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I'm looking for a library that I can use for my Windows 10 UWP app. I just want to convert Youtube videos to mp3 and save in my PC. Everything in the best possible quality. I know videoLibrary but it is more for downloading videos. Thank you

  • Avidemux and Virtualdub has command line options. – onurcano Jan 1 at 10:01
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Because YouTube video and audio are in separate streams, the easiest way to download a YouTube file is to stream it and use ffmpeg to write the stream to disk. VLC can serve as a GUI for ffmpeg to do that. Commercial software downloads the two streams separately and merges them using ffmpeg.

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