User`s manual

14
AXIS Q1910/-E/AXIS Q1921/-E - Video Streams
Video Streams
The network camera 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 network camera 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 AXIS Media Control are:
AXIS Media Control negotiates with the camera to
determine the transport protocol to use. The order of priority, listed in the
AMC Control Panel, can be changed and the options disabled, to suit specific requirements.
Important!
H.2
64 and AAC are licensed technologies. The network camera includes one H.264 viewing client license and one AAC
audio client license. Installing additional unlicensed copies of the clients 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 network camera is to
use the AXIS Media Control (AMC) in Internet Explorer in Windows.
Unicast RTP This unicast method (RTP over UDP) is used 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 transmission, so
t
hat there is no video traffic on the network until a client
connects and requests the stream.
Note that there are a maximum
of 10 simultaneous uni-
cast connections.
RTP over RTSP This unicast method (RTP t
unneled 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 fire-
walls. Firewalls are commonly configured to allow
t
he HTTP protocol, thus allowing RTP to be tunneled.
Multicast RTP This method (RTP over UDP) should be us
ed 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 bandw
idth when there are large numbers of clients viewing
simultaneously. A multicast 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 co
unt as one unicast viewer in the maximum total of 10 simultaneous con-
nections.