I'm no expert but I wouldn't use just a simple cable..
Apparently HDMI needs to be amplified if it's split, ie it does need a powered splitter especially if you have long cables, such as 8-10M to your PJ
I suggest one of
these.. I've got their previous model and it works great.
(BTW, the same site also sells the single non-powered cable solutions but says they are not recommended for any cable length over 5m)
