The Architecture of Live Video Streaming: How HLS, DASH, and CDNs Actually Work
Live video streaming has become the backbone of modern entertainment infrastructure. Whether a user is watching a football match, joining a video conference, or consuming on-demand content, the underlying delivery pipeline is an extraordinary feat of distributed systems engineering. Yet most developers treat streaming as a black box. You point a video player at a URL and it works. But how does a…
The architecture of live video streaming comprises five distinct stages: Ingest, Transcoding, Packaging, CDN, and Client. The ingest stage involves receiving raw video feeds through RTMP (Real-Time Messaging Protocol) or SRT (Secure Reliable Transport). RTMP, originally developed by Adobe, operates over TCP port 1935, while SRT is a modern successor that provides encryption and Forward Error Correction (FEC) for improved reliability over unreliable WAN links.
The transcoding stage breaks down the single 4K feed into multiple renditions for various devices and network conditions. This process, known as the ABR Ladder, creates parallel encodes that cater to different resolutions, bitrates, and codecs. Lastly, the CDN (Content Delivery Network) and client stages deliver the video content to the end-users, optimizing for factors like latency, packet loss, and bandwidth availability.
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