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I use VideoCapture class to open a USB camera. Windows10, Visual Studio 2015, Opencv4.0.

VideoCapture cap; cap.open(0);

But the "cap.open(0)" line takes a long time to open my USB camera. The output of VS is, either "Loading {dir}\amdhd164.dll, cannot find or open PDB file.", or "Uninstalled {dir}\amdhd164.dll". This process continue for almost 1 min then the camera is opened. Together there is also "libmfxhw64.dll" file, cannot be find or opened.

I changed different cameras, the same thing still happened but take a much shorter time.

My question is, why this happened? My configuration for vs or opencv is not correct, or missing files?

(After some errors, lasting for almost 1 min, then the camera can be opened.)

I use VideoCapture class to open a USB camera. Windows10, Visual Studio 2015, Opencv4.0.

VideoCapture cap; cap.open(0);

But the "cap.open(0)" line takes a long time to open my USB camera.

The output of VS is, either "Loading {dir}\amdhd164.dll, cannot find or open PDB file.", or "Uninstalled {dir}\amdhd164.dll". This process continue for is continously "Failed to create ID3D11DeviceContext", and after almost 1 min then min, it opened the camera is opened. Together there is also "libmfxhw64.dll" file, cannot be find or opened.successfully.

I changed different cameras, have change to another camera, no error occurred. And the same thing still happened but take a much shorter time.

My question is, camera on other computer, no error, too. So why this happened? My configuration for vs camera on this laptop got trouble? What should be the problem, on computer or opencv is not correct, or missing files?

(After some errors, lasting for almost 1 min, then the camera can be opened.)camera? Thanks.