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Streaming Video in iOS
Nirbhay K
http://above-inc.com
CocoaHeads - Cocoa on the Brain
Streaming Apps Overview
CNBC Pro Netflix Hulu +
Twitch.tvUstream.tvJustin.tv
Technology
• HLS (HTTP Live Streaming) - [Apple Inc.]• Progressive Download• Streaming on Other Platforms– Smooth Streaming - [Microsoft]– HDS (HTTP Dynamic Streaming) - [Adobe]– RTMP (Real Time Messaging Protocol) – [Adobe]– RTP (Real Time Transport Protocol)– RTCP (RTP Control Protocol)– RTSP (Real Time Streaming Protocol) = RTP+RTCP
MPEG–DASH HTTP Streaming Standard
DASH - Dynamic Adaptive Streaming over HTTP .
Courtesy - http://xkcd.com/927/
Problems with streaming on iOS
• Network • Do’s/Don’ts [Apple restrictions]
MEH.. !!
How do I get my streaming app working??
Todays menu
• Streaming Live v/s Streaming On Demand• How HLS works• Setting up HLS on Server• Streaming HLS in iOS• Using Wowza Server to deliver multi device
streaming
HLS Architecture
• Server components
• Distribution components
• Client components
HLS Architecture
• Server Components– Media Encoder
– Stream Segmenter• Media Segment File
• Index Files (m3u8 playlists)
– File Segmenter
HLS Architecture
• Distribution Components
File Ext. Mime Type
.m3u8 application/x-mpegURL or vnd.apple.mpegURL
.ts Video/MP2T
HLS Architecture
• Client components
– End user media player software
– Custom player
– HTML5 Browser
HLS Architecture
#EXTM3U#EXT-X-TARGETDURATION:10#EXT-X-VERSION:3#EXT-X-MEDIA-SEQUENCE:0#EXT-X-PLAYLIST-TYPE:VOD#EXTINF:10.00000,fileSequence0.ts#EXTINF:10.00000,fileSequence1.ts#EXTINF:10.00000, […]#EXT-X-ENDLIST
• Simple Index File (m3u8)
HLS Architecture
• Simple Index File (m3u8)
M3U8 fomat,Just a list of files to play
#EXTM3U#EXT-X-TARGETDURATION:10#EXT-X-VERSION:3#EXT-X-MEDIA-SEQUENCE:0#EXT-X-PLAYLIST-TYPE:VOD#EXTINF:10.00000,fileSequence0.ts#EXTINF:10.00000,fileSequence1.ts#EXTINF:10.00000, […]#EXT-X-ENDLIST
HLS Architecture
• Simple Index File (m3u8)
M3U8 fomat,Just a list of files to play
Metadata tags describing the content
#EXTM3U#EXT-X-TARGETDURATION:10#EXT-X-VERSION:3#EXT-X-MEDIA-SEQUENCE:0#EXT-X-PLAYLIST-TYPE:VOD#EXTINF:10.00000,fileSequence0.ts#EXTINF:10.00000,fileSequence1.ts#EXTINF:10.00000, […]#EXT-X-ENDLIST
Each segment file preceded by metadata eg.#EXTINF:10 (depicts segment duration)
HLS Architecture
• Simple Index File (m3u8)
M3U8 fomat,Just a list of files to play
Metadata tags describing the content
#EXTM3U#EXT-X-TARGETDURATION:10#EXT-X-VERSION:3#EXT-X-MEDIA-SEQUENCE:0#EXT-X-PLAYLIST-TYPE:VOD#EXTINF:10.00000,fileSequence0.ts#EXTINF:10.00000,fileSequence1.ts#EXTINF:10.00000, […]#EXT-X-ENDLIST
If there is no end tag client will treat this as live stream
Each segment file preceded by metadata eg.#EXTINF:10 (depicts segment duration)
HLS Architecture
• Simple Index File (m3u8)
M3U8 fomat,Just a list of files to play
Metadata tags describing the content
#EXTM3U#EXT-X-TARGETDURATION:10#EXT-X-VERSION:3#EXT-X-MEDIA-SEQUENCE:0#EXT-X-PLAYLIST-TYPE:VOD#EXTINF:10.00000,fileSequence0.ts#EXTINF:10.00000,fileSequence1.ts#EXTINF:10.00000, […]#EXT-X-ENDLIST
HLS ArchitectureBasic Configuration Diagram
Courtesy - http://apple.com/
HLS Specification
HTTP Live Streaming Specification
TOOLS• Media segmenter– File Segmenter
– Stream segmenter (Will not cover it today)
• Streaming Tools – Download link
mediafilesegmenter -f <foldername> <source file>.mp4
mediastreamsegmenter -s 3 -D -f <foldername> <live encoder url>
Setting up HLS with Tools
File Segmenter
{ Demo }
Distributing HLS with Webservers
• Apache • Nginx• Any webserver/CDN
{ Demo }
What is Wowza Server
Wowza Media Systems® provides the next
generation of media streaming software which
simplifies the highest quality live and on-
demand video streaming to any Internet-
connected device.
Why Wowza• Integrated Live Transcoder
• Multi protocol nDVR
• Multi Platform DRM
• Streaming to multiple devices including IPTV devices
• Restreaming of IP cameras or other sources
• Encoder for SHOUTcast / ICEcast restreaming
• Supports all major server OS
• Recording of live streams
• Multiparty video conferencing
• 10GBps per server performance
Life Before Wowza
Courtesy - http://www.telestream.net/
Wowza Live Stream delivery Diagram
Courtesy - http://www.wowza.com/
Setting up Wowza Server
{ Demo }
Live cam publishing on Wowza
{ Demo }
Consume Wowza stream
{ Demo }
Code Links
• iOS HLS Client– https://github.com/NirbhayK/Streamingplayer
• Factime camera broadcast using VLC (script)– https://github.com/NirbhayK/vlcbroadcastscript
Q&A
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