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Looks to be $0.05 / realtime GB

What bandwidth does a typical video call use per hour?

First TB is free. I would assume at least 1.5 Mbps for HD so ~5.4 Gbph ... ~.7 GBph so 3.5¢ per hour if my math checks out.

Unclear if that would multiply by number of callers.

Depends what codec! For 1280x720 with a VMAF score of 90 this is the numbers I use.

* H264 - 1.25Mbps

* VP8 - 1.00Mbps

* VP9 - 700kbps

* AV1 - 550kbps