Axis-communications Axis 211A User Manual download pdf (Page 17)

AXIS 210A/211A - Video Streams

rtsp://<IP address>/mpeg4/media.amp

This path is for all supported

methods, and the client negotiates with the AXIS 210A/211A

to determine exactly which transport protocol to use.

Audio Stream Types

The 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

up to 4 kHz.

Audio transmission methods

The audio stream can be accessed in the Live

View page via Motion JPEG or MPEG-4.

Using Motion JPEG

The basic audio transmission method used in conjunction with Motion

JPEG video

streaming is transmission over HTTP. The video and audio streams are not synchronized

when using Motion JPEG, so the streams may be slightly out of sync. The latency in any

stream should be low, but this depends on the network infrastructure.

Using MPEG-4

When using MPEG-4, audio is streamed using the

same protocol as the video stream. When

audio is transmitted using MPEG-4, the AXIS 210A/211A sends synchronization

information along with the streams to the client performing the synchronization.

Note:

Audio is streamed from the client to the server over HTTP when using Motion JPEG and MPEG-4.

Accessing the Audio Streams

In addition to accessing audio in the Live View page using AMC, audio from the AXIS

210A/211A can also be accessed in the following ways:

HTTP API

You can read about accessing audio for the other protocols

through the VAPIX Application

Programming Interface (API) at http://www.axis.com/techsup

QuickTime/Windows Media Player

It is possible to use QuickTime and Windows Media Player

to listen to the audio stream

using the same methods to access video streams.

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Axis-communications Axis 211A User Manual Page 17

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