NONONONONONONONONONO!!!!!!!!!!!!!!!!!!!!!!!!
Go to this website: www.mediaconverter.org
Enter the URL directly and select .avi from the drop down menu. Then when it says download or something, make sure you right-click and choose save link as, or it might open the video in the browser (for some people), and you will need to do it again.
Then you can use BatchDPG, THE best converter. I used it to convert Simpsons Season 1 and half of Season 2 now and it's working just fine.
EDIT: Other websites might work fine, but this website is the best. At least it's cleaner than most sites, more professional.