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The actual youtube metadata extraction is performed by the awesome ytdl-core library https://www.npmjs.com/package/ytdl-core https://github.com/fent/node-ytdl-core

For local work, https://www.npmjs.com/package/ytdl is a CLI powered by the same module. There is also a python-based youtube-dl command https://rg3.github.io/youtube-dl/ that supports a ton of sites

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Downloading YouTube files is ridiculously simple.

http://m.youtube.com/watch?v=XxXxXx&layout=mobile&ajax=1

There you have all stream files in a nice json format, which means opus and m4a for audio files.

I have a python project which is very quick to gather metadata, because I wanted to have a responsive YouTube app without using the browser. Had no time for it recently, though.

Thanks this is actually really useful. Never knew about it

or you could just generate direct link (@) in the browser and download m4a without any external programs.

@ "Download YouTube Videos as MP4" did that, but author removed that script from the internet (got google nastygram maybe?). Iv got a copy at https://github.com/raszpl/smplayer4YT

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