add CUVID/CUDA hardware hardware acceleration for Nvidia

[ahjolinna]

Nvidia had deprecated VDPAU years ago in favor of their new CUDA based cuvid (which is crossplatform), so it would be good to have this on orion.

[mrgreywater]

I don't have a nvidia graphics card, but CUDA should be available with both the mpv and qtav backend in orion 1.66.

[ahjolinna]

I have the latest git version and I can only choose between vaapi and vdpau or auto.. no cuvid.

I use mpv backend version on openSUSE.. From my own repo (and yes mpv has cuda/cuvid enabled... As I use it just fine on mpc-qt)

[mrgreywater]

if you want to manually choose it, you can add nvdec-copy and cuda-copy here: https://github.com/alamminsalo/orion/blob/master/src/qml/MpvBackend.qml#L114

auto should already work though, if mpv thinks it's the best option for you, auto might use nvdec/cuda already. Sadly mpv doesn't support sharing those cuda surfaces with opengl, and therefore needs to do a costly copy via system memory.

[ahjolinna]

Also it's vaapi/vdpau -copy and some people have problems with that option.. At least on Linux

I don't remember what the -copy option causes to these people

[mrgreywater]

You can try using the non -copy versions, but afaik mpv doesn't support any of them with the opengl-cb video output or render api. This is an issue with mpv and not with orion. The QtAV player should have a zero copy CUDA renderer which you might use.

[ahjolinna]

I don't care personally about the -copy thing I just remember that it can cause issues with some.... I just wanted to mention that vdpau has been replaced with cuvid (long time ago)

[mrgreywater]

Should be fixed with #252

[mrgreywater]

The PR has been merged, I think this can be closed.