taifu 
taifu brings YouTube sound to your iTunes library silently.
Usage
Try
taifu http://www.youtube.com/watch?v=your-video-id
After that type taifu at search box on your iTunes.
Install
gem install taifu
Supported OS
- OSX El Capitan
- OSX Yosemite
- OSX Mavericks
Supported Ruby
- 2.2
- 2.1
- 2.0
Dependencies
- ffmpeg
- youtube-dl
You can install these tools by homebrew.
Warning
You can use this tool for only contents you have copyrights.
Licence
taifu is released under the MIT License.