I am using Ligawo HDMI splitter for this task.
Working like a charm with RaspBMC / RPi1 in one living room.
Worked not that good with OSMC / RPi2 in the other living room. Did a lot of cross-exchanging, trying other kodi distro and so on, but was never able to find out, why (see here sound-away-after-tv-off-on) it only appeared with this combination. In between the RPi2 used to show the rainbow square with no reason, so I exchanged the RPi2 - but I can’t tell if the problem still appears, because I was too lazy to insert the splitter again. Fuckin’ lazy dude, I am, right.
