Nvidia NVEnc output corrupt when enableSubFrameWrite = 1 - c++

Question

My preset:
m_stEncodeConfig.encodeCodecConfig.hevcConfig.sliceMode = 3u;
m_stEncodeConfig.encodeCodecConfig.hevcConfig.sliceModeData = (uint32_t)m_stEncodeStreamInfo.nMaxSliceNum; //4
m_stCreateEncodeParams.reportSliceOffsets = 1;
m_stCreateEncodeParams.enableSubFrameWrite = 1;
code of process output:
NV_ENC_LOCK_BITSTREAM lockBitstreamData;
memset(&lockBitstreamData, 0, sizeof(lockBitstreamData));
lockBitstreamData.version = NV_ENC_LOCK_BITSTREAM_VER;
lockBitstreamData.outputBitstream = pEncodeBuffer->stOutputBfr.hBitstreamBuffer;
lockBitstreamData.doNotWait = 1u;
std::vector<uint32_t> arrSliceOffset(m_stEncodeConfig.encodeCodecConfig.hevcConfig.sliceModeData);
lockBitstreamData.sliceOffsets = arrSliceOffset.data();
while (true)
{
NVENCSTATUS status = m_pEncodeAPI->nvEncLockBitstream(m_hEncoder, &lockBitstreamData);
auto tick = int(std::chrono::steady_clock::now().time_since_epoch().count() / 1000000);
if (status == NVENCSTATUS::NV_ENC_SUCCESS)
{
if (lockBitstreamData.hwEncodeStatus == 2)
{
static std::ofstream of("slice.h265", std::ios::trunc | std::ios::binary);
of.write((char*)lockBitstreamData.bitstreamBufferPtr, lockBitstreamData.bitstreamSizeInBytes);
of.flush();
break;
}
NVENCAPI_CALL_CHECK(m_pEncodeAPI->nvEncUnlockBitstream(m_hEncoder, lockBitstreamData.outputBitstream));
}
else
{
break;
}
}
play bitstream:
ffplay -i slice.h265
output : Packet corrupt
arrSliceOffset[0] always = 255.
I watch the memory from VS Debug and compare with enableSubFrameWrite = 0,the bitstreamSizeInBytes less of valid data size . It’s BUG or I loss some details? Anybady can tell me how can I correct use of enableSubFrameWrite