video codec SDK 9.1 NV_ENC_ERR_INVALID_VERSION when calling nvEncOpenEncodeSessionEx

Gaming and Visualization Technologies Video Processing & Optical Flow
1

I’m trying to build an encoding application. I’m using the nvenc documentation provided in the video codec sdk. I’ve hit a roadblock when attempting to open encode session. I’ve set the value of version to the #define const as said in the comments in nvEncodeAPI.h .Still i’m getting status 15 which means i’ve used wrong struct version (according to nvEncodeAPI.h). Any help in this regard is greatly appreciated

Here are the versions of toolkit i’m using

windows 10
visual studio 2019
Cuda toolkit: 10.2
video codec sdk: 9.1

i simplified the program for quick understanding

nvencfix.c

#include <nvEncodeAPI.h>
#include <stdio.h>
#include <stdint.h>
#include <cuda.h>

int main() {
    cuInit(0);
    int count;
    cuDeviceGetCount(&count);

    printf("%d is count\n",count);      // output: 1 is count

    // needed for initializing session
    CUdevice dev;
    CUcontext ctx; 
    NV_ENCODE_API_FUNCTION_LIST instance;

    // geting above parameters
    int status = cuDeviceGet(&dev, 0);
    printf("%d is cuDeviceGet\n", status);
    status = cuCtxCreate_v2(&ctx, 0, dev);
    printf("%d is cuCtxCreate_v2\n", status);
    status = NvEncodeAPICreateInstance(&instance);
    printf("%d is createInstance\n", status);

    // parameters for opening encoding session
    NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS params = {
        NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS_VER 
    };
    params.version = NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS_VER;
    params.device = dev;
    params.deviceType = NV_ENC_DEVICE_TYPE_CUDA;

    // calling the nvEncOpenEncodeSessionEx
    void* encoder = NULL;
    printf("%p is ENC before\n", encoder);          // output: 000000000000000 is ENC before
    status = instance.nvEncOpenEncodeSessionEx(&params, &encoder);
    printf("%d is openEncodeSession\n", status);    // output: 15 is openEncodeSession
    printf("%p is ENC after\n", encoder);           // output: 000000000000000 is ENC after 
    status = cuCtxDestroy_v2(ctx);                
    printf("%d is ctxDestroy\n", status);    // output: 0 is ctxDestroy
}
2

Hi.

Can you provide the driver version and GPU being used? Are you seeing the same issue when trying to execute SDK sample applications?

Thanks.