As you want to save youtube videos and convert them, you can use …
As you want to save youtube videos and convert them, you can use the wondershare youtube downloader that I have been using, it can help you.
(1), download youtube videos with wondershare youtube downloader
first:add url
second:set the path of saving download files
third:start to download
(2), convert the videos to mp4, mpg, wma,mp3 etc that your devices supported.
one step: select the file which you want to convert;
second step: click the convert button and set the conversion formats and saving path
third: start to convert.
Another, you install it, you will find a youtube player, that can view youtube videos that you download.
http://www.flash-on-tv.com/youtube-downloader.html (free download)