Editing dvds isn't simple so follow some tips from this site
http://www.videoforums.co.uk/reviews/faq
MiniDVD camcorders: Based on the same technology as miniDV camcorders, they produce equivalent quality pictures within the camera but you'll generally find that image quality per � is less than miniDV. Although ideal for convieniance, recording straight to DVD is a pain for editing. DVD uses MPEG2 encoding, which is more compressed using intraframe compression technology. This means achieving precise cuts and edits is a hard task. DVD cameras use USB transfer.
DVD camcorders are not recommended by digital director for video editing.
10) Editng MPEG and other highly compressed video sources - you can download a video of this guide.
Unlike the DV AVI files transferred from a miniDV camcorder, MPEG files can prove a pain to edit. And with miniDVD and MPEG4 camcorders gaining in popularity, a commonly asked question is how to edit these files in Adobe Premiere or other editing software. The easy (and expensive) answer is to buy an MPEG plugin or native MPEG editor such as MPEG video wizard - a review of MPEG video wizard is found on digital-director.co.uk. But there is a free alternative.