Video streaming In India - PowerPoint PPT Presentation

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Video streaming In India

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Title: Video streaming In India


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Video streaming In India
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  • Streaming media is media that is consumed (read,
    heard, viewed) while it is being delivered.
    Streaming is more a property of the delivery
    system than the media itself. The distinction is
    usually applied to media that are distributed
    over computer networks most other delivery
    systems are either inherently streaming (radio,
    television) or inherently non-streaming (books,
    video cassettes, audio CDs).

3
  • The word 'stream' is also used as a verb,
    meaning to deliver streaming media. The
    difference between Video Conferencing and Video
    streaming in simple terms is that Video
    conferencing is a two way and multiway
    collaboration of audio, video and data, whereas
    streaming is a one way delivery of audio, video
    and data. Ofcourse the return path can be a data
    chat mode in a streaming application.
  • The big challenge in Video conferencing
    application is the high bandwidth requirement at
    the central Multi Conference Server which will be
    twice the number of users connected multiplied by
    the bandwidth at which the conference is taking
    place and hence the reachability is limited based
    on the available bandwidth on the unicast mode.
    In Streaming, over a multicast network, only the
    bandwidth at which the stream is captured is used
    irrespective of the number of users who receive
    the stream. Over the unicast mode, the bandwidth
    required would be equal to the number of users
    multiplied by the bandwidth at which the stream
    is being captured.

4
  • Protocol Issue
  • Designing a network protocol to support streaming
    media raises many issues. Datagram protocols,
    such as the User Datagram Protocol (UDP), send
    the media stream as a series of small packets.
    This is simple and efficient however, packets
    are liable to be lost or corrupted in transit.
    Depending on the protocol and the extent of the
    loss, the client may be able to recover the data
    with error correction techniques, may interpolate
    over the missing data, or may suffer a dropout.

5
  • The Real Time Streaming Protocol (RTSP),
    Real-time Transport Protocol (RTP) and the
    Real-time Transport Control Protocol (RTCP) were
    specifically designed to stream media over
    networks. The latter two are built on top of UDP.
  • Reliable protocols, such as the Transmission
    Control Protocol (TCP), guarantee correct
    delivery of each bit in the media stream.
    However, they accomplish this with a system of
    timeouts and retries, which makes them more
    complex to implement. It also means that when
    there is data loss on the network, the media
    stream stalls while the protocol handlers detect
    the loss and retransmit the missing data. Clients
    can minimize the effect of this by buffering data
    for display.

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  • Hence when designing a streaming application,
    knowledge of Networks design, Quality of video
    streaming service over IP network, and the
    multimedia capturing tools audio, video, data
    are essential to deliver a smooth media stream.

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