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Within the capture module is less than video data?

DM8148 EVM; DVRRDK4.1

In function Int32 CaptureLink_drvProcessData (CaptureLink_Obj * pObj) ,
FVID2_dequeue (pObj - > fvidHandleVipAll, & frameList, streamId, BIOS_NO_WAIT);
Don't read data queue;

What is the problem?