Written by MANGESH MANDLIK
YouTube System Design: From Video Upload to Global Playback A viewer presses Play. A few seconds later, video is streaming smoothly, even on a changing mobile network. That looks simple until you consider what happened before the first frame: a creator uploaded a large file over an unreliable connection; the platform validated it, transcoded it into compatible formats, published a consistent set of segments, and distributed those bytes across a global caching network. Designing a YouTube...