Configuring the Camera AW00097209000
34 Basler IP Fixed Box Cameras
Note that increasing the level of frame rate scaling will decrease the bandwidth used to stream
images from the camera to a device.
Note that if the Encoder Type parameter is set to JPEG (triggered), the Frame Rate Scaling
parameter setting will be fixed at 1:1.
GOP Length [ms] - If the Encoder Type parameter is set to H.264 or MPEG4, then the GOP Length
parameter will set the time between I-frames in milliseconds.
In an H.264 or an MPEG stream, the camera transmits periodic I-frames and transmits several
P-frames between each I-frame. I-frames carry complete information for a captured image.
P-frames only carry information about the areas of the image that have changed since the last
I-frame was transmitted. The time between the transmission of I-frames is determined by the GOP
Length parameter. Increasing the time between I-frames (i.e., the GOP length) will increase the
efficiency of the encoder. But be aware that increasing the GOP length also increases the latency
when you start an image stream because the decoder in the receiving device must wait longer for
the initial I-frames.
Live Buffer Size [kbyte] - Sets the size (in kilobytes) of the live buffer for the stream. The live
buffer is a ring buffer that stores the last N captured images for the stream (N depends on the size
of the images being encoded and the size of the buffer).
Alarm Buffer Size [kbyte] - Sets the size (in kilobytes) of the alarm buffer for the stream.
Normally, the alarm buffer is simply a ring buffer that stores the last N captured images for the
stream (N depends on the size of the images being encoded and the size of the buffer). But when
an alarm condition is declared, the alarm buffer will only continue to buffer post alarm images until
the portion of the buffer that is allocated for post alarm image storage is full (see the next
parameter). At that point, buffering will stop, and the pre and post alarm images held in the buffer
will be retained until a new Alarm Buffer Arm command is issued (see Section 3.6.2 on page 44).
Post Alarm Buffer Size [kbyte] - Sets the portion of the alarm buffer (in kilobytes) that will be
used for "post alarm" image storage. For example, if the Alarm Buffer Size parameter is set to 2048
kilobytes and the Post Alarm Buffer Size parameter is set to 1228 kilobytes, then 1228 kilobytes (i.e.,
60%) of the alarm buffer will be allocated for holding post alarm images.
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