Slow render speed

[rwernyei]

Cantisque,

My results differ, I find NVIDIA CUDA encoding to be fast but inconsistent. As you experienced shimmering, I may see that only in a particular scene. On my laptop, I find Intel Quick Sync does the best job. I'm willing to sacrifice the CUDA speed to produce the sharpest quality. I still don't think it is a Corel issue, maybe poor programming not allowing full optimization of implementing code. So the lackluster results may look worse with Corel software when compared to others. Maybe someday Corel will allow third-party encoders for frameserving as it did in the past. This one works perfectly as a plugin with my DaVinci Resolve Studio 17 setup. https://www.voukoder.org/

[tletter]

It's definitely some sort of issue with VS and my current hardware or configuration, as it didn't used to be like this on my previous system.

As there are many HW and SW factors at play when using NVIDIA CUDA to render, the only approach is to try rendering with and w/o NVIDIA CUDA selected and see the result. As shown, in the following image, NVIDIA CUDA encoding works for me on my system running VS2021 as "4K H.264 videos rendered in VS with or w/o NVIDIA CUDA look identical wrt quality with near identical bitrate and file size. There is no appreciable difference in quality between the source clip and the rendered video."

tletter
https://www.youtube.com/user/tletter

[Cantisque]

Which I have done and already posted a comparison of on the previous page.

[cybernick]

I have tested several times in several codes. Always the CPU render is superior compared to Cuda in quality aspect.

It is a shame that we can use the process power we have available in GPUs.

[Davidk]

I'd agree with the various comments about programming interfaces and drivers.
In my case, it was the Intel graphics driver for the on m/b HD4400 chipset - which screwed up 2 editors (VS2021 and PD18) when using hardware acceleration on the same PC: the error messages were different but in each case the render broke. Turning off acceleration and relying on just the cpu only in both editors got a satisfactory result; completed OK, no obvious issues with the imagery, but just a bit longer in process. Since I try to restrict my editing efforts to projects not much longer than 15-20 minutes, the increase in render times is not world shattering. Short rendered clips are easy enough to combine in a final output, normally to disk or usb. The additional render time was not even long enough extra to get a cup of coffee.
Getting to that result (the graphics driver had a problem) took weeks of testing and Intel tech support in this case was very cooperative. It was their testing that found an issue with the driver which - since HD4400 was old and the technology superseded - the tech agent advised Intel was unlikely to fix.
The point here I think is that
- the interface and driver software may be the issue, not the editor
- and simple work practices can alleviate any technology acceleration problems.