7 IPTV-BC-En-Technical Principles and Applications of Stream Media-1-PPT-201009(Draft) 25p

7/31/2019 7 IPTV-BC-En-Technical Principles and Applications of Stream Media-1-PPT-201009(Draft) 25p

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Technical Princi les and A licationsof Stream Media

Contents

Introduction to Streaming Technology

ZTE Streaming Media Technology


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Streaming Technology

Streaming Media refer to continuous audio/video data streamsthat are transmitted and played over the data network in thetime sequence.

ream ng me a a a as e o ow ng ree ea ures:

Continuous

Real-time

Time sequencing, that is, the streaming data has a strict time

sequence.

After the digital video stream is encoded and compressed, it canbe transmitted and controlled through different network

transmission protocols. Two common protocols are Real-timeTransport Protocol (RTP) and Real-time Streaming Protocol

(RTSP). Technical specifications released by the InternetStreaming Media Alliance (ISMA) define data transport and control

plans. In addition, Transport Stream (TS) is also a relevantspecification.

Major Standards Involved in Streaming Media

Technology ISMA(Internet Streaming Media Alliance )

MPEG-2, TS and other streaming transport protocols

, , ,

MPEG series, H264 and other H series standards,AVS and other encoding/decoding protocols

Streaming media network http://iptv.lmtw.com/


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ISMA-Internet Streaming Media Alliance

On December 12, 2000, Cisco Systems and SunMicrosyscoms founded the ISMA, which aims at

.ISMA facilitated the introductoin of open technologies forthe transport and unified management of streaming media.

The website of ISMA ishttp://www.ISM-Alliance.org

RTSP(The Real-Time Streaming Protocol )

The RTSP is proposed together by RealNetworks and Netscape. It

Streaming Media TechnologiesRTSP and

RTP

over the IP network in one-to-many communications. The RTSPtransports the contents in the unicast streaming method. It is anapplication level protocol, specially created to control real-time data.

RTP(Realtime Transport Protocol )

RTP is a protocol for multimedia streaming over the Internet. The

RTP is defined to work in conditions of one-to-one or one-to-many

,synchronization. The RTP usually uses the UDP to transport data,but it can also work over TCP, ATM and other protocols. The RTPcan only ensure real-time data transport.


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Streaming Media TechnologyRTCP

Realtime Transport Control Protocol

The RTCP manages transport quality by exchanging control informationbetween current application processes.

The RTCP has four ma or functions:

1. The client feeds back video data transport quality in real time, according towhich the server performs traffic control, network monitoring and faultdiagnosis;

2. It provides a permanent Canonical Name (CNAME) for the RTP source. Incase of conflicts or program update and restart, the Synchronization SourceIdentifier (SSRC) will change, which requires an operation trace; In a group ofrelevant sessions, the receiving parties will also need the CNAME to obtainrelevant audio and video streams from a designated participant;

3. It adjusts the transmitting rate of RTP packets according to the number ofparticipants;

4. It transmits session control information, for example, the user interface candisplay participant identifiers, which is an optional function.

Streaming Media Technology

SDP The Session Description Protocol (SDP) provides

multimedia session descriptions for session notification,

session initialization.

SDP text information includes:1. Session name and intention;

2. Session duration;

3. Media that constitute the session;

4. Information on media recei t address and other information

SDP information is text information that uses ISO10646 character set in UTF-8 code.


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Contents



Streaming Media Server Work Modes In the IPTV system, the streaming technology is used

to transport media data from the server to the client. Inthis process, media data is replicated to the edge

network, and then transported to the STB through thestreaming technology.

The streaming transport includes sessionestablishment, data packaging format, data packettransmission format, and user pause/fast forward/fastbackward request processing.

Currently, among all IPTV solutions, two systems adoptthe streaming transport mechanism, ISMA and TS overIP. The ISMA system provides flexible support for thefuture value-added services due to the bi-directionalinteraction of the IP network.


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Streaming Media Server Work ModeISMALive Broadcast

Streaming Media Server Work ModTS Live

Broadcast


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Streaming Media Server Work ModeTCP/UDP for STB If the STB connection adopts the TCP method, the data source of the STB

is the streaming server, and a URL starting with "rtspt://" is used to specify

TCP as the data transport protocol when the STB is creating RTSP links

. ,and borne by the TCP, and then transported to the STB from the streaming

server. Since the bearer protocol of RTSP is also TCP, data transport andRTSP share the same TCP channel (554 port). The TCP-mode STB service

is applicable to broadcast (unicast), TSTV, TVOD and NPVR.

The UDP mode of STB service includes two conditions, as shown in thefigure below. The STB can join a multicast group to receive multicast data

streams, with the live broadcast coder or streaming server as the multicast.

method, the URL starting with "rtsp://" ,it is used to specify UDP as the datatransport protocol , the STB is creating RTSP links with the streaming

server. The TCP-mode STB service is applicable to live broadcast(multicast) and xVOD.

Streaming Media Server Work ModeLive

Broadcast FlowClient Streaming Media Server

DESCRIBE Determines whether time-shifting is

feasi e accor ing to t e SDP. If yes,

obtain the time-shifting range of the

program.RTSP 200 OK SDP

SETUP

RTSP 200 OK

RTSP 200 OK

PLAY


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Contents



ZTE Streaming Media TechnologySystem

Architecture

Resource ReportCharging AuthenticationContent Module

Communication Module

Channel

Service Management Platform

o u e

RTSP Processing

o u e

Deletion Module

Log Module

Live BroadcastRelay Module

Stream

Splicing

StreamProcessing

Layer

Protocol Layer

Application Layer

VOD Relay Module

ConfigurationModule

File

Module

Module

Client

File Storage Module

Accessing of Spliced Files Lib

RTSP Message Internal MessageRTP/RTCP Media Stream

Server System ExternalMessage

Storage

Device

Format Conversion

Module


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ZTE Streaming Media TechnologyProcesses

Streaming Service Process.

Channel Live Broadcasting Process

on en erv ce rocess

Multipath Process

Communication Service Process

Network Management Service Process

In addition to the processes above, it also contains a

,

await information, and df information.

ZTE Streaming Media TechnologyPrecise

Control


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ZTE Streaming Media TechnologyUnicastService

ZTE Streaming Media TechnologyMulticast

Service


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ZTE Streaming Media TechnologyIntra-Node Shared Multicast Service

ZTE Streaming Media TechnologyWhole Network Multicast

Service


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ZTE Streaming Media TechnologyQoS

Stable code streams.

Redundant live broadcast of the channels.

e commun ca on mo u e, mu pa mo u e, con enmodule and network management module can be runindependently. Messages are exchanged between themodules in real time.

Port multiplexing and detection. Black fake source codestreams are discarded.

Disk array segregation. Ensures that time-shifted userscan still receive live broadcast code streams when the diskarray is offline.

Fast delivery, supporting channel quick delivery and VODquick delivery.


Features IPTV, mobile streaming media/mobile monitoring, VSS

monitoring are integrated into one module, which satisfies,

network terminal users and enterprise and family users.

Strict QoS requirements help to build a top-grade carrier-class product.

Flexible networking satisfies the demand of differentcarriers and bandwidths.

ex e s orage mo es, nc u ng oca an ne worstorage, implements flexible scheduling of value-addedservices.

Supports High Definition technology.


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7 IPTV-BC-En-Technical Principles and Applications of Stream Media-1-PPT-201009(Draft) 25p