Zoom: Real-Time Video Infrastructure & Multimedia Routing
Connect millions of simultaneous video callers: Custom UDP transport protocols, Multimedia Routing nodes (MMRs), Dynamic quality downgrading, and global edge POPs.
01.1. The Real-Time Video Latency Challenge: Sub-150ms Conversational Threshold
Interactive video conferencing operates under strict human biological latency constraints:
- In two-way human conversation, if round-trip audio/video latency exceeds 150 to 200 milliseconds, speakers inadvertently talk over one another, creating conversational disruption.
- Unlike video-on-demand streaming (YouTube/Netflix), which can buffer 30 seconds of video chunks ahead of time, real-time conferencing cannot buffer data. Packets that arrive 200ms late are useless and must be dropped.
During the 2020 pandemic, Zoom scaled from 10 million to over 300 million daily meeting participants within months. They achieved this extreme scale by fundamentally departing from traditional video conferencing architectures.
Zoom Global Multimedia Routing (MMR) & Simulcast Architecture 🎥
Zoom Global Multimedia Routing (MMR) & Simulcast Architecture 🎥
Lightweight Selective Forwarding Units (SFUs) routing custom UDP packets with Forward Error Correction over dedicated fiber backbones.
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