User Guide

427-0089-00-12 Version 180 August 2020 46
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Advanced Configuration
The I-Frame Interval parameter controls the number of P-frames used between I-frames. I-frames
are full frames of video and the P-frames contain the changes that occurred since the last I-frame. A
smaller I-Frame Interval results in higher bandwidth (more full frames sent) and better video quality.
A higher I-Frame Interval number means fewer I-frames are sent and therefore results in possibly
lower bandwidth and possibly lower quality.
The Resolution parameter controls the video resolution and therefore can have a large impact on
bandwidth usage. The higher the resolution, the larger the size of the frame and the higher the
network bandwidth required. Table 3-3 provides the corresponding resolution for each setting.
As a rule of thumb, if the video will be viewed on its own and on a reasonably large screen, a large
image size setting may look better. On the other hand, if the video is shown as a tile in a video wall,
a smaller image size may look as good and consume less bandwidth.
Network Settings: For enhanced security, RTSP
authentication can be enabled.
By default, the video streams from the camera are sent
using unicast packets rather than multicast. This means a
given packet of IP Video will be sent separately to each
client that has that video stream open. Therefore each
additional client will cause the bandwidth to increase and
cause more overhead on the system in comparison to
multicast.
The Multicast option can be used to limit how much
bandwidth is required for multiple clients, but it requires a
higher level of network administration and an
understanding of how multicast traffic is manged (multicast
addresses, routers and switches, and so on). With Multicast enabled, new fields are shown,
Destination Network IP address and Destination Port, as well as TTL (time-to-live). If more than one
camera is providing multicast streams on the network, be sure to configure each stream with a
unique multicast Destination Network IP address and Destination Port combination.
The time-to-live field controls the ability of IP packets to traverse network or router boundaries. A
value of 1 restricts the stream to the same subnet. Values greater than 1 allow ever increasing
access between networks.
Table 3-3: Image Size Settings
Resolution NTSC PAL
NATIVE 640 x 512 640 x 512
D1 720 x 480 720 x 576
VGA 640 x 480 640 x 480
CIF 352 x 240 352 x 288
CIF4 704 x 480 704 x 576
QNATIVE 320 x 256 320 x 256