ffmpeg -i audio.aac -c copy -vn -ac 1 -ar 22050 -b:a 32k output.m4b Note: Lower bitrate (32k) saves space for speech-only content. Create a chapters.txt file:
If you need help with the commands or Audacity steps, let me know and I’ll break it down further. ffmpeg -i audio
CHAPTER1=00:00:00.000 CHAPTER1NAME=Opening trials CHAPTER2=00:12:30.000 CHAPTER2NAME=Camp drama Then remux: ffmpeg -i audio