Video Conferencing – Introduction

March 3, 2018 | By 246@dmin | Filed in: Uncategorized.

Through videoconferencing, people can interact, as if they were talking with real-time images and sounds. This article is intended to provide you with the most appropriate system type among the different options.

There are different types of video conferencing; which corresponds to your application depends on the availability of the IT structure and what it wants to achieve.

Video conferencing was relatively expensive in the past but prices have decreased and anyone with fast internet connection to operate video conferencing

Systems can be rented, leased or sold [19659002] Systems can be installed in either or any of the following: – [19659004] on your desktop computer

  • is a dedicated videoconferencing package
  • mobile – for use where and when needed.
  • Each has different advantages and limitations that can be critical to the goal.

    Paradoxically, it is far more critical to keep audio connections than the video. You may lose a video signal or it may be interrupted from time to time, but the conference will continue – if you lose the sound, nothing can be achieved (unless both signs are signal sign)

    Video speed is often seen as frames per second FPS

    Most video source in the United Kingdom runs under PAL, which is 25 frames per second – e.g. home VHS players. In the United States, NTSC is running 30 frames per second. Videoconferencing devices typically provide 15fps or 30fps. According to the layman's terms – 15 frames per second shorter, showing all other frames, 30 frames per second video full-motion video.

    The larger the frame, the higher the data capacity, the faster the connection

    the total motion between the two points is 768 kbit / s.

    This consists of: – 384 Kbps (typically used) encoding rate is selected. This is divided into two parts:

    • 64Kbps for audio
    • 320 kbit / s to video.

    The resulting 384 Kb / s compression is compressed and sent (from you – the source) to the remote point (to the destination). Likewise, a 384 Kb / s stream is also received from the remote point. This requires twice the 384 Kbps bandwidth.

    If there is a lot of movement in the video, very little compression can be achieved. If there is little or no movement in your video, your savings can reach 50%. In any case, it would be foolish to design a system that would force the participants to remain static.

    There are two types of videoconferencing, each of which has subgroups.

    1. Point to point – live video / audio communication between any two locations.
    2. Multipoint connections between three or more locations

    Point-to-Point (P2P)

    Point-to-Point – live video and audiovisual connection between any two locations

    P2P – 19659002] you only need to communicate at one time: –

    • Two offices
    • You and a business partner, e.g. You and your big carrier
    • Two departments' management / team – eg. research and production.

    P2P usage

    • Virtual meetings on a single basis
    • The project team is working to coordinate efforts, live settings for data, drawings, documents, or prototypes
    • Virtual forum meeting between two groups of people in certain places – say 5 in one and four others

    P2P – Limits

    • Bandwidth increases the amount of data exchanged.
    • An audit trail to track those actions that are often required by the time band sequence.
    • Considering two video conferencing terminals (vcts) that are connected to the Internet [19659002] The vct and its associated video conferencing (vct) are connected to the Internet [19659002] Specific equipment is required for displaying physical objects using a wardrobe for speech detector parts [peripheralsallowtheusertomakeacalltoanotherclientsendthelocalaudio/videostreamtotheremoteclientandhear/viewthereceivedaudio/videostreamwithalocalloudspeaker/monitorthatisvct

      Suppose a user (local user) uses a vct to call a remote vct user by entering the IP address of the remote vct. Customers compile stations between the stations after the requirements of protocol H.323. Once the call is set up, customers will re-exchange audio / video streams over the internet. Point-to-point video conferencing continues until one user "suspends" the call

      . some users have dynamically allocated (DHCP) IP numbers that can change their systems each time and cause problems with IP addressing when different transport systems are used.

      The Gatekeeper

      Mitigating the problem of H.323 defines the use of the gatekeeper

      The gatekeeper is a system that connects to the internet as well as client terminals. The gatekeeper's IP address is set to client terminals, and when customers turn on, they communicate with the gatekeeper and pass certain information to the gatekeeper describing the vctet.

      When clients sign up with the gatekeeper, they pass their IP number, H.323 alias, and H.323 extension to the container. This allows the local user to dial a remote user through the remote user's H.323 extension to the video's phone number.

      Local vct communicates the H.323 extension with the gatekeeper. The gatekeeper then checks whether the remote client is registered at the gate and then sets the call between the two clients.

      Once the call is set up, the audio / video stream streams directly to clients via the Internet.


      Live video and audio links between three or more locations.

      For handling the situation, H.323 introduces the concept of Multipoint Control Unit (MCU). The MCU can be considered a "video bridge". The MCU connects to the Internet and registers the gate.

      An MCU can handle a number of simultaneous video conferencing, depending on its design capacity, each video conferencing being logically distinct from each other and each having a certain number of

      If users want to connect to a particular video conference session, they will dial the service number / password combination . The gatekeeper will check whether the service is registered by an MCU. The gatekeeper has completed the call by connecting the customer to the specific video conferencing of the MCU

      When the call is switched on, the client's audio / video stream is transferred from the client to the MCU via the Internet. Likewise, other customers join the session and send their audio / video streams to the MCU. The MCU selects one audio / video stream on the video conferencing system and returns the audio / video stream to all the clients (that is, except for the client whose stream has been selected).

      There are many methods available for an audio / video stream. Audio switching and presidential control are two alternatives. In general, the method chosen is the voice change, where the MCU selects the currently active sound (someone talking or talking loudest).

      As the user (s) on one page terminates the conversation and the user (s) starts talking on another page, they capture the MCU. The process will be repeated with the video from the newly selected site, which will now be sent to other sites. To participate in the H.323 videoconferencing, users must have appropriate video conferencing client terminals and have enough bandwidth internet connection to support videoconferencing

      Some users do not have these capabilities but are still they would like to participate, even if it meant that only the participants were seen and heard but could not interact with them. (Watch and Listen)

      Users can receive data streams from a computer browser. Enter the URL of the server and the server will start encrypted audio / video stream over the Internet to the computer.

      There are extensions in the browser that are capable of decoding both RealVideo and Windows media streams. The user can see and hear the participants of the video conferencing in near real time.

      Alternatively, the user can connect to the server last time and view the archived version of the videoconferencing.

      Source by SBOBET

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