Date post: | 04-Apr-2018 |
Category: |
Documents |
Upload: | kenneth-griffin |
View: | 219 times |
Download: | 0 times |
of 18
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
1/18
IPTV Related Technolo ies
ZTE University
Contents
Digital TV Technology
Video Encoding/Decoding Technology
Streaming Media Technology
IPTV Bearer Network Technology
Digital Right Management (DRM) Technology
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
2/18
En c o d e r
Headend
Service Operation Platform
DTV source
CA\ DRM
IPTV Architecture
CDN edge nodeCDN edge node
IP Networks
DTV
Technology
CDN edge node
Access network
Access networkAccess network
STB
STB
STB
Digital TV Technology Definition
Digital Television (DTV) technology is a new generationtelevision technology that adopts digital encoding andranspor ng ec no og es or e co ec ng, recor ng,broadcasting, transmitting and receiving of the TVprograms. It includes three parts: information source(transmitting end), information channel(transporting/storing) and information destination (receivingend).
DTV Categories
,categorized into Standard Definition Television (SDTV)and High Definition Television (HDTV). SDTV and HDTVwill coexist for quite a long period to satisfy differentcustomers demands.
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
3/18
DTV's Advantages
Compared with analog TV, DTV has followingadvantages:
High-resolution TV image: comparable with DVD(lowest: 1280x720, highest: 1920x1080)
High quality acoustics
Rich of programs, high usage rate of wired network
High anti-interference ability, stable image
, ,stock information, online trade, distant learning, etc.
What is Standard Definition? SDTV
Standard Definition Television
Resolution and aspect ratio format are similar to analog TV
Aspect ratio 4:3 with resolution of 480i or 480p
Analog TV
PAL: 625 lines 25 frames/s
NTSC: 525 lines 30 frames/s
Full D1
PAL720x576Phase Alternating Line
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
4/18
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
5/18
Bandwidth of High-definition Video
High-definition video source 1920x1080i/1080p
1280x720p
Bandwidth
MPEG212~20 Mbps
MPEG4 or WMV98~12 Mbps
H.2647~8 Mbps
Sub-conclusion
DTV includes: SDTV, HDTV
SDTV: 480i, 480P
HDTV: 720P, 1080i, 1080P
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
6/18
Contents
Digital TV Technology
Streaming Media Technology
IPTV Bearer Network Technology
Digital Right Management (DRM) Technology
Huge data of informationHuge data of information
Features of Video Services
288 lines288 lines
288 lines288 lines
ne:ne:
360 pixels360 pixels
ne:ne:
360 pixels360 pixelsPixel:Pixel:
24 bits24 bits
Pixel:Pixel:
24 bits24 bitsFrame rateFrame rate
30fps30fps
Frame rateFrame rate
30fps30fps
288X360X24X30=
174.65Mbit
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
7/18
Video Encoding/Decoding Technology
MPEG-2: Popularly used internationally
MPEG-4: Popularly used domestically
WMV9: Internationally
H.264: Mainstream of the future
AVS: China Standard
Evolution of Video Encoding/Decoding Standards
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
8/18
H.264
Compared with other standards, saved ratio of bitrate
Video Encoding/Decoding Technology-AVS
AVS is a proprietary intellectual property of China.Its coding efficiency is 2~3 times higher than
- , equ va en o . . n a on, sbased on a concise technology design, and therealization complexity of chips is lower than that ofH.264.
H.264 is only a video codec standard. While AVS
, ,audio, and copyright management, which canprovide comprehensive solutions for digital video& audio industry.
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
9/18
Video Encoding/Decoding Technology
China Standard AVS
Disadvantages of AVS: MPEG-4 and H.264 are mature standards that have
een commerc a y app e on a arge sca e ointernational market and domestic IPTV industry.Therefore, it is very important to increase theindustrialization speed of AVS.
Contents
Digital TV Technology
Streaming Media Technology
IPTV Bearer Network Technology
Digital Right Management (DRM) Technology
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
10/18
Streaming Media Technology
At the narrow band time, due to slow Internet speed, video files have tobe downloaded to local before playing. It not only wastes time and diskspace, but also cannot meet the demand of play continuity.
Based on this demand, streaming media appears. It solves the play
continuity problem by simultaneously downloading, buffering andplaying the video file.
Download: File File
Streaming media:Frame 1Frame 2Frame 3Frame 4Frame 5
Transport Protocols of Streaming Media
RTP: Real Time Transport Protocol
RTCPReal Time Control Protocol
RTSPReal Time Streaming Protocol
RSVPResource ReSerVation Protocol
UDP User Datagram Protocol
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
11/18
RTP/RTCP
RTP is a transport protocol of multimedia dataflow used for Internet/Intranet
RTP is used for the one-to-one or one-to-manytransport, providing time information andsynchronization of media streams.
