Youtube audio to mp3

Had a patron who wanted to capture Youtube audio to MP3 file:


GenYouTube converts YouTube videos to MP3 and other formats for audio and video. Copy and paste the link to a YouTube video in the search field. GenYouTube starts playing the video. You then select the format for the audio file, such as MP3 or M4A. Download the file to play it on your device.
GenYouTube has other tricks up its sleeve. If you're watching a video on YouTube, simply add the word gen to the video link, as in https://www.genyoutube.com/watch?v=qZXdZwsx64I, and you're swept away to the GenYouTube site to download the video. You can also tap into the service by installing browser extensions for Firefox, Chrome, and Safari.

From PCmag.com

4K Video Downloader

Save audio from YouTube videos in MP3, M4A or OGG format

Operating system: Windows

4kdownload.com/

No ads or bundled software

Can download playlists

Only available for Windows

Long playlists require license

It might not be the most stylish software around, but like 4K YouTube to MP3 above, 4K Video Downloader is brilliant.
It works in a similar way, too, but because this app is chiefly for downloading whole videos, there are a couple of extra steps involved. Copy the URL of a video from your web browser (it supports YouTube, Vimeo, Facebook, Flickr and DailyMotion) and click 'Paste URL'. Select 'Extract audio' and pick MP3, OGG or M4A, then click 'Extract' and the audio will be converted and saved to the destination of your choice. Done.
The free version of 4K Video Downloader lets you download up to 24 videos in a playlists, which is particularly useful for grabbing several songs by a particular artist. You can download and convert longer playlists to MP3 format if you buy a license key, but the software's free features are very impressive.
Read our full review: 4K Video Downloader

From techradar.com

Youtube playlist in VLC

Want to have Youtube playlist with out commercials, use VLC and a plugin.

For playlists, you'll need the VLC  and the add-on YouTube Video and Playlist Importer installed. Once it's installed, simply copy the playlist URL from your browser, then hit CTRL+N in VLC, select the Network box, and paste the playlist URL. The playlist automatically gets imported into VLC where you can use any keyboard shortcuts you have set up to watch playlists ad-free.  (from Life hacker)

 To install the YouTube Video and Playlist Importer  download it, and copy the file to this directory:

* Windows (all users): %ProgramFiles%\VideoLAN\VLC\lua\extensions\
* Windows (current user): %APPDATA%\VLC\lua\extensions\
* Linux (all users): /usr/share/vlc/lua/extensions/
* Linux (current user): ~/.local/share/vlc/lua/extensions/
* Mac OS X (all users): /Applications/VLC.app/Contents/MacOS/share/lua/extensions/
(create directories if they don't exist)
Restart  VLC.

Start parameter for YouTube videos

To start Youtube video in the middle:

#t=3m1s


example:
http://www.youtube.com/watch?v=44wDwMQVqCc#t=3m1s


Found this here