Low GPU utilization when using NVENC 10 Bit

I'm a bit hesitant to call this a bug, maybe it is though.

With Identical settings, NVENC HEVC only uses about 15% of my GPU's video encode when 10 bit is selected, NVENC HEVC uses 90% of my GPU's video encode when 8 bit is selected. In 8 bit I get a real time export, while 10 bit takes 4-5 times longer for what seems to be no reason. Since I kind of need 10 bit for my export, this is a pretty big setback for the longer videos I render, since 30 minutes becomes 2 and a half hours.

Edit: I'm aware this could be Premiere being slow with handing frames to Voukoder.

Zitat von Kleinrotti

This is pretty normal when using 10 Bit instead of 8 Bit. Encoding takes a lot longer then.

But I'm not being limited by my hardware, it just isn't using it. The encoder in question can already encode a 4k60 10 bit video in real time with no frame drops, while playing a game, it's definitely not struggling in Premiere.

Zitat von Vouk

Voukoders processing path for > 8 bit is not optimized yet. Premiere delivers floating point data for high bit depth video. This needs to be converted to a pixel format that FFmpeg understands.

Is this the kind of thing a GPU could process?

Zitat von Vouk

But this is still to be done, and i have it planned for the voukoder successor.

Voukoder successor? When's that happening?

Sounds like it.

If you make any good progress I'd love to know.

Zitat von Vouk

The DirectX way doesn't work because there is no texture support of YUVA floats.

Trying CUDA ...

Zitat von Vouk

The DirectX way doesn't work because there is no texture support of YUVA floats.

Trying CUDA ...

You may also want to try Tensor. If it IS possible to leverage Tensor in this use case, Tensor should be WAY faster than Cuda.

Zitat von Vouk

I need to perform one FMA operation per sub-pixel. This can be parallelized with CUDA.

I'm not sure how I can archive this using tensor yet.

Alright, neither do I.