OnAir uses multiple different platofrms to stream and show videos to attendee's the requirements for the systems can be found below.
Zoom
https://support.zoom.us/hc/en-us/articles/201362023-System-requirements-for-Windows-macOS-and-Linux
Vimeo
https://vimeo.zendesk.com/hc/en-us/articles/224968848-Playback-quality-and-buffering-issues
Twillio
https://support.twilio.com/hc/en-us/articles/115007485348-Bandwidth-consumption-and-usage-with-Twilio-Programmable-Video-
Youtube