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Live Streaming WebRTC

⬢ 層級 2技術
中等
薪資影響
3 個月
學習時長
困難
難度
12
職業
一覽

WebRTC is a browser API for peer-to-peer video, audio, and data streaming. Unlike RTMP or HLS (which introduce 3-30 second latency), WebRTC achieves <1 second latency. Companies use it for live gaming, telehealth, remote collaboration, and interactive broadcasts. Building WebRTC infrastructure requires understanding signaling, STUN/TURN servers, codec negotiation, and bandwidth management. Mastery takes 6-8 weeks. WebRTC engineers command 20-30% salary premium because the infrastructure is complex and production deployment is non-trivial.

什麼是 Live Streaming WebRTC

WebRTC is a browser-native API for real-time peer-to-peer (P2P) communication: video, audio, and data. Unlike traditional streaming (RTMP, HLS), WebRTC achieves sub-second latency by avoiding media servers (when possible). Two browsers connect directly, exchange video/audio via an encrypted tunnel. For larger audiences, WebRTC flows through a media server (Janus, Kurento) which relays to viewers. WebRTC handles codec negotiation, bandwidth adaptation, and packet loss recovery automatically. Live streaming with traditional protocols (RTMP, HLS) introduces 3-30 second delays due to encoding, buffering, and edge distribution. For interactive applications (gaming tournaments, live auctions, telehealth, remote collaboration), that delay is unacceptable. WebRTC enables true real-time. Building WebRTC infrastructure is complex (signaling, STUN/TURN, codec management) but the payoff is immense: sub-second latency at scale. The skill is scarce and well-compensated.

🔧 工具與生態
WebRTC APIJavaScriptSignaling server (Node.js)Janus GatewayPion (Go)STUN/TURN serversChrome DevTools WebRTCFFmpeg

💰 各地區薪資

地區初級中級高級
USA$95,000$155,000$240,000
UK£58,000£95,000£145,000
EU€62,000€105,000€160,000
CANADACA$100,000CA$165,000CA$255,000

❓ 常見問題

Why use WebRTC instead of RTMP or HLS?
Latency. RTMP/HLS = 3-30 seconds (buffering, encoding delay). WebRTC = <1 second. For interactive broadcasts (gaming, auctions, sports), low latency is critical. RTMP/HLS is simpler but slower.
What's signaling and why do I need a server?
Browsers don't know each other's IP addresses. Signaling server exchanges connection info (SDP offers, ICE candidates) between peers. Signaling server = matchmaker. Once connection is established, video flows peer-to-peer (no server needed).
What are STUN and TURN servers?
STUN server helps you discover your public IP (if you're behind a NAT/firewall). TURN server relays traffic if direct peer connection fails. Most WebRTC deployments need both. STUN is cheap; TURN is expensive (bandwidth).
Can WebRTC handle 1000+ viewers?
Not via peer-to-peer (too much network traffic). Use WebRTC from broadcaster to media server, then server broadcasts to viewers via HLS. Or use SFU (Selective Forwarding Unit) for selective peer relay.
What's codec negotiation and why does it matter?
Browser A wants to use H264; Browser B wants VP9. Both must agree on codec before streaming. Negotiation happens in SDP exchange. If no common codec, stream fails. Always have fallback codec (H264 for compatibility).

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