I just modified captureLink_drv.c to do that.
I added processing in CaptureLink_drvStart: If frames are flushed(called CaptureLink_drvStop before),
re-queue frames to driver before calling FVID2_start by call FVID2_queue without any error.
I only use one capture instance(PORTA) with non-mux 16bit embedded sync mode.
In host(A8), I just do System_linkStart, System_linkStop, System_linkStart in steps.
After the second System_linkStart calling, there will no captured data.
But the port status could detect the width and height of video sources.