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What would the hardware requirements for such a stack be?

Last I read was that synapse requires a lot to memory and I guess that managing audio/video streams will be cpu intensive.

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I'm running Mattermost and Jitsi for my employer on a $20 droplet (2 vCPU/4GB RAM) and it works like a champ. Meetings of 5-10 are common, but we've run meetings larger than that too. As a facilitator of 1:1 adhoc meetings, it's basically zero overhead, because the server just coordinates a P2P connection then gets out of the way.

I have an old R710 with 24 cores and 32GB I got on ebay for $200 in my dining room with 10mbits upload/100 download and it works great. bought my .me domain for $5. It's a wonderful time to be alive.

For how many users?

I've run 6 on jitsi.

I’ve run 10-12 users with video and desktop screen sharing on a 6 core azure vm with between 20-30% cpu load with spikes to 46%. It also depends a bit on the adaptive bit rate. Image quality of FaceTime is higher than Jitsi.

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