To convert DVD to your Samsung s8000 Smartphone, select the Apple > iPhone profile in DVD Catalyst. The created files will play just fine, however, to get the best possible quality, click on “Modify”, and change the screen size to 720×480, and increase the video quality to at least 700kbps (1000 recommended)

Based on specs found on http://www.gsmarena.com/samsung_s8000_jet-2835.php

edit:

Unfortunately, the JET is a little picky in screen resolution. While it does have an 800×480 screen resolution, it can not handle this as a video file resolution. Use 720×480.