@ shulambert

Good luck with that!
Although the vMix software itself supports up to 1000 Inputs, vMix does not recommend more than 8 of those to be 1080p60 NDI sources on their HEDT Reference Systems, so getting 84 on one system and/or network is a bit of a "pipe dream":
- https://www.vmix.com/pro...nce-systems.aspx#diamond
I might suggest that you may be better off using the ZOOM integration feature in vMix 27 to pull off what you are suggesting, and even then, you will need a substantial network and internet connection to succeed.


Ice

@IceStream and @nikosman88

Thank you for your feedbacks.

The goal here is not to give all 80 guest participants the possibility to participate in the same time.

The 4 NDI PTZ 4K cameras will always be used to capture the amphitheater.
The 80 other monitors will be used to display the output program, so only 2 or 3 guests can participate in the same time and the 77 or 78 guest cameras will not be used. But as vMix is supposed to handle up to 1000 NDI inputs, the operator can select from the 80 ones, which 2, 3 guests to select.
Let me prepare one illustration draft and share with you.

Ok for sending same pgm output in 80 monitors may you need a videohub like the ones that blackmagicdesign has to route anything you need in any of the 80 monitors without other overload to your pc. To be able for the vmix operator to bring in guests in program as soon as possible,you need to have all these input in vmix. But if you have all these inputs in vmix with video and audio,this will consume bandwidth and resources,even they "sit" in vmix inputs.So you cant have all these input in vmix inputs,you need to have for example some ndi inputs and to these one when you need another guest,right click and select which one you need to pgm out.
So yes in theory may you are ok with your setup

Ok. so to understarnd.
1.Ndi ptz cameras inside vmix
2.Ndi guests cameras inside vmix
3.Then external out from vmix with a capture card,pgm out signal inside the osee,pgm out osee and then with hdmi splitters to monitors. Right?
Do you mind about latency? Because this path is have a noticeable latency. The most easy way to get from vmix IMAG is to get an out from your GPU and then send it to hdmi splitters or other similar hw or ndi out 1 and then connect to the monitors but is difficult to handle 80 ndi out plus the ndi in. Not 0 latency but personally i find it is good enough for doing talk shows. And for 80 monitors,depending also for distance between pc and monitor,i cannot tell on how many hdmi splitters/amplifiers and type of cables you will need for signal to be able to arrive in all monitors correctly, if you choose gpu out for monitoring.
4.Also really important is the sound. The guests from the classrooms will only send video and audio or be able to hear back you or other people from the amphitheater and other classrooms? Because if they must have return audio,this audio has to be mix minus to avoid hearing from the monitor speakers and themselves as this will create echo
So.. need more study in what you need to do. Maybe better option not an ndi but a conference like program like zoom that is integrated in vmix
On how many guests. As many your system can handle. For interactions see 1-4 of this post

You are right, let me design a complete illustration and share it to you.
Thanks.

With multicast (and a network that is capable of multicast) you can send out the mixed feed and the load will just be the one feed although 80 receivers get it. That is the nature of unicast (80x the bandwidth) to multicast (1x the bandwidth). To be honest it epends a lot on the used gear and the network topology. But this is the basic I refered to.
Please remember that vMix is sending out unicast and you have to change it to multicast. You can use the NDI tools for this.

Hello,

In the scenario of HDMI-based output program and according to OREI company, using their HDMI Extender Splitter will handle 80 screen monitors without issue.

After some investigations regarding network switches capacity on a NDI-based scenario, I've seen switches that are supposed to handle a total non-blocking throughput of 88 Gbps, means 176 Gbps switching capacity.
At NDI website, a typical NDI stream consisting of 1080 60P video yields a data rate up to 150 Mbps per stream, and if we have 80 NDI PTZ cameras, technically it should 80 X 150 Mbps = 12 Gbps which seems be logically ok. Your suggestions are welcomed.

Now I don't know if it will work by selecting up to 4 PTZ cameras NDI source at vMix over 80 sources.