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11
AXIS Q7414 - Video Streams
Video 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 Li
ve View page in the video encoder provides access to H.264 and Motion JPEG video streams, and to the list of available
stream profiles. Other applications and clients can also access these video streams/images 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 AMC are:
Unicast RTP This unicast method (RTP over UDP) should
be your fi
rst 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.
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 maxim
um of 20 simultaneous
unicast connections.
RTP over RTSP This unicast method (RTP tunneled over
RTSP) is useful as it is relatively simple to
configure firewalls to allow RTSP traffic.
RTP over RTSP over
HTTP
This unicast method can be used to traverse
firewalls. Firewalls are commonly configured
to allow the HTTP protocol, thus allowing
RTP to be tunneled.
Multicast RTP 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 10
simultaneous connections.
AMC 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 is licensed technology. The video encoder includes one viewi
ng client 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 AXIS Media Control (AMC) in Microsoft Internet Explorer in Windows.
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