On a Mac:

1. Open iDVD
2. Click "Create New Project"
3. Save it.
4. Drag the video clip into iDVD.
5. If you don't want a menu, click View -> Show Map. Then, arrange the video clip before the menu, click it, click Advanced -> Loop.
6. Burn.

You can also use the third party software, but please try it before buying since there are lots of low quality FLV to DVD converters on the market!

Hope it can help you