Go here...
http://javimoya.com/blog/youtube_en.php
...put the youtube link --
http://youtube.com/watch?v=IgnpK4bwRZo -- in the entry box. Click the download button to the right of the box. When the download link button appears, right click with your mouse and select Save Target As. Rename the file to whatever you want to call it and make sure to tack on the extension .flv at the end.
Then go to...
http://www.softpedia.com/get/Multimedia ... orge.shtml
...and download CinemaForge. When you get that set up on your computer and it's up and running, click on frequency and change to 44100, click on channels and change to stereo, click on thumbnails and change to None (and sometimes it's a good idea to change the frame size from Same to 800x600) and after you've done all that, click the folder button to the right of the Input box, browse to wherever it is you saved the Youtube file to your computer and import it in. When the filename shows up in the Input box, click the Doc Type button to the right of the Output box and click Motion Picture Experts Group (mpeg). Voila.