Axis Communications Security Camera 241Q User Manual

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AXIS 241Q/241S - Video streams
Video streams
The AXIS 241Q/241S provides several video stream formats. The type you want to use
depends on your requirements and the properties of your network.
The Live View page in AXIS 241Q/241S provides access
to Motion JPEG and MPEG-4
video streams, and to single JPEG images. Other applications and clients can also access
these video streams/images directly, without going via the Live View page.
Video stream types
Motion JPEG
This format uses standard JPEG still images in the vi
deo stream. These images are then
displayed and updated at a rate sufficient to create a stream that shows constantly updated
motion.
The Motion JPEG stream provides excellent image
quality and access to every individual
image contained in the stream.
Note that multiple clients accessing Motion JPEG
streams can use different image settings.
MPEG-4
This is a video compression standard that makes good
use of bandwidth, and which can
provide high-quality video streams at less than 1 Mbit/s.
The MPEG-4 standard provides scope for a large
range of different coding tools for use by
various applications in different situations, and AXIS 241Q/241S provides certain subsets
of these tools. These are represented as Video object types, which are selected for use with
different viewing clients. The supported video object types are:
• Simple - sets the
coding type to H.263
• Ad
vanced Simple - in Axis products, this sets the coding type to MPEG-4 Part 2
AMC (AXIS Media Control) supports both object types, while
QuickTime™, for example,
requires the Simple object type.
When using MPEG-4 it is also possible to control th
e bit rate, which in turn allows control
of bandwidth usage. CBR (constant bit rate) is used to achieve a specific bit rate by varying
the quality of the MPEG-4 stream. When using VBR (variable bit rate), the quality of the
video stream is kept as constant as possible, at the cost of a varying bit rate.
Notes:
• MPEG-4 is licensed technology. AXIS 241Q/241S includes one license for the decoder
required for viewing in AMC. Installing additional unlicensed copies of this decoder is
prohibited. To purchase more decoder licenses, contact your Axis reseller.
• All clients viewing the MPEG-4 stream must use the same image settings.

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