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AXIS 223M - Video Streams

Video Streams

The AXIS 223M provides several different image and video formats. The type to use

depends on your requirements and on the properties of your network.

The Live View page in the AXIS 223M provides access to

Motion JPEG and MPEG-4 video

streams, as well as 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 JP

EG still images in the video 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 uses

considerable amounts of bandwidth, but also provides

excellent image quality and access to every individual image contained in the stream.

Note also that multiple clients a

ccessing Motion JPEG streams can use different image

settings.

MPEG-4

This is a video compression standard that makes go

od 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 the AXIS 223M 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, as used by e.g. QuickTime™.

• Ad

vanced Simple - sets the coding type to MPEG-4 Part 2, as used by AMC (AXIS

Media Control)

When using MPEG-4 it is also possible to control the bit rate, which in turn allows the

amount

of bandwidth usage to be controlled. 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. The AXIS 223M includes one viewing client license. Installing

additional unlicensed copies of the viewing client is prohibited. To purchase additional licenses,

contact your Axis reseller.

•All clients viewing the MPEG-4 stream must use the same set of coding tools.

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