2016-12-20 Extract YouTube Audio

This is easy to do if you have youtube-dl. [1]

youtube-dl.exe --extract-audio --audio-format mp3 https://youtu.be/...

On Windows, you need to install both youtube-dl and ffmpeg for Windows:

./youtube-dl.exe --extract-audio --audio-format=mp3 --ffmpeg-location=/Portable\ Programs/ffmpeg-20161218-02aa070-win64-static/bin/ffmpeg.exe https://www.youtube.com/watch?v=u4DZPemB4uI

If you downloaded the mp4 file and forgot the transformation to mp3, you can do that, too:

ffmpeg -i somefile.mp4 -q:a 0 -map a somefile.mp3

This will give you one big file. But if you know the number of tracks, you can get a copy of mp3splt. I got the zipfile, unzipped it, and ran it on my file as follows, given that I knew this file contained 25 tracks:

mp3splt_2.6.2_i386/mp3splt.exe -s -p nt=25,rm foo.mp3

And here’s how you can add the metadata, if you have the track list:

while read title; do
    file="fileprefix_$(printf "%02d" $i).mp3"
    mp3info -a "artist" -c "URL or whatever" -g 24 -l "album" -n $i -t "$title" -y 2013 "$file"
    i=$(($i + 1))
done <<EOF
title for track 1
title for track 2
title for track 3
title for track 4
title for track 25



@fitheach said that this will be re-encoding the audio from one lossy to another, and this is true. Here’s an alternative:

youtube-dl -F https://www.youtube.com/watch?v=QS6b8JKzUeo

This shows the existing formats and their codes (first column). You could download WebM with Opus or Vorbis, for example. Use -f and the code you want to download just that format.

Then use ffmpeg to copy out the audio (example Vorbis):

ffmpeg -i "$file" -vn -acodec copy  "OGG/$nosuffix.ogg"

You need to know the codecs your player supports, of course. Perhaps mp3 is all it can do. I installed Rockbox on my iPod, however, and it supports a lot, apparently!

– Alex Schroeder 2019-04-19 08:39 UTC

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