User Guide

427-0075-01-12 Revision 140 October 2019 31
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Basic Operation and Configuration
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 H.264 Main
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 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 2-1 provides the corresponding resolution for each setting.
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 default RTP Settings for connecting to an IP video
stream from the PT-Series HD are shown in the
illustration. The RTP Port and the Stream Name are used
when establishing a session from a client.
The connection string for each of the video streams are
as follows:
VIDEO 0 - rtsp://192.168.0.250:554/stream1/sensor1
VIDEO 1 - rtsp://192.168.0.250:554/stream2/sensor1
VIDEO 2 - rtsp://192.168.0.250:554/stream1/sensor2
VIDEO 3 - rtsp://192.168.0.250:554/stream2/sensor2
a. Factory default resolution is shown in bold type.
VIDEO - 0
VIDEO - 1
VIDEO - 2
VIDEO - 3