Thanks Nara,
How to know(calculate) exactly the value of numBufPerCh and displayDelay. Maybe that value only correct for my case but not sure correctness for an other case.
Now my decoder can work but sometime got error :Assertion @ Line: 665 in links_m3video/iva_dec/decLink_common.c: (freeFrameInfo->pVdecOrgFrame == NULL) && (freeFrameInfo->vdecRefCount > 0) : failed !!!