Axis Communications 211a user manual Other MPEG-4clients, Audio Stream Types AXIS 210A/211A only

16AXIS 210/210A/211/211A - Video Streams

Other MPEG-4 clients

Although it may be possible to use other clients to view the MPEG-4 stream, this is not guaranteed by Axis.

For some other clients, e.g. QuickTime™ the Video Object Type must be set to Simple. It may also be necessary to adjust the advanced MPEG-4 settings.

To assess the video stream from e.g. QuickTime™ the following path can be used:

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

This path is for all supported methods, and the client will negotiate with the AXIS 210/210A/211/211A to determine exactly which transport protocol to use.

Audio Stream Types (AXIS 210A/211A only)

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 (AXIS 210A/211A only)

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 will depend 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.