Mike Tyson vs. Jake Paul was live-streamed on Netflix yesterday.

How does that streaming go, from technical perspective?

Let’s break down the typical tech stack of a live-streaming system.

Live streaming is challenging because the video content is sent over the internet in near real-time. Video processing is compute-intensive. Sending a large volume of video content over the internet takes time. These factors make live streaming challenging.

The diagram below explains what happens behind the scenes to make this possible.

Step 1: The streamer starts their stream. The source could be any video and audio source wired up to an encoder

Step 2: To provide the best upload condition for the streamer, most live streaming platforms provide point-of-presence servers worldwide. The streamer connects to a point-of-presence server closest to them.

Step 3: The incoming video stream is transcoded to different resolutions, and divided into smaller video segments a few seconds in length.

Step 4: The video segments are packaged into different live streaming formats that video players can understand. The most common live-streaming format is HLS, or HTTP Live Streaming.

Step 5: The resulting HLS manifest and video chunks from the packaging step are cached by the CDN.

Step 6: Finally, the video starts to arrive at the viewer’s video player.

Step 7-8: To support replay, videos can be optionally stored in storage such as Amazon S3.

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