[FFmpeg-devel] Unable to compile with cuda

[Dylan Fernando]

On Sun, May 23, 2021 at 3:03 PM Dennis Mungai <dmngaie at gmail.com> wrote:

> On Sun, 23 May 2021 at 15:08, Dylan Fernando <dylanf123 at gmail.com> wrote:
>
> > I got it to work, with --enable-cuda as well, using:
> >
> > PKG_CONFIG_PATH="/home/dylan/Files/nv-codec-headers" ./configure
> > --enable-opencl --enable-vulkan --enable-libglslang --disable-stripping
> > --enable-nonfree --enable-cuda --enable-cuda-nvcc
> > --extra-cflags=-I/opt/local/cuda/include --nvccflags="-gencode
> > arch=compute_52,code=sm_52 -O2"
> >
> > Thanks,
> > Dylan
> >
> >
>
> Dylan,
>
> That has to be a very old build of FFmpeg. The option --enable-cuda has
> been deprecated for months. Try building from a current release or git
> master.
> For the LLVM route, you  can also pass nvccflags  in this fashion:
> --enable-cuda-llvm --nvccflags="--cuda-gpu-arch=sm_52 -O2".
> These flags will differ based on your current GPU and the CUDA version in
> use. See
>
> https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html#options-for-steering-gpu-code-generation
> FFmpeg's ./cconfigure script picks a very old set of flags that are
> deprecated in newer CUDA versions, hence the need to override these flags
> with CUDA builds. See:
> https://github.com/FFmpeg/FFmpeg/blob/master/configure#L4382
> The difference between the build with and without the proprietary CUDA SDK
> will be the inclusion of the scale_npp filters.
> With the proprietary SDK, both the scale_npp and scale_cuda filters will be
> available.
> With the cuda llvm route, only scale_cuda will be available.
> For more on their usage, see https://superuser.com/a/1650962/473795
> And for more on compiling cuda with llvm, see the llvm wiki entry here:
> https://llvm.org/docs/CompileCudaWithLLVM.html
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Hi Dennis, Timo,

I omitted --enable-cuda and it works correctly. I also switched to using
--enable-cuda-llvm.

Thanks,
Dylan