Live Streaming Architecture: Ingest, Transcoding, and Delivery at Scale

The 3-Second Rule That Costs Millions

When a viewer clicks play on a live stream, the platform has roughly 3 seconds before they bounce. That constraint drives every architectural decision in live streaming systems. Unlike VOD (video on demand), you can’t pre-transcode everything. The stream doesn’t exist until someone starts broadcasting, and you need to simultaneously ingest, process, and deliver to potentially millions of viewers with sub-second coordination across continents. A single bottleneck in this pipeline causes buffering, and buffering kills engagement.