An Introduction To HLS (HTTP live streaming)
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A brief overview of HLS (http live streaming). These slides are from a lightning talk given at a local meetup.
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An Introduction To HLS (HTTP live streaming)
- 1. Intro To HLS (http live streaming) Rand Graham rmcore.com
- 2. Why Should You Care About HLS? Used to stream the 2014 World Cup Advantages ◦ Uses Standard Web Server ◦ ABR (Adaptive Bit Rate) ◦ Built into iOS and OS X photo courtesy: warrenski
- 3. Overview See: Draft of RFC Pass a URL to a play list file Transport stream .TS container Preferred codecs: H.264 AAC Block Diagram from Apple
- 4. Sample Playlist File .m3u8 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-VERSION:3 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-PLAYLIST-TYPE:VOD #EXT-X-INDEPENDENT-SEGMENTS #EXTINF:8.40000, bb0.ts #EXTINF:7.68000, bb1.ts #EXTINF:9.68000, bb2.ts #EXT-X-ENDLIST
- 5. Tools To Create Stream Files ffmpeg Apple Tools: mediastreamsegmenter mediafilesegmenter mediastreamvalidator
- 6. Actual ffmpeg command $ ffmpeg -re -i input.mkv -vcodec libx264 -preset veryfast -maxrate 3000k -bufsize 6000k -pix_fmt yuv420p -g 50 -acodec libmp3lame -b:a 128k -ac 2 -ar 44100 -f flv rtmp://live.justin.tv/app/<stream key> -ZOMG! if you think this is complicated -have you tried reading the ffmpeg source code?
- 7. Is it cross platform? Built into iOS JavaScript: videojs, clappr Android: ExoPlayer Desktop: VLC
- 9. Connect with me on twitter: @rdg_rmcore Read more at my website: http://rmcore.com/
- 10. CREDITS Special thanks to all the people who made and released these awesome resources for free: ◦ Presentation template by SlidesCarnival ◦ Photo Credits: ◦ World Cup photo by warrenski ◦ HLS block diagram by Apple ◦ Ultimate swiss army knife ◦ Will It Blend on Youtube
Editor's Notes
- Write up of World Cup streaming architecture: http://leandromoreira.com.br/2015/04/26/fifa-2014-world-cup-live-stream-architecture/ For testing the simple web server that comes with python is sufficient. python -m SimpleHTTPServer
- Segments are not exactly 10 seconds due to video compression algorithms. The files are broken on a “key frame” boundary. Key frames are full video frames other frames are computed as a diff against the key frame.
- Be sure to read the reviews of the ultimate swiss army knife: http://www.amazon.com/Wenger-16999-Swiss-Knife-Giant/dp/B001DZTJRQ/