Video over IP

Video Conference over IP

Videoconferencing (VC) is a combination of full duplex audio and video transmissions which allows people in two different locations to see and hear each other as if participating in a face-to-face conversation. A camera is utilized at both end points to capture and send the video signals. Microphones are used at each endpoint to capture and transmit speech which is then played through speakers. The communications are real-time and generally not stored.


Video over IP

Telecom operators have long toyed with the idea of running video over their present infrastructures, but now there's a couple of reasons why it might start happening on a large scale.

First, incumbent telcos are in a financial jam. They've got millions of tons of copper local loops in the ground and they're desperate to generate new revenues from it, to compensate for declining voice revenues.

Still, the video market isn't exactly empty – think cable, satellite, and the local video store – and telco networks certainly weren't designed for video distribution.


Encoding of Video

A Video Codec ( Encoder )  transports video and audio signals from cameras ,  VCRs and audio over a data network to other Video Codecs or computers somewhere else on the network. In a typical Networked TV application, the VCR or TV Tuner selects video and audio from Cable TV or the airwaves or it can get video and audio from a VCR tape or DVD. The video and audio is connected to the Video Codec  where they are digitised (converted to data) and compressed (duplicate or trivial data is removed). The encoded data is created in a standard format known as MPEG , MJPEG  that allows interoperability between devices from multiple vendors. Because the video is not just a single picture but a continuous series of snapshots of the world the camera is pointed to, the data from the Encoder is continuous. This continuous video data, known as a video stream, is taken from the Encoder by a program running on the Video Codec and sent out a network interface to the network.



MPEG-4   is an ISO/IEC standard developed by MPEG (Moving Picture Experts Group). The first version of the MPEG-4 standard was finalized in 1998 and became an international standard at the beginning of 1999. Although defined as one standard, MPEG-4 is actually a set of  compression /decompression formats and streaming technologies that address the need for distributing rich interactive media over narrow and broadband networks. One of these efforts has led to a new MPEG-4 based video compression standard known as H.264. Finalization of the H.264 standard was approved by a joint team of experts from the ITU ((International Telecommunications Union) and the ISO (International Standards Organization).


Video Monitoring

The goal of the video monitoring system also affects the type of system installed. In vulnerable public places such as train stations or bus stops, video cameras are combined with other emergency communications systems like hot phones or duress alarms.  The capacity of coax cables is limited and so the signal that is transported is limited. When the analog video signal is received at the control centre it was stored on magnetic tape, an unfriendly medium that does not allow for easy retrieval or search. 
The development of IP networks and digital video has changed dramatically. Video transmission over IP networks can greatly enhance video monitoring systems, which are fundamentally systems that use video networking infrastructure.


Using high quality MPEG Video for Monitoring

There is an increasing demand that video monitoring solutions provide DVD  quality signals so that control centres can see exactly what is going on at any given location. The only digital video standard that meets these requirements is MPEG. MPEG is an international standard that compresses analog video signals without any perceived loss of quality. A monitoring system based on MPEG compression would consist of high quality analog cameras that feed signals into an MPEG encoding and streaming platform. The MPEG streaming platform interfaces with the IP network and transmits streams to a central control centre.


The Advantages of MPEG Video and IP Networks for Monitoring - Quality

Today, security and safety requirements demand excellent video quality of video. Monitors want to be able to see the most minute details in all weather conditions, day or night. MPEG, an international video compression standard using in broadcasting and DVD creation, can provide the top quality video required by today’s monitoring systems. Use of existing infrastructure Most organizations already have high-speed networks that can support video transmission and streaming. Most equipment interfaces with the network at the point of transmission and at the control centre.


How IP Video Monitoring Works

Once the video signal is captured and ready for transmission, it is fed into a streaming platform which wraps the signal in IP and transmits it over the network to the control centre.

All rights reserved to MYVA Pty Ltd.