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AXIS 213 - Video and Audio Streams
Video and Audio Streams
The AXIS 213 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 213 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 213 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™.
• 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 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.