I am running a pair of identical vMix 4K systems as an A+B redundant pair, with a Blackmagic Micro (16 x 16) videohub feeding each of the 4 HD-SDI cameras to both systems, and switching the vMix Declink outputs to transmission. I also use a dual channel KVM to switch Keyboard, Mouse and Focusrite USB audio interface in the event of system failure.

I usually run both A & B systems in parallel, loading up the same preset and media from a shared NAS.

On the whole, all works very well, and switching between systems is very simple (two button pushes) and normal service can be resumed within a few seconds. The only issue is the expression of two vMixCall channels used in my preset. Obviously only one vMix system can be responsible for mastering the vMixCall channel.

Is there any logic (i.e last system loaded, or last system call manager was loaded) to how I can determine which system (A or B) will answer the call? obviously I want it to answer on the live system.

Keith

LucaL, doesn't look like anybody has a practical answer to this. My solution, I have set up two vMixcall rooms, one on each vMix system. I have then set up my own custom vMixcall front end webpage with the Room ID (Pin Number) embedded into the web page. As part of the CGI for the custom vMixcall front end the web server PING's my two vMix systems and if one fails, the Room ID (Pin Number) is replaced in the HTML with the Room ID (PIN Number) of the Vmix call channel set up on the second system. Its a bit dirty but it works.

Keith

- create your calls inputs
- save them as an independant project on your NAS
- on vMix 1, build your project as needed, sync it to vMix 2 and then append this vmixcall project to it
- if vMix1 fails, just append this calls project in vMix2

Not very nice but it should work