Media streaming Joni Alhonen VBP07S 1/19

Multimedia, which is broadcasted simultaneously as it is played by the receiver 2/19

Contents History Technology – Codecs – On-demand and live streaming – Unicast and multicast IPTV WirelessHD Summary 3/19

History 1950s - First attempts to playback media on a computer TV and radio as mass medias In the 1980s computers powerful enough to play multimedia – Streaming not technically possible yet – No demand 80s -90s technology developing 4/19

Hardware development 5/19

History Early 90s - Mbone – Required special hardware and software – Rolling Stones concert – First online streamed broadcasts 6/19

History RealNetworks RealMedia – Media streaming pioneers – 1995 RealAudio 1996 Microsoft NetShow 1997 RealVideo 1998 Apple QuickTime 1999 NetShow => WindowsMedia 2000: 85% of online streaming material in real media format 7/19

History Problems at the change of the millenium – Real player not uesr friendly ->users deleting real player ->computer manufacturers did not pre-install – Windows and Apple – IT-bubble – > Other businesses took over 8/19

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History 2000s – Web speed and coverage – More processing power – Internet standardized: TCP/IP, HTTP, ja HTML – Internet commercialized – >more demand for streamable media Still developing: – Wireless devices – HD-quality – The above combined – >new challenges 10/19

Technology Codecs – Audio compression. Mp3, Vorbis, AAC – Video compression. H.263, V8 Encoded audio and video packed eg. FLV, WMV, QuickTimeMovie, MPEG-x Bit-flow sent from streaming server to receiver using transfer protocol such as RTSP Receiver can interact with the streaming server via control protocol such as RTCP 11/19

On-demand vs live-streaming Media can be broadcasted either live or previously recorded Live streaming – Broadcasted live or with a few second delay On-demand – Production has been saved previously and is broadcasted to the receiver on demand 12/19

On-demand vs live-streaming On-demand – Played right away – Or progressively Saved on disk while simultaneously played back – On the service providers server 13/19

On-demand vs live streaming 14/17

Technology Unicast vs Multicast Unicast – Sending media at a single, targeted receiver Multicast – Sending same media to multiple receivers. – Used in IPTV-broadcasts 15/19

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IPTV Streaming media + TV In Finland: Elisa, Welho, Sonera 2,5 Mbps speed required for SD-quality videostreaming Min. 10Mbps speed required for HD-quality Material on the service providers server – Does not require the user to have HDD-space for temporary storage 17/19

WirelessHD (WiHD) Standard for streaming HD-video for wireless devices -Sony, LG, Panasonic, Samsung, Toshiba behind the standard Competitors: Wireless High-definition Interface and Wireless HDMI No need to install extra cabling  beneficial! 18/19

Summary Media streaming used since the 90s – More demand with better technology Media streamed online for many purposes – Live streaming – On-demand Streamed media packed for broadcast and opened at the receiving end With new devices comes the demand for new technologies – HD-video wireless transfer 19/19