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VideoXpert® Professional v 3.17 Operations Manual
C6601M-S | 06/22 135
Displaying Statistics
To display camera statistics over live video in the pane, right-click the cell for which you want to see
statistics, click Diagnostics, and then click Statistics. Perform this step again to hide the information.
Most statistics presented are self-explanatory; but a few statistics require some explanation:
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Call-up Time is a measure of how long it took between launching a stream and displaying the first
frame.
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Pipeline Latency is the amount of buffering used by the client. This directly adds to the end-to-end
latency between the camera and the display.
For example:If you have a camera with a 3-second GOP that does not force out iFrames upon
new client connections, it might take 3 seconds to call up the first frame, but you could still have
very low end-to-end latency thereafter.
Pipeline Latency is independent of Call-up Time.
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Displayed Frame Rate is the average number of frames displayed over a small time period. If
frames are dropped by the client, the value could be lower than the camera's configured frame-
rate. Because of those differences and because actual frame-rates are rarely whole numbers, the
rate is displayed to the second decimal point.
For example:the NTSCstandard is 29.7fps, not the 30fps typically shown in a camera
configuration UI. If the measured frame-rate is reporting higher than expected, it might be due to a
short averaging window. That is, it could be slower or faster at different points in time, but still at
the expected average rate over a longer time period.
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Display Jitter is a measure of "jittery" (unsmooth) is the frame presentation. Ideally, frames are
displayed smoothly (no jitter) at the exact frame interval of the camera.
For example:Frames from a 30fps source should be displayed at 1/30 second intervals, but if the
display is jittery, you will see a noticeable pattern of slow/fast, long/short intervals even though the
average frame-rate is still 30.
On many systems, client-side buffering is customer-configurable. Customers can hand-tune the
buffering by starting with the smallest value and increasing until visible jitter is minimized.
VideoXpert performs this configuration automatically; streams typically start with a small Pipeline
Latency value, and then the value will increase during the first few seconds of playback to reduce
jitter. Entering PTZinput mode forces the latency back to the minimum value, so that PTZcontrol
latency is minimized, potentially at the expense of presentation smoothness.
Measuring Latency
Note:This feature is available to Admin users only. It is used to measure the performance
(latency) of your system using a camera on the system. You must have access to the camera and
a monitor to which you can point the camera.
To measure end-to-end latency
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of the system using any camera:
1. Right-click the cell for the camera to view.
2. Click Diagnostics, click to select Measure Latency, and then click in the cell.
3. (Optional)Open the same camera in another cell, but do not dislpay the Measure Latency view.
This helps you better aim the camera at the barcode.
4. Point the camera at the barcode on the VxOpsCenter screen.
When the camera is able to read the barcode, the Scanning Success progress bar (green)begins
to fill in.
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