FLIR F-Series Installation Manual page 23

F-Series Installation Manual
are shared by streaming clients, so additional clients do not cause bandwidth consumption to
go up as dramatically. If the video streams are to be sent to more than one client/location, it
may be wise to use multicast instead for more efficient bandwidth usage.
Note
if more than one camera is providing multicast streams on the network, be sure to configure
each with a unique multicast Destination Network IP address.
Settings
For each video stream, the Codec Type options are MPEG4, H.264 or MJPEG. The Bit Rate
parameter is only used when the Rate Control parameter is set to CBR (Constant Bit Rate).
With the CBR setting, the system attempts to keep the resulting bit rate of the video at or near
the target bit rate.
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 lower bandwidth and quality.
The Image Size parameter controls the video resolution size and therefore can have a
considerable impact on bandwidth usage. The larger the size of the frame, the better the
resolution and the larger the network bandwidth required. The following table provides the
corresponding resolution for each Image Size setting.
Table 3-1: Image Size Settings
Image Size
D1
4CIF
VGA
CIF
SIF
QVGA
QCIF
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.
The Interlaced parameter controls if the video frames are interlaced or not. Interlacing is
defined as the interleaving of two video fields to produce a frame and is typically adopted to
reduce screen flicker for a given frame rate. By default, it is set to Yes for the DLTV video
stream.
427-0030-00-12, version 150
NTSC
720x480 720x576
704x480 704x576
640x480
N/A 320x240
353x240 352x288
320x240
N/A 176x144
January 2012
3—F-Series Camera Configuration
PAL
N/A
N/A
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