System.AccessViolationException on avcodec_open2 using FFMpeg.AutoGen

Question

I am using FFMpeg.AutoGen (v6.0.0.2) with hwencode support for Nvidia cards, and in few devices (for example on NVIDIA GeForce MX350) when I am doing fffmpeg.avcodec_open2 I got the following ffmpeg message in logs:

[h264_nvenc @ 000001f473fcc480] OpenEncodeSessionEx failed: unsupported device (2): (no details)

And then it crashes with the following crash:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at FFmpeg.AutoGen.DynamicallyLoadedBindings+<>c.<Initialize>b__2_494(FFmpeg.AutoGen.AVCodecContext*, FFmpeg.AutoGen.AVCodec*, FFmpeg.AutoGen.AVDictionary**)
   at FFmpeg.AutoGen.ffmpeg.avcodec_open2(FFmpeg.AutoGen.AVCodecContext*, FFmpeg.AutoGen.AVCodec*, FFmpeg.AutoGen.AVDictionary**)
   at GraphicsCheck.FfmpegChecker.StartEncoder(Omni.Platforms.Windows.Services.AV.CodecInfo, Int32, Int32, Int32)
   at GraphicsCheck.FfmpegChecker.CheckConfig(CodecConfig)
   at Program.<Main>$(System.String[])

I created a sample app to demo this issue. And following the path of the calls..

1. That happens at nvenc_open_session and is called here
2. That would cause going to fail2 routine, which is this one:

fail2:
    CHECK_CU(dl_fn->cuda_dl->cuCtxDestroy(ctx->cu_context_internal));
    ctx->cu_context_internal = NULL;

3. ctx->cu_context_internal comes from (in same method) then I suppose it was created properly (as otherwise wouldn't continue).

    ret = CHECK_CU(dl_fn->cuda_dl->cuCtxCreate(&ctx->cu_context_internal, 0, cu_device));
    if (ret < 0)
        goto fail;

4. ctx in that method is the priv_data of AVCodecContext as we can see here:

static av_cold int nvenc_check_device(AVCodecContext *avctx, int idx)
{
    NvencContext *ctx = avctx->priv_data;

5. Also the act of printing the error message, on nvenc_print_error, is interacting with context.

static int nvenc_print_error(AVCodecContext *avctx, NVENCSTATUS err,
                             const char *error_string)
{
    const char *desc;
    const char *details = "(no details)";
    int ret = nvenc_map_error(err, &desc);

#ifdef NVENC_HAVE_GETLASTERRORSTRING
    NvencContext *ctx = avctx->priv_data;
    NV_ENCODE_API_FUNCTION_LIST *p_nvenc = &ctx->nvenc_dload_funcs.nvenc_funcs;

    if (p_nvenc && ctx->nvencoder)
        details = p_nvenc->nvEncGetLastErrorString(ctx->nvencoder);
#endif

    av_log(avctx, AV_LOG_ERROR, "%s: %s (%d): %s\n", error_string, desc, err, details);

    return ret;
}

6. av_log is executed as we can see the error message on logs then the other lines shouldn't be a problem.

7. Seeing the other calls, when nvenc_check_device fails the error is going up to nvenc_check_device -> nvenc_setup_device but we aren't seeing more logs then the issue may be on nvenc_check_device on fail2 routine or on nvenc_print_error

Any thoughts ?