How do all of these "Save video from YouTube" services work?

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Music by Eric Matyas
https://www.soundimage.org
Track title: The Builders

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Chapters
00:00 Question
00:31 Accepted answer (Score 55)
03:39 Answer 2 (Score 39)
06:32 Thank you

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Full question
https://superuser.com/questions/773719/h...

Accepted answer links:
[youtube-dl]: https://github.com/ytdl-org/youtube-dl
[YouTube extractor]: https://github.com/ytdl-org/youtube-dl/b...
[for simpler sites]: https://github.com/rg3/youtube-dl/blob/m...
[MediaSource APIs]: https://developer.mozilla.org/en-US/docs...

Answer 2 links:
https://pkg.go.dev/github.com/89z/mech/y...

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Tags
#youtube

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