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AXIS 247S - Video and Audio Streams
7
Video and Audio Streams
The Video Server provides several different video and audio stream formats. The type to use depends on your
requirements and on the properties of your network.
The Live View page in the Video Server provides access to Motion JPEG and MPEG-4 video and audio streams,
as well as to single JPEG images. Other applications and clients can also access these video and audio
streams/images directly, without going via the Live View page.
Video 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 constantly updated motion.
The Motion JPEG stream uses considerable amounts of bandwidth, but also provides excellent image quality
and access to each and 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, 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 Video Server 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
• Advanced Simple - in Axis products, this sets the coding type to MPEG-4 Part 2
AMC (AXIS Media Control) supports both object types, whilst e.g. QuickTime™ requires the Simple object type.
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 Video Server 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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