Installation Manual

427-0089-00-12 Version 160 March 2019 45
This document does not contain any export-controlled information.
Advanced Configuration
Caution!
The parameters in the Encoding section will have a
significant impact on the quality and bandwidth
requirements of the video stream. In general it is
recommended that the default values are used initially, and
then individual parameters can be modified and tested
incrementally to determine if the bandwidth and quality
requirements are met.
For the video streams, the Codec options are MPEG4
RTSP, H.264 or MJPEG. MPEG4 RTSP requires the least
amount of processing, and MJPEG requires the most.
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
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 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.
Adjustments to these settings should only be made by someone trained with thermal cameras
and a thorough understanding of how the various settings affect the image.
Haphazard changes can lead to image problems including a complete loss of video.
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