User`s guide

18 Properties — Alphabetical List
18-16
FrameGrabInterval
Specify how often to acquire frame from video stream
Description
The FrameGrabInterval property specifies how often the video input object acquires a
frame from the video stream. By default, objects acquire every frame in the video stream,
but you can use this property to specify other acquisition intervals.
Note Do not confuse the frame grab interval with the frame rate. The frame rate
describes the rate at which an image acquisition device provides frames, typically
measured in seconds, such as 30 frames per second. The frame grab interval is measured
in frames, not seconds. If a particular device's frame rate is configurable, the video source
object might include the frame rate as a device-specific property.
For example, when you specify a FrameGrabInterval value of 3, the object acquires
every third frame from the video stream, as illustrated in this figure. The object acquires
the first frame in the video stream before applying the FrameGrabInterval.
You specify the source of the video stream in the SelectedSourceName property.