Sensoray 2480 User Manual

Page 6

2480 Instruction Manual

Installation and Configuration

• Frame size. One of three possible frame sizes must be

selected for each video input channel: 4CIF, 2CIF or 1CIF.
The resolution of each of these sizes is detailed in the
Specifications (see page 8).

3.6.2 JPEG Quality

The JPEG compression level can be set to values between 0
(lowest quality, smallest file size) and 100 (highest quality,
largest file size). These are relative levels; the actual
compression ratio will vary based on image complexity and
other factors.

3.6.3 Stream Protocol

Stream protocols are used to convey stream data across a
network. Three stream protocols are available on the 2480:

HTTP Streaming Video. This protocol enables a compatible
web browser to display video directly in its client window. Not
all browsers support this feature; some browsers have native
support, while others require plug-ins or, in some cases, do not
support this protocol. In general this is only recommended for
viewing one stream at a time.

RTP-JPEG. This protocol, in which the MJPEG stream is
encapsulated by RTP (Real-time Transfer Protocol) per RFC
2435, is compatible with Quicktime viewers.

RTP-TS. When this protocol is used, the compressed stream is
encapsulated by RTP and then multiplexed into a transport
stream.

Table 1: Comparison of stream protocols

3.6.4 Stream Control Protocol

Stream control protocols are used to establish and control
media sessions between endpoints, thus enabling clients to
issue commands to facilitate real-time control of streams.

A stream control protocol is automatically selected for each
video input channel, based on the streaming protocol used.
Two stream control protocols are supported by the 2480:

HTTP. Hypertext Transfer Protocol. This protocol enables
web-based stream control via a web browser, which interacts
with the 2480’s internal web server. It is used when streaming
via HTTP.

RTSP. Real-Time Streaming Protocol is used to control
streams delivered via RTP. RSTP is used by VLC and
Quicktime clients.

Stream
Protocol

Compatible
Viewers

HTTP

Various web browsers

RTP-JPEG

Quicktime, VLC

RTP-TS

VLC