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Source: https://forum.audacityteam.org/viewtopic.php?f=20&t=104991&sid=0d7eadb4db3640283f6a33ac22307825&start=20
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First of you need to install the following as a plugin in audacity:
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```
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;nyquist plug-in
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;version 4
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;type tool
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;codetype lisp
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;name "Labels to Chapters"
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;author "Steve Daulton"
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;release 2.3.2
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;copyright "Released under terms of the GNU General Public License version 2"
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;control timebase "Time base" int "" 1000 100 2000
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;control title "Title" string "" ""
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;control encodedby "Encoded by" string "" ""
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;control artist "Artist" string "" ""
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;control date "Date" string "" "2020"
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;control filename "Save file as" file "" "*default*/metadata.txt" "Text file|*.txt;*.TXT|All files|*.*;*" "save,overwrite"
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(setf metadata
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(format nil ";FFMETADATA1~%~
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title=~a~%~
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encoded_by=~a~%~
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artist=~a~%~
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date=~a~%~
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encoder=Lavf58.27.103~%"
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title
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encodedby
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artist
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date))
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;; Get label data from first label track
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(setf labels (second (first (aud-get-info "Labels"))))
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(dolist (label labels)
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(setf chapter
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(format nil "[CHAPTER]~%~
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TIMEBASE=1/~a~%~
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START=~a~%~
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END=~a~%~
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title=~a~%"
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timebase
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(round (* timebase (first label)))
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(round (* timebase (second label)))
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(third label)))
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(string-append metadata chapter))
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(setf fp (open filename :direction :output))
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(format fp metadata)
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(close fp)
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(format nil "File written to~%~a" filename)
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```
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This is the code that converts your label track into an ffmpeg-metadata file.
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1. Save the code as a `.ny` whereever you want to keep it or where you usually save your audacity plugins.
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2. Open Audacity
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3. Go to "Tools" -> "Nyquist Plug-in Installer..."
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4. Choose the file you saved in step one and confirm
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5. Under "Tools" -> "Add / Remove Plug-ins..." make sure the new plugin was successfully added and is enabled
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6. Create your audio file with the first label track serving as chapter marks
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7. When you are done, go to "Tools" and run the newly installed plug-in, saving the `metadata.txt` somewhere
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8. Export the audio as an mp3 file
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9. Open a terminal
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10. Run `ffmpeg -i audio.mp3 -i metadata.txt -map_metadata 1 -codec copy -id3v2_version 3 -write_id3v1 1 audio-with-chapters.mp3`
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Don't simply copy the command, the file paths will differ ;)
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While this solution isn't the most straightforward, you can at least edit your chapter marks in a GUI.
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