I found a new script to grab epg-data from prisma.de.
It works great and it is much faster than tvtoday.
download it from herer: http://www.hamstaman.lxserv.de/mythtv/epg/
you have to do only little changes:

Put the file "tv_grab_de_prisma" and "xmltv_prisma"
to "/usr/bin/" (not "/usr/local/bin")

cd to /usr/bin
type: tv_grab_de_prisma --configure --gui (or without --gui if you dont want a gui)

and type: ln -s tv_grab_de_prisma tv_grab_de

I changed the xmltvid in webmin to the ids witch are written in the file channel_ids witch come with the epgpacket

now you can use mythfilldatabase.