[Libav-user] av_hwdevice_ctx_create fails when using AV_HWDEVICE_TYPE_CUDA

[Santosh Kamble]

Helo,
I am trying to decode a video stream in C++ application using ffmpeg cuda
hardware acceleration.
My windows machine has GPU is GTX1060  Update driver version 512.59


err = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_CUDA,
NULL, NULL, 0)

Function fails with errorcode -12
but when I pass AV_HWDEVICE_TYPE_DXVA2, it succeeds.

----------------------------
My observations about ffmpeg cuda compiled tool :
  I observed that cuda based image decoding and video decoding is working
fine using ffmpeg tool as below example works and use GPU for decoding
purpose.
ex1. ffmpeg -hwaccel cuda -i "D:\myvideo.avi"  output.mp4
ex2. ffmpeg -hwaccel cuda -i D:\myvideo.mp4 -y ./tests/%04d.jpg

also the tool shows it supports cuda hardware acceleration.
command:  ffmpeg.exe -hwaccels
output: ffmpeg version 4.4.git Copyright (c) 2000-2022 the FFmpeg developers
  built with Microsoft (R) C/C++ Optimizing Compiler Version 19.29.30140
for x64
  configuration: --enable-nonfree --enable-shared --enable-ffnvcodec
--enable-cuda-llvm --enable-gpl --disable-debug --enable-cuda-nvcc
--enable-libnpp --toolchain=msvc --extra-cflags=-I../nv_sdk
--extra-ldflags='-libpath:../nv_sdk' --nvccflags='-gencode
arch=compute_60,code=sm_60 -O2'
  libavutil      57. 24.101 / 57. 24.101
  libavcodec     59. 28.100 / 59. 28.100
  libavformat    59. 23.100 / 59. 23.100
  libavdevice    59.  6.100 / 59.  6.100
  libavfilter     8. 38.100 /  8. 38.100
  libswscale      6.  6.100 /  6.  6.100
  libswresample   4.  6.100 /  4.  6.100
  libpostproc    56.  5.100 / 56.  5.100
Hardware acceleration methods:
cuda
dxva2
d3d11va


-----------------------------------------


So it looks like the compiled libraries are fine. I am missing some other
thing.
Can someone help on this cuda based decoding using ffmpeg.


Thanks
Santosh
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