Hi Jürgen,
first of all:
iMovie is a video edit app meant to work with firewire connected miniDV camcorders
iDVD is a videoDVD authoring and burning app, meant to work in collaboration of other iLife apps
DVD uses mpeg2 for compressing video, an end-of-the-road format, not meant for editing..
but there are some options:
get for 20$ the
Apple mpeg2 plugin
and for free the tool
Streamclip for converting mp1/2/4, divx, avi, vob...
other tools are:
*
DVDxDV, it has a 30d trial period (testdrive sets a watermark)... and cost 25$
*
Cinematize >60$
*
Mpeg2Works >25$ + Apple plug-in
http://danslagle.com/mac/iMovie/tips_tricks/6010.shtml
http://danslagle.com/mac/iMovie/tips_tricks/6018.shtml
or connect Your Camera to a DVD-player and copy to tape or import trough if Your Camera handles that...
for a beginner, I recommend DVDxDV... a one-click-only app, very Apple'ish
concerning quality, use Streamclip - is has some basic edit options WITHOUT converting the mpegs; due to the nature of mpegs, you can not edit with single-frame-accuracy; and you need an authoring app to create new .ifo etc files for a videoDVD.. try for free
Sizzle
hope, that helps...