System Design · core
Streaming Media
CDN, HLS, transcoding pipeline.
Mental model
Video streaming is CDN plus adaptive bitrate (HLS or DASH). The origin server should never serve video directly to viewers; the player switches quality on the fly based on the user's bandwidth. Design for the user on bad wifi, not the demo.
How to study Streaming Media
Begin by restating the mental model in your own words, then connect it to a concrete system you have built or operated. Name the mechanism, the constraint it addresses, and the trade-off it introduces. Use System Design Primer, HTTP Live Streaming (Apple Developer), RFC 8216 — HTTP Live Streaming to check details, but close the source before writing your explanation. Retrieval is the learning step; rereading is only preparation.
Next, compare Streaming Media with the neighboring concepts in its roadmap. Ask what changes in correctness, latency, resource use, operability, and failure recovery. Complete Video streaming (Netflix-style) and preserve the command, input, output, and one failed attempt as evidence. Finish by explaining the idea without jargon to someone who has not studied the track.
Proof of understanding
- Explain the mechanism from first principles and identify the state it reads or changes.
- Give one situation where the concept is the right choice and one where it is not.
- Predict a realistic failure mode before running the drill, then compare the prediction with evidence.
- Connect the result to a roadmap or build artifact instead of treating the concept as isolated trivia.
Learn from primary sources
Practice and explain it back
Video streaming (Netflix-style)
Design a video-on-demand service: catalog browse, adaptive bitrate streaming, CDN distribution. Walk through what happens from play-button press to first frame on screen.
Expected evidence: CDN + manifest (HLS/DASH) flow + the bitrate-adaptation loop.
Open the interactive drill →Review prompts
- What does adaptive bitrate demand of the encoding pipeline?
Build evidence
Use a roadmap capstone to turn this concept into working evidence.
Prerequisites
Related concepts
None assigned yet.