I used to use Tube Sock for the mac for this purpose (YouTube vids conversion) but have lapsed of late, must give it another try. This is an alternative…
iTubeX Ultimate is a video downloader with the following features:
– Download YouTube Videos as a .flv or high-quality .mp4 file.
– Download .flv, .mp3, .divx and .swf files from almost all other video / animation websites.
– Convert the downloaded files for use with mobile phones and more!
To convert some filetypes, Perian has to be installed.
Perian is a free QuickTime Plug-in which adds support for more filetypes.
Click here to go to the Perian download page…
iTubeX Ultimate is available in English and Dutch and is Universal Binary.
You can try iTubeX Ultimate 5 times.
After your trial period has expired, you will have to buy a license ($7,50).