Video And Audio Streams; How To Stream H.264; Motion Jpeg - Axis Q7404 User Manual

Video and Audio Streams

The video encoder provides several image and video stream formats. Your requirements and the properties of your network
will determine the type you use.
The Live View page in the video encoder provides access to H.264 and Motion JPEG video streams, audio streams and to the
list of available stream profiles. Other applications and clients can also access the video and audio streams directly, without
going via the Live View page.

How to stream H.264

This video compression standard makes good use of bandwidth, and can provide high quality video streams at less than 1
Mbit/s.
Deciding which combination of protocols and methods to use depends on your viewing requirements, and on the properties of
your network. The available options in AXIS Media Control are:
Unicast RTP
RTP over RTSP
RTP over RTSP over
HTTP
Multicast RTP
AXIS Media Control negotiates with the video encoder to determine the transport protocol to use in the order listed above.
This order can be changed and the options disabled, to suit specific requirements.
Important!
H.264 and AAC are licensed technologies. The video encoder includes four H.264 licenses (one for each channel) and one
AAC license. Installing additional unlicensed copies of the viewing client is prohibited. To purchase additional licenses,
contact your Axis reseller.

Motion JPEG

This format uses standard JPEG still images for 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 provides excellent image quality and access to every
image contained in the stream. The recommended method of accessing Motion JPEG live video from the video encoder is to
use the AXIS Media Control in Internet Explorer in Windows.
This unicast method (RTP over UDP) should
be your first consideration for live unicast
video, especially when it is important to
always have an up-to-date video stream,
even if some images are dropped.
This unicast method (RTP tunneled over
RTSP) is useful as it is relatively simple to
configure firewalls to allow RTSP traffic.
This unicast method can be used to traverse
firewalls. Firewalls are commonly configured
to allow the HTTP protocol, thus allowing
RTP to be tunneled.
This method (RTP over UDP) should be used for live multicast video. The video stream is always
up-to-date, even if some images are dropped.
Multicasting provides the most efficient usage of bandwidth when there are large numbers of cli-
ents viewing simultaneously. A multicast broadcast cannot however, pass a network router unless
the router is configured to allow this. It is not possible to multicast over the Internet, for example.
Note also that all multicast viewers count as one unicast viewer in the maximum total of 20
simultaneous connections.
AXIS Q7404 - Video and Audio Streams
Unicasting is used for video-on-demand broadcasting,
so that there is no video traffic on the network until a
client connects and requests the stream.
Note that there are a maximum of 20 simultaneous
unicast connections.
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