nvcuvid problem from SDK 3.1 to 3.2.

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

I have an nvidia cuvid based decoder to decode H264 streams, I had a kernell witch was working properly to post-process each frame, it is something like this:

int DisplayPicture (............)

{

................

cudaLaunchMyKernel( devPtr, 

		pPreviousDecodedFrame,

		pResultFrame,

		nv12_frame,//nv12_frame

		nvw,nvh,

		pitch,

		mask_X,

		mask_Y);

	CUresult result;

	result = cuMemcpyDtoH(nv12_frame, devPtr, nv12_size);

    cuvidUnmapVideoFrame(session->cuDecoder, devPtr);

..........

If I copy the frame with “result = cuMemcpyDtoH(nv12_frame, devPtr, nv12_size);” it is properly copied and the result is 0 as there si not any CUDA ERROR.

The problem comes when calling cudaLaunchMyKernel function, ir I only try to do the same cuMemcpyDtoH the result is now CUDA_ERROR_INVALID_CONTEXT = 201.

It didn´t happen to me when I had the SDK 3.1 installed.

When I create the context I obtain 3010 version:

unsigned int version;

err = cuCtxGetApiVersion(Session.s_cuContext, &version);

printf("cuCtxGetApiVersion: %d\n", version);

I have read something about diferent calls for diferent versions but I really don´t undestand what is happening here. ¿Can any one help me?

Many thanks.

2

I am going to try to be more specific in my question, why is my context being created as 3010 version with cuCtxCreate() ??
How can I create a 3020 context? I have installed CUDA Toolkit 3.2, and SDK 3.2, also Developer Drivers for WinVista and Win7 (263.06).

Does any one can help me?

Thank you!

3

More Info:

When I start my nvcuvid decoder class I get the next results in the cmd:

cudaSetDevice(0): 0 //Ok Device 0 set properly.
cuCtxCreate: 0 //Context created properly.
cuCtxGetApiVersion: 3010 //Context created as 3.1 version

//My CUDA versions are…
cudaRuntimeGetVersion() 3020
cudaDriverGetVersion(version) 3020

Any Ideas on how to geta context to be 3020?

4

Do you uninstall prev version of sdk? Could it be some path issue. Also check cudart.dll version you loaded.

5

Yes , I did uninstall it. How can I chek the cudart.dll ?

6

Cudart is versioned. Maybe you mix in one application different versions of cudart. Maybe your decoder dll uses other cudart version.