Generally, RTP adopts UDP to transport data,especially for wireless environment.
RTP can be applied on TCP or ATM protocol as
well.
RTP/RTCP
RTP does not guarantee the sequencing deliveryof packets, neither does it provide traffic andconges on con ro . owever, oes.
RTCP together with RTP provides traffic controland congestion control services.
RTP cooperating with RTCP optimizes thetransport efficiency based on effective feedbacks
an m n m ze expenses, w c s su ta e orreal-time data transport on Internet.
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
12/18
RSVP
Compared with traditional data transport, thetransport of streaming media data is much moresens t ve to atency. ere ore, guaranteebandwidth is not enough for the transport of highquality audio & video data.
RSVP is designed to reserve resources acrossnetwork.
can reserve a ract on o networ resources
(bandwidth) to provide QoS for the transport ofstreaming media.
RTSP RTSP was introduced by Real Networks and Netscape together. It
defines how to effectively transport media data for one-to-manyapplication. RTSP adopts TCP or RTP to complete data transport.
Compared with HTTP, RTSP is suitable for the transport of multimedia
data, while HTTP is suitable for the transport of HTML text. In addition,HTTP is a uni-directional service (The client machine sends the HTTP
request and the server responses the request). While RTSP is a bi-directional service, both the client machine and server can send therequest.
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
13/18
Sub-conclusion
Streaming media technology is different from filedownload technology.
Streaming media technology is used tocontinuously deliver frames of video over IPnetwork, so that end-user can enjoy the videocontinuously without waiting and hard diskoccupying.
as c protoco : , ,
Contents
Digital TV Technology
Streaming Media Technology
IPTV Bearer Network Technology
Digital Right Management (DRM) Technology
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
14/18
IPTV Bearer Network Technology
Bandwidth
MPEG4: 1.2~1.5M per stream
. : per s ream
At least 2M per user
Channel switching delay
Multicast
IPTV Bearer Network Technology (Multicast)
Multicast network structure
ServerUser
Packet (sent once)
UserBroadcast TV vs VOD
Multicast vs Unicast
UserUser
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
15/18
IPTV Bearer Network Technology (Multicast)
Static Multicast VS Dynamic Multicast For static multicast, the multicast distribution tree (MDT) is
established statically. The multicast stream is transported along the.
For dynamic multicast, the MDT is established according to theIGMP request from users, based on the multicast routing protocol.
Static multicast has less delay than that of dynamic multicast. It issuitable for IPTV.
Multicast Management
Controllable management on multicast data received by users
Management of multicast source
IPTV Bearer Network Technology (Multicast) Multicast QoS
Multicast is based on UDP. Hence, there is no re-transport
mechanism for lost ackets.
The upgrading of the routers in the backbone network and MANincreases the Qos capability, which guarantees the QoS of the
multicast services.
To guarantee the QoS of multicast services, generally, the abroadcarriers separate IPTV services from normal PC Internet services.Thus, multicast QoS is guaranteed by establishing a dedicated
channel for multicast stream.
Multicast duplication point
To save bandwidth, the duplication point should be placed near to
the end users. For ADSL, the duplication point can be placed atBAS or DSLAM.
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
16/18
Sub-conclusion
Basic requirement for IP bearer network is:
Enough bandwidth
Supporting multicast
Better QoS guarantee
Contents
Digital TV Technology
Streaming Media Technology
IPTV Bearer Network Technology
Digital Right Management (DRM) Technology
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
17/18
DRM Technology
DRM technologies control use of digital media by preventing access, copyingor conversion to other formats by unauthorized end users. Firstly, DRM
encrypts video contents, then releases the contents through IPTV platform to
. ,system and then decrypt and decode the program.
DRM technologies involve standards of authorized language, encryption,encryption key management and architecture, etc. So far, there is no unified
standards suitable for operators. And the application of DRM must be
approved by the content providers.
The Principle of DRM
MediaServer
CopyrightServer
Web Server
Streaming
media
User
7/31/2019 2 IPTV BC en IPTV Related Technologies 1 PPT 201008(Draft) 36p
18/18
DRM Technology
DRM is designed to suppress piracy to some extent. However, due to thefact that there is no effective cooperative mechanism between broadbandoperators and media content providers, there is no progress on the piracyproblem.
Under the broadband network environment, it is not suitable to keep theregulations of traditional copyright management by DRM technology.Actually, it attempts to realize a charge mode of traditional video servicethrough the approach of electronic commerce.
To absolutely solve the copyright problem, it is required to research a newcooperation method to realize a win-win situation under new commerceenvironment.