Axis 242, Руководство пользователя

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AXIS 242S IV - Video streams
Notes:
•MPEG-4 is licensed technology. The AXIS 242S IV includes one license for the decoder required
for viewing in AMC. Installing additional unlicensed copies of this decoder is prohibited. To pur-
chase more decoder licenses, contact your Axis reseller.
•All clients viewing the MPEG-4 stream must use the same image settings.
MPEG-4 protocols and communication methods
To deliver live streaming video over IP networks, various combinations of transport
protocols and broadcast methods are employed.
• RTP (Real-Time Transport Protocol) is a protocol that allows programs to manage
the real-time transmission of multimedia data, via unicast or multicast.
• RTSP (Real-Time Streaming Protocol) serves as a control protocol, to negotiate
which transport protocol to use for the stream. RTSP is thus used by a viewing
client to start a unicast session, see below.
• UDP (User Datagram Protocol) is a communications protocol that offers limited
service for exchanging data in a network that 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 e.g. network congestion. This is suitable for live video, as there is
no point in re-transmitting old information that will not be displayed anyway.
• 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 their own stream. A benefit of unicasting is that if one stream fails,
it only affects one user.
• Multicast 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.
AXIS Media Control (AMC)
The recommended method of accessing live video (MPEG-4 and/or Motion JPEG) and
audio from the AXIS 242S IV is to use the AXIS Media Control (AMC) in Microsoft Internet
Explorer in Windows. This ActiveX component is automatically installed on first use, after
which it can be configured by opening the AMC Control Panel applet from the Windows
Control Panel. Alternatively, right-click the video image in Internet Explorer.