If you ever had to download a video from YouTube and convert it to a mp3 file you know that there are a lot of shady looking sites offering that exact service.
But there is a more convenient way, especially, if you are a Mac and OSX user.
A guy called rg3 on GitHub created a repository which provides a neat little command line tool to download videos from several portals with several different options. Description from the repo:
youtube-dl is a command-line program to download videos from YouTube.com and a few more sites. It requires the Python interpreter, version 2.6, 2.7, or 3.2+, and it is not platform specific. It should work on your Unix box, on Windows or on Mac OS X. It is released to the public domain, which means you can modify it, redistribute it or use it however you like.
There are several ways to install the tool. You can choose from curl, wget, pip, mac ports or brew. I chose brew:
brew install youtube-dl
In addition it is necessary to install ffmpeg, an audio converter,which will automatically convert the downloaded videos to mp3. This is also possible via brew:
brew install ffmpeg
Now you are good to go.
There are countless options available for the downloader. Check the GitHub README for a full list.
Now simply access to your desired destination folder via terminal and enter the following command:
youtube-dl -x –audio-format mp3 https://www.youtube.com/watch\?v\=abc1DEF2ghi3JKL4
This will first download the video and then convert the file to mp3.