GPU Rendering

[Dan Dennedy]

On Wed, Aug 12, 2020 at 8:07 AM Evert Vorster <evorster at gmail.com> wrote:

> Hey Paul.
>
> There are ways to use GPU rendering in the output. However you typically
> exchange quality for speed & size.
>
>
>
> ie: rendering out at q=26 on software looks better than rendering out at
> q=26 on hardware.
>
> This is because the software encoders are more mature and can use features
> in the CPU that the GPU cannot.
>
>
This is not necessarily always true as of the 6th generation Turing NVENC.
It is generally considered now as good as x264 and x265 at medium preset:
https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/
https://unrealaussies.com/tech/nvenc-x264-quicksync-qsv-vp9-av1/7/#NVENC-Part-2
(you can find more studies)

Turing cards are RTX 20xx and GTX 1650 Super:
https://en.wikipedia.org/wiki/Nvidia_NVENC#Sixth_generation,_Turing_TU10x/TU116

If you want to use HEVC to limit size while maximizing quality, Turing
NVENC HEVC makes a lot of sense since it is so much faster than x265 or
vp9. If you are going to output H.264 I think it is less compelling
considering the speed of x264.


Here is a profile that I was using to test nvenc:
>
> properties=x264-medium f=mp4 vcodec=h264_nvenc acodec=aac g=120
> crf=%quality ab=%audiobitrate+'k'
>
>
> Kind regards,
> Evert Vorster
> Awesome Chapters Tours
> http://www.awesomechapters.com
> Tel: +264 (0) 811477690
>
>
> On Wed, 12 Aug 2020 at 17:01, Paul Smith <paulsrsmith at live.co.uk> wrote:
>
>> Hi,
>>
>> I really like KdenLive. Seems pretty intuitive to use. The on;y thing I
>> couldn't quite figure out going through the settings is, does it use the
>> Nvidia GPU for rendering? If not is that something on the horizon? If so
>> I'm happy to donate towards it's development.
>>
>> Kind Regards
>>
>> Paul
>>
>
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