we already know that only some mpeg can be played with dk/dp while
some just show an error message at the end of the downloading, even
if their size is under the limit.
now if you want to know exactly how a mpeg must be encoded to be
displayed properly you HAVE to read this page, its in russian but
juggling between the original page and the babelfish translation
could help you getting the most important parts
http://al32gabby.tripod.com/soft/video.htm
its VERY usefull for webmasters like me who wish to make their mpeg
files viewable for dcers too. you can use TMPGEnc to reencode your
vids, tested with some files of my "fun" section and it works great