GitHub - agliottone/youtube-dl-mp3-php: Php Script to download youtube video with youtube-dl, FFmpeg and lame. Create a mp3 file to download directly
How do YouTube-to-MP3 sites work? How would one go about building such a site? What libraries/technologies are used? - Quora
GitHub - Alexander-kim/PHP-Youtube-to-MP3-Converter: Download youtube videos as mp3 with using youtube-mp3.org
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