my .02...

if you want vMix to issue any PTZ camera commands, and for the multi output capability you will likely need between 2 venues, i'd recommend either the 4k or Pro version of vMix. I like that you can buy into the lesser versions of vMix, and then can upgrade down the road without any financial penalty. So no harm in trying the less expensive versions first to see if they work for you.

controlling both vMix stations from one location is easily done with something like Bitfocus Companion or Central Control, or simply using a remote desktop solution to the remote vMix computer.

For controllers, I use both the TYST TY-1500HD for my main show, and 2x Companion/StreamDeck XL interfaced to everything for other duties. You can do without either, but sure makes it easier if you set it up well.

I always figure at least 10M upload speed for each 1080 feed I want to send out and set the outbound steam between 4-6M, usually leaves plenty of headroom for bandwidth. If you are sharing the internet source with other users (public wifi spot, office network, etc) then you may need considerably more upload/download speeds. Having your own internet source, and your own network(s) to control behind it is the most reliable way to do streaming business. Having access to the internet router for firewall port forwarding is almost a must these days.

To connect A/V at each end to the other, there are lots of ways depending on how many sources you want to share between ends, and how good your IT skills are. vMix call is the simplest way, and you can get full 1080 between copies of vMix. SRT feeds are an excellent solution, if you know how to manage the router port forwarding that is usually involved to get a successful connection. There are many ways at the end of the day to do this, but those 2 are probably the most often used around here.

Hi
Do you need to control the cameras remotely or will each camera have its own operator?

Really cool software!!! I took a look at the cost and it exceeds the churches budget. Is there an alternate more cost effective solution which would allow to network all the NDI cameras over the WAN connection and have them added to Vmix for control?

Thank you very much!

The TYST panel is simply a MIDI controller and is programmed using the vMix shortcuts/activators. This is best suited to controlling your local vMix. Yes you can change the function of any key on its surface, as long as it's something you can use vMix shortcuts for.

Companion is better suited for controlling multiple systems both local and remote, and uses networking to send commands to controlled devices. It allows you to attach commands to individual StreamDeck keys, and shines when you realize you can combine many commands onto a single key press. One example would be to add a control instance for your local vMix, another for your remote vMix, and a third to control your PTZ camera. Then one key can recall a stored PTZ position on a remote camera, select it as the active input on the remote vMix system, and then select the vMix call on your local vMix to see it in your show. In this example, you can do all of this with one copy of Companion, you just need a little networking know-how to connect to the remote vMix and camera.

For vMix call, yes you host a call from your main vMix. The remote vMix system would then "connect" to the call to send you the output of their system. This call would remain active as long as you need, sending you content as you control it as I described above.