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what is iptv ?
1.
IPTV Overview Presented by
Paul Ashun TV Platforms Group © BBC 2008
2.
IPTV Overview Chapters: 1. What
is IPTV (as opposed to internet TV) ? 2. What is VOD (as opposed to IPTV) 3. Middleware and Video 4. Common IPTV Models 5. Other factors 6. Questions © BBC 2008
3.
What is IPTV (and
what is internet TV) © BBC 2008
4.
1a - What
is IPTV • Still evolving • Digital TV delivered using technologies used for computer network. Internet Protocols (http, rtsp, igmp) • A TV like ‘quality of service’ (always on, reliable) • Can be ‘live’ or pre-recorded (on-demand) • Usually over a managed/closed network Eg. Virgin TV, Tiscali TV, BT Vision © BBC 2008
5.
1b - What
is Internet TV • Digital TV delivered using technologies used for computer network. Internet Protocols (http, rtsp, igcmp) • No guaranteed ‘quality of service’ • Usually delivered via open-internet / un-managed network Eg. YouTube, BBC iPlayer on browser/PC © BBC 2008
6.
1c – Managed
Networks Control over – bandwidth allocation – contention ratio – content } Controlled ‘quality of service’ © BBC 2008
7.
1d – Open
Internet (Unmanaged networks) – Variable bandwidth – Higher contention ratio (20:1) – Less control over content } Little control over ‘quality of service’ © BBC 2008
8.
1e – Open
Internet (Unmanaged networks) • The BBC is working to ensure quality of service with ISPs. This will possibly change the definition of IPTV through the consensus that the quality of service is good over the open internet © BBC 2008
9.
YouTube PC iPlayer FreeSat Virgin VOD Tiscali TV Orange TV BT
Vision Open Internet Managed Network TV iPlayer (on Virgin) © BBC 2008
10.
Copper wire / fibre Compression/ Encoding/ Encryption Head
end to Capture TV How to capture/create IPTV © BBC 2008
11.
Mobile Device Wifi / wimax Cable
Set-top Box Hybrid fibre coax Network ADSL Set-top Box Freesat Tiscali BT Vision [Orange TV] Virgin Computer Protocols - http - rtsp - igmp ADSL IPTV over the network cloud © BBC 2008
12.
Why IPTV and
not Broadcast • Two-way data flow (video on demand) • Greater personalisation / tailored advertising • Combined features – Voice over IP – Messaging/Recommendations – Chat around content © BBC 2008
13.
IPTV- Key Protocols •
HTTP • RTSP • IGMP Request Response play pause record Firefox, Internet Explorer Real Player, Windows Media Player (streamed video) (hyoer-text- transfer-protocol) (real time streaming protocol) - connecting to multicast stream (TV channel) - changing from one channel to another(internet group management protocol) © BBC 2008
14.
What is VOD © BBC
2008
15.
2a - What
is VOD • Select and watch video content (usually over a network) • Either content is streamed or downloaded with/to the application • Apps have a subset of VCR functionality including RWD, Pause, FFWD etc. • Push VOD – delivered to set top box from broadcaster © BBC 2008
16.
2b - What
is VOD • Not necessarily over IP. Eg. Push VOD • Push VOD – delivered to set top box from broadcaster Eg. BBC iPlayer, YouTube, BBC Archive, Rimokon quiz, Tiscali, BT vision © BBC 2008
17.
Middleware And Video Codecs © BBC
2008
18.
3a – Middleware –
Set-top box software that allows us to write applications – Affect application capabilities © BBC 2008
19.
3b – Middleware •
Middleware – MHEG – (Freeview / Freesat) – Liberate – (Virgin) – ICTV/other – (once trialled by Tiscali; used by US web sites) – HTML/JavaScript (KIT/Proprietary operators) – Mediaroom (BT Vision) © BBC 2008
20.
3c – Codecs •
Compression/Decompression • File extension specifies codec used to compress/decompress • Lossy/Lossless © BBC 2008
21.
3d – Codecs •
Codecs – H.264 – MPEG4 – MPEG2 – WMV9 © BBC 2008
22.
H.264 • 1. Up
to 50% in bit rate savings: Compared to H.263v2 (H.263+) or MPEG-4 Simple Profile, H.264 permits a reduction in bit rate by up to 50% for a similar degree of encoder optimization at most bit rates. • 2. High quality video: H.264 offers consistently good video quality at high and low bit rates. • 3. Error resilience: H.264 provides the tools necessary to deal with packet loss in packet networks and bit errors in error-prone wireless networks. • 4. Network friendliness: Through the Network Adaptation Layer, H.264 bit streams can be easily transported over different networks. © BBC 2008
23.
IPTV/Internet TV Platforms/Operators MHEG MHEG
1.06 turbo Liberate (Seac-change) Mediaroom (client-side Java) MIDDLEWARE NOAny – dependent on isp Dependant on ISP Freeview (other than BT vision) NOAny – dependent on isp Not implemented Freesat YESHybrid fibre co-ax Mpeg 2Virgin YESADSLh.264BT Vision YESADSLh.264Tiscali MANAGED NETWORK DELIVERY NETWORK CODECOPERATOR © BBC 2008
24.
Common IPTV/VOD models © BBC 2008
25.
Server (contains video) Server Side
Video / Client Side Application Streamed Video Contains: - application code previously downloaded Set Top Box Instructions for video (play, ff, rw, pause) are sent to server 4a – Common models Disadvantages -Slower to load video -Longer round trip to server battling against bandwidth Advantages -Greater capacity for video on servers than set-top/pc © BBC 2008
26.
Server (contains video and
app) Server Side Video / Server Side App Streamed Video AND Streamed Application contains: - no storage in the box Set Top Box Instructions for video (play, ff, rw, pause) AND to navigate the app are sent to server 4b – Common models Disadvantages -Slower to load video/app -Longer round trip to server battling against bandwidth /contention ratio Advantages -Greater capacity for video -Larger app size for more functionality © BBC 2008
27.
4c – Common
models Set Top Box/PVR Client Side App / Client Side Video contains: - application code previously downloaded - video previously downloaded Disadvantages -Inability to leverage server for capacity. Advantages -Quick seamless transitions between video and scenes. -Store app locally and take box from a to b (i.e. to a friends house) © BBC 2008
28.
Set Top Box/PVR Peer-to-
Peer Video / Client Side Application contains: - application code previously downloaded - video streamed from other pcs/boxes 4d – Common models video video video video Disadvantages -Longer round trip to through network Advantages -Leverage other PC/set- tops with the same video for speedy download © BBC 2008
29.
IPTV PC MOBILE STB BROWSER
APP MHEG 1.06 MHEG Turbo ICTV MEDIA ROOM Mozilla IE Windows Media Player Real Player Flash Liberate Middlewares on devices Joost Bablegum © BBC 2008
30.
Other Factors © BBC 2008
31.
5 – Other
Factors • Digital Rights Management (DRM) • Security (logging in / privacy) • Messaging • Mobile Devices • Authoring • Video Delivery • Games consoles • User experience & design © BBC 2008
32.
IPTV Overview Thanks for
your time Any Questions ? © BBC 2008
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