The key word is "should" work. I run a powered splitter in my HTPC setup, splitting the PC video output between my AV amp and a direct TV connection. The DirecTV DVR connects to the AV amp as well. You can read about the gyrations I went through in this thread:
It mostly works fine, but every few weeks something in the system gets upset and then it takes a little work to reset things. The first connection I'll lose is the PC->AVamp->TV connection, I'll get no video display. The PC->TV connection seems to work all the time. Usually just unplugging/replugging HDMI cables will fix this or at most plugging the AVamp cable back into the TV then back to the amp. But every once in a while, the AVamp HDMI problem light will start flashing when hooked to the PC/splitter signal and at that point, I may also lose the DVR connection as well. In that case, usually a power off/power on cycle of the TV, amp and DVR will clear that up. Not sure what triggers these various issues, it'll work perfect one day then the next day some box decides it is not happy and stops working.
I have ordered an HDMI Detective box to run off the PC output to let it only see one good sink (I'll try loading the EDIDs off both the AVamp and the TV (both Sony Bravia models) and then see if that keeps the PC output happy to see if that makes the problem go away. I wish I could find something like the trouble code scanner you can use for a car engine computer to plug into the system and get a read out of what the problem is. The other thing I might try is to remove the splitter for a while and see if the problem persists or not.
With the 1080i/p issue, you'll get the least common resolution out of the splitter, so both TVs will only see up to 1080i. And you'll also get the least common audio capability as well. This is what initially prompted my use of a splitter as I get 7.1 audio via the AVamp, but only 2.0 through the TV. With the splitter hooked to both I only get 2.0 audio over HDMI. I guess this is part of the HDMI spec, the signal must limit itself to the lowest capable device in the chain.Edited by 4Crawler - 5/18/13 at 11:56am