Ganz ZN-B1MTP, Руководство пользователя

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PixelPro Series
ZN-BxMTP Series
User’s Manual
10-2014-A
13
2.5 Video stream types
H.264 protocols and communication methods
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RTP ( R eal-time T ransport P rotocol) is a protocol that allows programs to manage the
real-time transmission of multimedia data, via unicast or multicast.
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RTSP ( R eal T ime S treaming P rotocol) serves as a control protocol, to negotiate the
type of transport protocol to use for the stream. RTSP is used by a viewing client to
start a unicast session.
•
UDP ( U ser D atagram P rotocol) is a communications protocol that offers limited
service for exchanging data in a network which uses the Internet Protocol (IP).
UDP is an alternative to the Transmission Control Protocol (TCP). The advantage of
UDP is that, it is not required to deliver all data and may drop network packets when
there is network congestion. This is suitable for live video, as there is no point in re-
transmitting old information that will not be displayed anyway.
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Unicasting is communication between a single sender and a single receiver over a
network. This means that the video stream goes independently to each user, and each
user gets own stream. A benefit of unicasting is, in case one stream fails, it only affects
one user.
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Multicasting (Will be supported) is bandwidth-conserving technology that reduces
bandwidth usage by simultaneously delivering a single stream of information to multiple
network recipients. This technology is used primarily on delimited networks (intranets),
as each user needs an uninterrupted data flow and should not rely on network routers.
2.6 How to stream H.264
Deciding on the combination of protocols and methods to use depends on your viewing
requirements, and on the properties of your network. Setting the preferred method(s) is
done in webpage.
RTP+RTSP
This method (actually RTP over UDP and RTSP over TCP) should be your first
consideration for live video, especially when it is important to always have an up-to-date
video stream, even if some images are lost due to network problems. This could be
configured as multicast or unicast.
RTP/RTSP/Multicasting (Will be supported) provides the most efficient usage of
bandwidth, especially when there are large numbers of clients viewing simultaneously.
Note however, that a multicast broadcast could not pass a network router unless the
router is configured to allow this. For example, It is impossible to multicast over the
Internet.