I am after a desktop software to download YouTube files into audio, preferably, MP3 to listen on the move. I would like the software to be free from ads. I prefer Windows 8.1 but I have Linux box that in case I can use.
If you use VLC there is an easy way for such conversion.
To convert Youtube video to mp3 these are required steps:
Start up VLC Media tab chose Open Network Stream & in new pop up screen add URL address of youtube video you want to convert. From Play drop down menu chose convert (keyboard shortcut is Alt+C
In new screen make sure to fill in needed information.
Choose the destination file by clicking on Browse.
In the Settings section, you can choose the format that you want to convert to. VLC support conversion to MP3, Flac & Vorbis audio formats.
When everything set click Start to convert file. When seeking on main VLC screen is complete, the conversion is completed.
Note that mentioned method will work with radio streams too, or any web page where specific file URL can be grabbed.
I use youtude-dl for downloading videos from YouTube. It's a console program (without any ads), written in Python. I've used it on Windows and Linux (it worked well) and according to the official site it should work on Mac OS X too.
It also supports extracting audio. You can set the format too, for example:
youtube-dl --extract-audio --audio-format mp3 "https://www.youtube.com/watch?v=..."
On Ubuntu you might need the
libavcodec-extra-53 package for the MP3 conversion.
Freemake offer a Youtube converter to many different formats including mp3. Whilst I have never used it, I can vouch for their products as I have used both their Video Converter & Video Downloader with great success. Its a free download with no registration required.
Platforms: Windows XP/Vista/7/8
Their app work as modules where you can choose which feature to download & install, they have a full studio program which works as (audio video DVD converter for mobile and iPhone devices)
Free studio screenshot:
As for the youtube to mp3, all that you have to do is to copy the video link, and then paste it into the youtube mp3 app. After it completes, you will find the file (mp3) download in the output folder.
Youtube to mp3 screenshot:
You asked for ads free yet you didn't mentioned whether you are looking for a free or paid app, they have ads free version but you have to pay for it though.
I recommend SnipMP3.
It is a web-app rather than a desktop program. It also (last I tried anyways) didn't properly load on Firefox although it used to so that could have just been a security mixup or something (or due to me using an alpha Firefox - may investigate if I get some time later). Just tested with Chrome on Win 7 and it works fine there.
It does require you to enable Java and use it's Java applet.
For example see here - one of my favourite bands - you just insert the youtube address in the search bar, click
convert and then