Bedienungsanleitung Axis 214 PTZ - Network Camera (Seite 11 von 53) (Englisch)

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AXIS 214 PTZ

Video and Audio Streams

The AXIS 214 PTZ provides several different image and video formats. The type you want to use depends

on your requirements and on the properties of your network.

The Li

ve 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 low bandwidth (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:

• Simpl

e - 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.

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Axis 214 PTZ - Network Camera Seite 11

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