update channel set name = CONCAT(name,' (DVB-C)') where not name like '%DVB-%' and sourceid in (select sourceid from videosource where name = 'DVB-C')  ;
update channel set name = CONCAT(name,' (DVB-T)') where not name like '%DVB-%' and sourceid in (select sourceid from videosource where name = 'DVB-T')  ;
update channel set name = CONCAT(name,' (Kab.)') where not name like '%Kab.%' and not name like '%Analog%' and sourceid in (select sourceid from videosource where name = 'Kabel Analog')  ;

update channel set visible = 0 where not chanid in ( select distinct(chanid) from program) ;
update channel set visible = 1 where  chanid in ( select distinct(chanid) from program) ;

This works of course only after you alread did get EPG data.

Either setting a region code

regionset /dev/sr0

(see https://help.ubuntu.com/community/RestrictedFormats/PlayingDVDs) or deleting all libdvdcss2 data in ~/.dvdcss for the respective DVD did help for me. (I did both, afterwards it worked. Propably you need both, in that order)

DVD

MythTV