tedkazm wrote:My question is, why on an ATEM only HDMI camera inputs on 1 to 4 and SDI input on 5 to 8 ???
It limits you to a 4 camera input if you have an SDI only.
?????
The ATEM 1 and the ATEM TVS have eight physical inputs: 1-4 are HDMI and 5-8 are SDI. The tally mapping reflects this -- that is, for each physical input there's a unique tally relay assigned. You aren't missing any potential tally functionality. Just pick the relays that correspond with whatever physical inputs you are using.
The ATEM 2 has 16 physical inputs, all SDI if I remember correctly; you can map two GPI & Tally interface boxes to activate on inputs 1-8 (for the first box) and 9-16 (for the second box).
I don't see how this creates a limitation, since there is always a tally relay available for each physical input.
-- Jeff