vvas_xskipframe

vvas_xskipframe plugin is used in video analytics pipelines in conjunction with vvas_xreorderframe plugin to control inference rate. It achieves this by using the user configured infer-interval property and determines which frames to be sent for inference and which frames to be skipped from inference. For example, if the infer-interval is 1, all frames are sent for inference, if infer-interval is 2, then every alternate frame is sent for inference.

This element has one sink pad and two source pads. It is multi-stream aware and its sink pad can connect with vvas_xfunnel element to accept frames from multiple streams. One source pad is connected to vvas_xinfer element to send the frames that are marked for inference, another source pad is connected to vvas_xreorderframe to send the frames marked skipped.

vvas_xskipframe plug-in adds frame id to the GstVvasSrcIDMeta metadata so that vvas_xreorderframe plug-in can identify the order of the frames.

Refer the example pipeline in vvas_xtracker plugin for the usage of vvas_xskipframe plugin along with vvas_xreorderframe plugin to achieve tracker usecase.

Input and Output

vvas_xskipframe plug-in is format agnostic and can accept any format on input and output pads.

Control Parameters and Plugin Properties

The following table lists the GStreamer plug-in properties supported by the vvas_xskipframe plugin.

Table 9: vvas_xskipframe plug-in properties

Property Name	Type	Range	Default	Description
infer-interval	UINT	1 to 7	1	Every n-th frame will be pushed to inference source pad. Here, ‘n’ represents inference interval.