Axis Q1755, Руководство пользователя

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AXIS Q1755/-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 optimal 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 AMC are:
AMC negotiates with the camera 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 network camera includes one viewing client license. Installing additional unlicensed
copies of the viewing client is prohibited. To purchase additional licenses, contact your Axis reseller.
Unicast RTP 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.
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 10 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.