Nvidia linux. Add encoder nvenc

[Toxblh]

Added NVenc encoder for Linux.

The current solution is to implement a loop to get the Vulkan frame and copy that through the CPU to the GPU again.
Current latency in my case is in the range of 5-10ms for encoding. But that is already playable quality and latency.

I introduce a new flag --no-nvidia to build in dev mode for people with Intel/AMD cards, which is not required to install Nvidia libs to their machines. The flag should pass together with --bundle-ffmpeg like example cargo xtask build-server --bundle-ffmpeg --no-nvidia. But if you will link to the existing FFmpeg on your machine it's don't need to provide at all, it's only like a modification flag for --bundle-ffmpeg.

For devs with Arch need to create a symbolic link from /opt/cuda to /usr/local/cuda because current scripts are prepared to be built in CI for the final release.

CEncdoder is a change from waiting for an answer to skipping to sending the current frame because nvenc is required more than one frame to encode. And PushFrame returns try_again error till the next frames what it created infinity loop of waiting.

AppImage with nvenc included
ALVR-x86_64.zip

[Toxblh]

alvr_server_linux.zip

[Incuh]

On Arch, all of the cuda tools are in /opt/cuda/bin & lib64 and cannot be found when bundling ffmpeg.

Can someone verify if that's also the case for other distros.

[Incuh]

A symbolic link from /opt/cuda to /usr/local/cuda seems to work

[xytovl]

All comments are pretty minor, the PR seems good overall

[ckiee]

Nitpicks and grammar, I'll commit some fixes then hopefully merge.

[ckiee]

Rebased from master to fix merge conflict so CI runs.

[xytovl]

I see you have added packaging/rpm/cuda.pc, this should not be needed at all. It is the responsibility of the distribution to ship the file with a cuda package.
Adding it here will most probably breaks compile for those who have cuda in a different location, such as /opt.

[Toxblh]

I see you have added packaging/rpm/cuda.pc, this should not be needed at all. It is the responsibility of the distribution to ship the file with a cuda package.
Adding it here will most probably breaks compile for those who have cuda in a different location, such as /opt.

For fedora we don’t have a package, need to install from nvidia site. This don’t use right now, I put here as example the file, which will require for smooth dev process

[xytovl]

I see you have added packaging/rpm/cuda.pc, this should not be needed at all. It is the responsibility of the distribution to ship the file with a cuda package.
Adding it here will most probably breaks compile for those who have cuda in a different location, such as /opt.

For fedora we don’t have a package, need to install from nvidia site. This don’t use right now, I put here as example the file, which will require for smooth dev process

Fine for me then.