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This Linux package enables you to download multimedia videos from youtube.com on your debian-installed computer.
sudo apt install youtube-dl
Mise à jour (dernière version nécessaire) :
sudo youtube-dl -U
To download a video:
youtube-dl http://www.youtube.com/watch?v=DsPYENB88wk
source: http://bredsaal.dk/downloading-youtube-videos-using-debian-ubuntu
To download only the sound in MP3 format:
youtube-dl --extract-audio --audio-format mp3 https://www.youtube.com/watch?v=hy3W-3HPMWg
source: https://askubuntu.com/questions/178481/how-to-download-an-mp3-track-from-a-youtube-video
This works also for other website, e.g. rtbf.be :
youtube-dl --extract-audio --audio-format mp3 https://www.rtbf.be/auvio/detail_le-journal-de-12h?id=2633236