The following package cannot be installed because it depends on packages that are older than the installed ones: mythtv-setup-0.27.4-20141022.9.mga6
I just installed mythtv-setup-0.27.4-20141022.9.mga6.x86_64 without problems with dnf. Even if I forgot to first update my local mirror (it was over 10 hours ago since it was last synced), I don't see on the changelog ml that any of the dependencies I installed was updated. Can you please run, as root urpmi.update -a and then urpmi mythtv-setup 2>&1 | tee mythtv-setup.txt and then attach mythtv-setup.txt to this bug report
Keywords: (none) => NEEDINFOCC: (none) => marja11
This turned out to be a conflict between regular rpms and a tainted one. Now resolved.
Status: NEW => RESOLVEDResolution: (none) => FIXED