dxva2 decode h264

老周杂家 1

when I use dxva2 decode h264，CreateDevice success when cable connect monitor，otherwise CreateDevice return fail when turn off monitor。video card is nvidia ti 1080. why?

Rita Han - MSFT 2,166 Reputation points

2020-08-31T08:23:17.503+00:00

Assume you are talking about this API: IDirect3D9::CreateDevice. I test this official sample: dxva2_videoproc with Intel HD Graphics 530, CreateDevice return success even when I power off the display monitor and unplug the connection cable. (I only have one display attached in this test case). Can you try this official sample to see if it works for you? If not, can you show error code of CreateDevice failure?
老周杂家 1 Reputation point

2020-08-31T17:28:53.733+00:00

IDirectXVideoDecoderService->GetDecoderDeviceGuids() return E_FAIL if unplug the connection cable.i can't get the SupportHWGuidList.

Rita Han - MSFT 2,166

IDirectXVideoDecoderService->GetDecoderDeviceGuids() works for me after unplug the connection cable. I create the demo by adding the following code after this line: g_pD3DD9->GetBackBuffer(). You can have a try.

// Create DXVA2 Video decoder Service.
IDirectXVideoDecoderService* decoderService = NULL;
hr = DXVA2CreateVideoService(g_pD3DD9,
    IID_IDirectXVideoDecoderService,
    (VOID * *)& decoderService);
while (true)
{
    UINT devGuidcount = 0;
    GUID* guidArr[100];
    hr = decoderService->GetDecoderDeviceGuids(&devGuidcount, &guidArr[0]);
    if (FAILED(hr))
    {
        DBGMSG((TEXT("GetDecoderDeviceGuids failed with error 0x%x.\n"), hr));
        return FALSE;
    }
}

老周杂家 1 Reputation point

2020-09-02T04:51:23.943+00:00

I unplug the connection cable.GetDecoderDeviceGuids() success if video card is Intel UHD Graphics 620. E_FAIL if video card is nvidia ti 1080.
Rita Han - MSFT 2,166 Reputation points

2020-09-02T08:19:36.59+00:00

There seems a compatible / driver issue. Please contact the video card supplier for help.

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