Streaming Server

8/7/2019 Streaming Server

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Our sincere thanks to HOD Prof. O.P. Verma, IT Department

for bestowing upon us this learning oppurtunity. It was a greatworking experience with constant monitoring and support from

our mentor Mr. Rahul Katariya. We believe this project will

help us in long careers ahead in life.


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To develop a framework for deploying real time unbuffered streaming ofmultimedia over a network using Darwin Streaming Server.

Key focus is also on various security issues relating to sharing of multimedia files. To implement an On-Demand Media Streaming Server using latest techniques on

the Darwin Programming Interface employing the features:

Reduced latency Scalability

To do the performance analysis of server/client. To protect the media from unauthorized production of videos.

Deployment Areas: distance learning courses. Video Lectures and seminar delivery corporate communications to employees, customers, suppliers, or shareholders. one-time concert or presentation .


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What is Streaming?

Displaying media from a server over a network to a client in real time, from modemrates to broadband.

No file is ever downloaded to a viewers hard drive. Media is played by the client software as it is delivered.

request

response

With Streaming you can deliver* broadcasts of live events in real time.

* video on demand.* playlist broadcasts of pre recorded content.

The streaming server transmits video and audio streams uses client software such as QuickTime Player. Handles request using Real-Time Streaming Protocol (RTSP).

CLIENT SERVER


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Examples streaming video, IP telephony, teleconferencing, interactive games.

Service requirements:

Highly sensitive to end-to-end delay

Jitter sensitive Loss tolerant

Audio/Video streaming : popular application and significant consumer of network

bandwidth.

Key Factors: Improvement in Internet infrastructure: cable modem, caching and content

delivery networks (CDNs).

Enormous pent-up demand for live videos or on demand streaming.

Streaming of highly secured videos which may not allow duplication.


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Key Features:

Stored Media: prerecorded and stored at server, user may pause, rewind or

fast-forward.

Streaming: begins playout while receiving no entire file download.

Continuous playout: progress according to original timing of recording.

Limitations:

Packet Loss

End-to-end delay

Packet jitter Delayed playback (Buffered first)


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Flash Media Server is used most commonly. It uses RTMP. It supports Buffered Video streaming.

Technology: Embed the shockwave file(.swf) in your web page. All you need is Flash plugin to run the media at client side.

Used by YouTube, Adobe, Live sports telecast etc.

Advantages: Helps in multiple viewing of same media. Supports caching. Easy to integrate. Supported by all web browsers. Flexible over all kinds of networks, since the media is first downloaded and then

displayed.

Disadvantages: Flash media is costly to deliver. High compression cost involved. Client can reproduce its own copies of media and sell or forge with it. Frustrating since you have to wait for the media while buffering.


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Studied the architecture of the DSS and figured out how we can use itsProgramming Interface to implement Patching.

Patching Module: Requirements

RAM Required: greater than 512 MB

Platform : Linux/Windows Server2003

Streaming Technique : Patching

Programming Interface : Darwin Streaming Server

Front End: XML

BackEnd Language : C++

Specifications

High speed LAN (depending upon no: of users)

Media Player- VLC, Quick Time, Real etc.


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Streaming

Buffered Unbuffered

Progressive download(Buffered Streamingeg You-Tube) that allows the user to startviewing the movie once a sufficient amount of video data has been received or

buffered, and then while the movie plays, the rest of the data is downloaded.

Issues with Buffered Media: large portions of hard disk space or recordable CDs to store it is required. pirate copies can be developed or file sharing applications can be used to make the

film illegally available to others.

Advantages of Darwin Server: movie data is not stored locally. data is only kept in the computer memory for processing and once content has been

displayed it is discarded. movie data streamed is synchronised.


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downloaddela s are re oved, arddis s ace to store ovie data is not re ired.

t e strea can e ter inated anyti e.

erver sends data till it is strea ed. Efficient where networ char e is on sa e.

ower alityvideo can e strea ed for low andwidth connection.

o iracyof enuine copy andhelps in authorizedviewing.

upports othunicast and ulticast upports followingprotocols:

over

over

Hur les:

irregular trans issiondelays i.e. jitter, and loss ofpackets from the streamcan resultin impairedvideo uality at the client.

huge networkingconstraints are to e kept inmind.

deployed according to the topological distri utionofcomputer terminals.

ocachingofmedia.


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Darwin Streaming Server

Unbuffered

Windows, Linux,

MacOs, Solaris

QTSS, MP4, AVI, WMV

RTSP, RTP, RTCP

Any Player- VLC,QTP,Real time player etc.

Flash Media Server

Progressive/Buffered

Windows, Linux

FLV, MP4

RTMP

Flash Player

Services

Streaming

Operating System

Support

Format support

Protocol Support

Player Support


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Using a CAT-5 cable(100 Mbps LAN)

An average Video delivered at 1000kbps (approx.) over 100Mbps connection for the

Local LAN would suffice the requirement for

100Mbps/1000kbps= 100 clients

but experimental results have shown loss due to high jitter decreasing clients over

the network.

Using a CAT-6 cable(1 Gbps LAN)

The LAN is used rarely but could support even higher no of clients.

The Wi-Fi Network working over 56Kbps does not perform well, due to very high

jitter in the network. Thus failed to deliver stream.

Further use of CAT-7 cable would increase the bandwidth consumption to 10Gbps.


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Sample effects ofvideo streaming errors. he images show a video se uence

unimpaired (left), with loss (middle) andwithpacket reordering.


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When the packet is delivered after its streaming time there is a loss of packet. Buffered

media maintains a lag from streaming server so as to avoid jitter.


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A stream delivered at 1000kbps. Jitter is better in

Multicast Network than in Unicast.


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ATM could be used to deliver media.

ATM is a cell based switching technique it is very much suitable for Real Time

Media Transport.

Can be deployed over LAN as well as WAN.

ATM uses SONET backbone of ISDN.

SONET transfers multiple digital bit streams over optical fibre so high end speed

could be obtained.

We can use Darwins security features and ATMs high speed switching technology

to cope with the ever increasing demands.

Drawbacks:

Technology has been limited.

Very costly as of present scenario.

No Hardware and Software compatibility.


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Anirban Mahanti, Derek Eager, Mary Vernon, and David Sundaram-Stukel,"Scalable On-demand Media StreamingwithPacket Loss Recovery", IEEE/ACMTransactions on Networking, Vol. 11, No. 2,April 2003,pp. 195-209.

K.A. Hua, Y. Cai, and S. Sheu, Patching:A Multicast Technique forTrue Video-On-Demand Services,Proc.ACM Multimedia 98, Bristol, U.K., Sept. 1998.

D. L. Eager, M. K. Vernon, and J. Zahorjan, Bandwidth Skimming:A Technique forCost-Effective Vide o-on-Demand,Proc. MMCN 00, San Jose, CA, Jan. 2000.

ComputerNetworking,A Top-DownApproach Featuringthe Internet, James F.Kurose; Keith W. Ross

Quick Time StreamingServer:Administrators Guide QuickTime StreamingServerModulesProgrammingGuide http://developer.apple.com/opensource/server/streaming/index.html http://wiki.gandi.net/en/hosting/usinglinux/tutorials/fedora/darwinstreaming http://lists.apple.com/mailman/listinfo/streaming-server-dev.

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Streaming Server