Video Streams; Stream Types - Axis 233D User Manual

Video Streams

The AXIS 233D provides several different video stream formats. The type you choose to
use depends on your requirements and on the properties of your network.
The Live View page in the AXIS 233D 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.

Stream Types

Motion JPEG
This format uses standard JPEG still images in the video stream. These images are then
displayed and updated at a rate sufficient to create a stream that shows continuous motion.
The Motion JPEG stream uses more bandwidth, but also provides excellent image quality
and access to every individual image contained in the stream.
Note also 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, can provide high
quality video streams at less than 1Mbit/s.
Notes:
• MPEG-4 is a licensed technology. The AXIS 233D includes one viewing client license. Installing addi-
tional 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 image settings.
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 233D 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 QuickTime™, for example.
• Advanced 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 helps control
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.
AXIS 233D - Video Streams
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