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AXIS 214 PTZ
Video and Audio Streams
The AXIS 214 PTZ 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 214
PTZ 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 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 AXIS 214 PTZ 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 214 PTZ 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 image settings.
Audio Stream Types
The audio stream types for audio are:
• G.711 - International standard for encoding wired-telephone audio. Uses PCM samples to compress
audio where higher signal
values are compressed more than lower values. In Axis products, this
sets the coding type to μ-law 64 kbit/s.
• G.726 - Uses PCM samples to code the difference between samples (ADPCM). Reduces bandwidth
without losing too
much useful audio. In Axis products, this sets the coded bit rate to 24 or 32
kbit/s.
All stream types are ITU-T standards and operate on frequencies
of up to 4 kHz.