HLS/CDN Streaming inside out

Transcript

1. HLS/CDN Streaming inside out Extreamax 程沛科技 qrtt1
2. About Me • qrtt1 • a java programmer for backend service • one of the organizers for TWJUG • Info • https://github.com/qrtt1 • http://www.codedata.com.tw/author/qrtt1 • https://www.meetup.com/taiwanjug/
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4. 傳統串串流協定 • ཀ̘常⾒見見協定 • MMS (Microsoft) • RTP、RTSP (RealNetworks, Netscape) • RTMP (Adobe) ତίɰ੬ԈdШε͜ί publish
5. 傳統串串流協定 h Ꮄᓃ
   • 即時性佳（latency ⼩小） h ॹᓃ
   • 受限於 Media Server，導致不易易 scale out • Client 端需要特殊播放程式（Flash Player 或 Native Library） • 其它（firewall issue）
6. 即時串串流協定 • 即時 real time：使⽤用者不會明顯感覺到有時間差 • 準即時：使⽤用者略略知有時間差 • 偽即時：使⽤用者懶懶得想差多久了了 < 1 sec < 3 secs > 3 secs ၾԴ͜٫ʝਗ׌৷ٙᏐ͜d൳ცࠅуࣛ׌f from Ref [1]
7. 串串流協定的轉變 • 向標準靠攏 • ISO base media file format • mp4, mpeg-ts, mf4 container • decoder 能⽀支硬體加速 • {h264, h265}/ aac codec *6/.XKFGQ  /GFKC5QWTEG'ZVGPUKQP K15#PFTQKF0CVKXG5WRRQTV
8. 串串流協定的轉變 • 無狀狀態化 • 去除 session layer 的設計 • transport layer 向 HTTP 靠攏 • HTTP Based Protocol • HLS • MPEG-DASH • Smooth Streaming • HDS (Adobe HTTP Dynamic Streaming) 䶬㾶楃 VOD ⛑䍄Ⰸ⟆Ⰸ MyVideo FriDay ㉒櫔--68 twitch, livehouse.in
 LiTV
9. HLS
 HTTP Live streaming • 常⾒見見應⽤用 • ⃮Ⰻ槡要уࣛ互動的直播 • Video On Demand ⃮槡ⅳ▶ • Broadcast Video ⃮槡ⅳ▶
10. from Ref [2] HLS
 HTTP Live streaming #TEJKVGEVWTG
11. HLS
 HTTP Live streaming 2NC[NKUV from Ref [3]
12. HLS
 HTTP Live streaming #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 # Old-style integer duration; avoid for newer clients. #EXTINF:10, http://media.example.com/segment0.ts # New-style floating-point duration; use for modern clients. #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.5, http://media.example.com/segment2.ts #EXT-X-ENDLIST 81&2NC[NKUV from Ref [3]
13. HLS
 HTTP Live streaming #EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:26 #EXTINF:9.901, http://media.example.com/wifi/segment26.ts #EXTINF:9.901, http://media.example.com/wifi/segment27.ts #EXTINF:9.501, http://media.example.com/wifi/segment28.ts #EXT-X-ENDLIST .KXG2NC[NKUV .KXG2NC[NKUV㽳㧪':6:'0&.+56 䡗2NC[NKUV㧕㢑苌5'37'0%'槡  from Ref [3]
14. HLS 與 CDN ⻨⃡緈䥥*6625GTXGT碍㓱%&0 ⼒⹭副Ⅷ⢯獑 2TQHKNKPI/QPKVQTKPI /WNVK%&0U
15. HLS Recap New in 2016
 HTTP Live streaming from Ref [4] • MPEG-4 Fragment Support in HLS (DGVC) • 應該是感受到 MPEG-DASH 帶來來的壓⼒力力 • MP4 比起 MPEG-TS 要精實，佔較少空間
16. HLS Recap New in 2016
 HTTP Live streaming from Ref [4] • Offline HLS • ⼿手機開航空模式時很需要！ • ⽀支援離線加解密驗證
17. HLS
 HTTP Live streaming • Tools • HTTP Live Streaming Tools http://apple.co/ 2haDPJ5 • FFMpeg • Cloud Service • Zencoder • wowza on {AWS, AZURE, GCP} • AWS Elastic Transocder
18. HLS
 HTTP Live streaming .KXG&GOQHQT.KXG*662.KXG5VTGCOKPI • Twitch’s HLS
 https://www.youtube.com/watch? v=uLmMPdYEnbg&feature=youtu.be • HLS tips for latency tuning • segment duration • Group of pictures -G[HTCOGKPVGTXCNU 'PEQFGT 5GIOGPVGT
19. HLS
 HTTP Live streaming VU VU VU VU VU UGIOGPVFWTCVKQP NCVGPE[ UVCTVVQNKXG
20. Q & A
21. Reference • [1] 如何实现1080P延迟低于500ms的实时超清直播传输技术 http://bit.ly/ 2gYs6Ig • [2] HTTP Live Streaming Overview http://apple.co/2h6Jyh7 • [3] About HTTP Live Streaming http://apple.co/2idzAIF • [4] What's New in HTTP Live Streaming http://apple.co/2harYKX