Video Streaming 4ppt3456

8/6/2019 Video Streaming 4ppt3456

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Internet Video Streaming

Chaitali Kasar (ME10F13F009)


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Video Streaming

Video Streaming Objective

Streaming Advantages

Video Streaming Architecture

Compression and Decompression-codec

MPEG 1-4 Introduction

Major Products and Features Comparison


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Video Streaming Objective

The object is to overcome the negative effectsof physical distance and network technologylimitation.


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Data on the internet

Downloading

Streaming


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Streaming Advantages

Reduce setup time

Reduction in client storage requirement

Video can be viewed in real time

Transmission signals over low bandwidth

facilities


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Video Streaming Architecture

Content Creation/Capture

Content Management

Content Formatting (Compression)

Delivery

Distribution

Presentation (Viewing)

View Control


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Video Capture

Converting analog to video signals

A special video capture card to convert theanalog signals to digital form andcompresses the data.

Also digital video devices that can captureimages and transfer to a computer


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Content Management

Critical in video server

The purpose including create, collect, catalog,organize, store, and access to massivemultimedia information database


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Video Input Formats

AVI

ActiveMovie

Cinepak

Indeo

motion-JPEG

MPEG

QuickTime

RealVideo

Video for Windows

XGA


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Video Formats

AVI & ASF

Developed by Microsoft

AVI (Audio Video Interleaved)

- limited to 320x240 resolution- 30 frames per second

ASF (Advanced Streaming Format)

- Has been submitted to ISO forstandardization

- Expected to replace AVI format


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Standard Window Size

320X240

640X480


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Frame Rates

4-6 fps

Absolute minimum for video conferencing

11-14 fps

The norm for video conferencing

30 fps

Full motion video


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Codec

(Compressor/D

ecompressor)

Coding techniques to compress video data

The newest codec change their sampling rateas they run

Choice of codec is the biggest factor todetermine the bandwidth needed to connect

the server and receive content Many of the codecs follow international

standards


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Content Compression

MPEG (A working group of ISO)

- The most common standard for video

compression and file formats- Generally produce better quality video thanother formats

- High compression rate

- MPEG1, MPEG2, MPEG3 and MPEG4


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VIDEO COMPRESSION STANDARDS


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MPEG-4

An MPEG-4 standard is in the final stages ofdevelopment and release.

It is a much more ambitious standard andaddresses speech and video synthesis, fractalgeometry, computer visualization, and an

artificial intelligence (AI) approach toreconstructing images.


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Video Streaming Standards

H.261 H.263

MPEG1

MPEG2 MPEG4


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H.261

H.261 is use for teleconferencingapplications and is intended forcarrying video over ISDN.

H.261 needs substantially less CPUpower for real-time encoding than

MPEG. H.261 uses constant-bit-rate encoding.


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H.263

H.263 is design for low bitratecommunication.

H.263 expected to be use for wide rangeof bitrate and expected to replace H.261.

H.263 supports 5 resolutions, able tocompete with MPEG standards.


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TCPTransmission Control

Protocol Protocol used for reliable document

transfer

HTTP (Hypertext Transfer Protocol)uses TCP as the protocol for reliabledocument transfer.

Unsuitable for video and audio

because: Imposes flow control Unnecessary Message delivery


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UD

PU

serD

atagram Protocol

UDP is the alternative to TCP.

UDP forsakes TCP's error correctionand allows packets to drop out if they'relate or damaged.

Access Problems (firewalls).


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Some Real-Time Transmission

Related Protocols

RTP

VDP RTSP

RSVP


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Real time softwareAdobe flash media server


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Adobe Flash Media Server

Adobe Flash Media Server (FMS) is a real-time media

server that can deliver video on demand, live video,

streaming music, video blogging, video messaging,multimedia chat environments, real-time datacasting, and

multiuser gaming

it provides powerful new delivery methods that can save

significant bandwidth costs and lighten network load.

Allow us to create completely customized interfaces. Real-

time data sharing, server-side plug-ins, logging, and

monitoring APIs


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Flash Media Server 4 Peer-assisted networking

Multicast fusion

HTTP Dynamic Streaming with live packaging

64-bit architecture

Absolute time code

Access plug-in support in Flash Media Streaming Server


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Real Time Message Protocol

RTMP is a reliable TCP/IP protocol for streaming and data

services.

RTMP Adobes proprietary method of communication between

Flash Player clients and Flash Media Server.

RTMP is a unicast delivery method. It simply delivers streams

from a server to individual connected clients.

TCP is lossless; each data packet is guaranteed to arrive in the

same order it was sent. RTMP is not encrypted by default, but it

can be encrypted using RTMPE.

Flash Media Server supports the following types of RTMP

connections: RTMP, RTMPT, RTMPS , RTMPE , RTMPTE


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T

hank you

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Video Streaming 4ppt3456