I found a thread saying the e-tobi.net was replaced by packages.e-tobi.net.
I change files:
/etc/apt/sources.list.d/omv-extras-org-stoneburner.list
and
/etc/apt/sources.list.d/omv-extras-org-stoneburner.list.save
# VDR repo
deb http://packages.omv-extras.org/debian/ stoneburner-vdr main
#deb https://e-tobi.net/vdr-experimental/ wheezy addons base vdr-multipatch
deb https://packages.e-tobi.net/vdr-experimental/ wheezy addons base vdr-multipatch
That solved the problem.