map', '0:a',             # Map audio from input
        '-map', '1:v',             # Map video (cover) from second input
        '-c copy',                 # Stream copy (no re-encoding for speed)
        '-c:v:1', 'mjpeg',         # Encode cover as MJPEG
        '-disposition:v:1', 'attached_pic', # Set as attached picture
        '-metadata', f'title=metadata.title',
        '-metadata', f'artist=metadata.author',
        '-metadata', f'album=metadata.title', # Treat audiobook as album
        '-metadata', f'composer=metadata.narrator',
        '-metadata', f'comment=metadata.synopsis[:255]', # ID3 limit
        '-y', output_file
    ]
# Handle Chapter Metadata (FFmetadata file approach)
    metadata_file = "ffmeta_temp.txt"
    self._write_ffmetadata(metadata_file, metadata.chapters)
    cmd.insert(4, '-map_metadata')
    cmd.insert(5, metadata_file)
print(f"Processing: metadata.title...")
    # subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    # Cleanup metadata file
    # os.remove(metadata_file)
def _write_ffmetadata(self, filepath, chapters: List[ChapterInfo]):
    with open(filepath, 'w') as f:
        f.write("; FFmetadata file generated by ScarletBooks\n")
        f.write("[CHAPTER]\n")
        for chap in chapters:
            f.write(f"TIMEBASE=1/1000\n")
            f.write(f"START=int(chap.start_time * 1000)\n")
            f.write(f"END=int(chap.end_time * 1000)\n")
            f.write(f"title=chap.title\n")

There is no safe, legitimate “scarletbooksacdextractor full.” If you found a site offering it, assume it’s either: