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Introduction
6
VGA Broadcaster Lite User Guide
Streaming over HTTP. The VGA Broadcaster Lite transfers data to the viewer
via HTTP protocol. You can play such stream directly in the browser using
appropriate plug-ins. Streaming over HTTP sends duplicates of all data to
each connected client. Due to this duplication, the number of supported
clients is typically limited to three viewers. If you would like to support more
than three, Epiphan provides larger systems that can scale to more users, or
you can consider using RTSP, Multicast or CDN network architectures for
your applications.
RTSP streaming. RTSP is similar to Streaming over HTTP (see above).
However, the viewer can choose between TCP (which is very similar to
HTTP) and UDP protocols using its software. UDP protocol can reduce the
latency (the delay between the moment an image appears on the VGA/DVI
input and the moment remote clients see it) in streaming. However, UDP
requires better router/firewall cooperation at the location where VGA
Broadcaster Lite is installed.
RTP streaming. RTP streaming is performed using the UDP protocol.
However, unlike previous streaming methods, it does not require a request
from the viewer to start sending data. The multimedia stream is
always
sent
to the specified destination IP address. If the destination IP address is a
workstation’s address, then only specified workstation receives the stream
and this is Unicast RTP. If the specified address is a multicast/broadcast
address, an unlimited number of workstations on a LAN can access and view
the stream as a Multicast RTP stream. The advantage is that only one copy
of the data is sent from VGA Broadcaster Lite. Generally, due to the nature of
the Internet, a Multicast RTP stream is not usually propagated outside the
LAN (though it may be propagated trough VPNs connecting several LANs).
Content Delivery Networks. VGA Broadcaster Lite can be set up to send a
stream (using any method mentioned above except Multicast RTP) to a
special destination type of client, called Content Delivery Network (CDN).
CDN is a network service that redistributes the stream for multiple viewers.
An architecture that serves viewers through the CDN significantly increases
Содержание VGA Broadcaster Lite
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Страница 75: ...Viewing the Broadcast 71 VGA Broadcaster Lite User Guide Figure 23 Broadcaster Lite Remote Viewing ...
Страница 94: ...Sample Applications 90 VGA Broadcaster Lite User Guide ...
Страница 99: ...List of Figures 95 VGA Broadcaster Lite User Guide ...