8k render settings Davinci Resolve studio 18 windows

barnyz · Nov 26, 2022

Hello. I recently acquired a canon r5c (an irresistible black friday deal)

After recording some test 8k footage i was able to import and grade it without problem in davinci resolve studio 18 windows version. However when trying to export at h265 it simply crashes every time (my quick search makes me believe my laptop is a little underspecced.

So i read i should export in DNxHR and then convert in Handbreak to whatever i want. This works no problem but the issue is the DNxHR files are massive. For example a 30sec test clip came out at 24.7gb and takes a very long time to render and then another lengthy time to convert in handbreak. When choosing DNxHR there is another drop down with several different options. I cant find a good explanation of what the differences are between them all so does anyone know if any of them are smaller but still good or can anyone recommend a better intermediate codec to export to in resolve?

sludge21017 · Nov 26, 2022

Turn off GPU rendering, and try CPU for now.

NickZ2016 · Nov 26, 2022

Okay I'm half awake. You want to know the differences between DNX types? Wiki is your friend.

DNxHR codec - Wikipedia

en.wikipedia.org

apekkpul · Nov 26, 2022

If your laptop has Intel CPU, have you turned Intel Quicksynck on?

Does the Resolve crash if you export to H.264?

Hendrik_nl · Nov 26, 2022

Could it be that your GPU memory is not sufficient?

barnyz · Nov 27, 2022

sludge21017 said:
Turn off GPU rendering, and try CPU for now.

that totally worked! Thank you you are a star. I searched so many threads and forums and you are the first to suggest that. I was able to render out a 2.5min test video in h265 with some basic colour grading, fusion text and audio, it took quite a long time (10mins) but the CPU was normally at about 30-60% and memory at about 8gb and the GPU was constantly very high but never crashing.

barnyz · Nov 27, 2022

NickZ2016 said:
Okay I'm half awake. You want to know the differences between DNX types? Wiki is your friend.

https://en.wikipedia.org/wiki/DNxHR_codec

thanks, that is great, i never thought to look at wiki for that type of info

barnyz · Nov 27, 2022

apekkpul said:
If your laptop has Intel CPU, have you turned Intel Quicksynck on?

Does the Resolve crash if you export to H.264?

Hey thanks. It's an AMD laptop (AMD5800, 16gb ram, Nvidea 3070). Resolve does not allow me to choose h.264 with 8k so i couldnt test that

barnyz · Nov 27, 2022

Hendrik_nl said:
Could it be that your GPU memory is not sufficient?

thanks. Yep that definitely seemed to be the problem as using the CPU as suggested seemed to work just fine (and it didnt seem to tax the AMD5800 much either although it did take a very long time)

Interestingly the section that I shot in 8k raw LT rendered out fine with CPU but when i play the finished movie back in windows using the standard movie player it has no problem playing the sections that were recorded in non raw format but when it gets to the parts that were raw it basically chugs and because almost unwatchable, the performance monitor seems to suggest the 8gb GPU is bottle necking that part so its clear I will likely need to upgrade to a better PC at some point (my current laptop is a lenovo legion 5 gaming laptop with amd5800, 16gb ram and nvidea 3070 so im surprised it worked as well as it did seeing as its well below recommended specs for 8k).

barnyz · Nov 27, 2022

Unfortunately when trying a more advanced test video with some basic transitions and slow motion I'm back to problems. It's not crashing but I'm getting an out of gpu memory error no matter if its h265 with native encoder or a DNxHR one. From what I've read a 20gb+ gpu is recommended for 8k... but that means a 3090 or 4090 and they are in crazy money territory... does anyone know any other options for rendering 8k?

Hendrik_nl · Nov 27, 2022

barnyz said:
Unfortunately when trying a more advanced test video with some basic transitions and slow motion I'm back to problems. It's not crashing but I'm getting an out of gpu memory error no matter if its h265 with native encoder or a DNxHR one. From what I've read a 20gb+ gpu is recommended for 8k... but that means a 3090 or 4090 and they are in crazy money territory... does anyone know any other options for rendering 8k?

What I understand, you can edit in 8K RAW but not render 8K footage with less than 20GB+ ram. I’m not sure what GPU is needed for that. It’s a question I also have. Maybe Cloud computing is and option?

That said, why output a 8K file? There are almost no displays in the world that can use the extra resolution. If you ever need 8K in the future, you can render it at that moment. 4K is still the highest relevant resolution.

avidly lucid · Nov 27, 2022

Yes. You don't need to render in 8K. What I do with Canon R5 8K RAW is just do color correction and sharpening, etc.--just a few things that are good to do in RAW. Then render to 6K or 4K and finish the editing with smaller non-RAW files so it doesn't tax your system so much.

NickZ2016 · Nov 27, 2022

Have you tried just setting your timeline to 4K? That should reduce memory requirements.

Hendrik_nl · Nov 28, 2022

NickZ2016 said:
Have you tried just setting your timeline to 4K? That should reduce memory requirements.

@TS This is a good advice. Even setting the timeline to 1080 is a good option. You can always change it to 4K when rendering.

Maybe interesting: https://blog.frame.io/2020/02/24/davinci-resolve-performance/

barnyz · Nov 28, 2022

Hendrik_nl said:
barnyz said:

Unfortunately when trying a more advanced test video with some basic transitions and slow motion I'm back to problems. It's not crashing but I'm getting an out of gpu memory error no matter if its h265 with native encoder or a DNxHR one. From what I've read a 20gb+ gpu is recommended for 8k... but that means a 3090 or 4090 and they are in crazy money territory... does anyone know any other options for rendering 8k?

Click to expand...

What I understand, you can edit in 8K RAW but not render 8K footage with less than 20GB+ ram. I’m not sure what GPU is needed for that. It’s a question I also have. Maybe Cloud computing is and option?

That said, why output a 8K file? There are almost no displays in the world that can use the extra resolution. If you ever need 8K in the future, you can render it at that moment. 4K is still the highest relevant resolution.

hey thanks yes its true i dont need to output 8k, its more than i want to just because i prefer higher resolution where possible. I will probably record in 8k for now and output in 4k as usual (but still it would be nice to have the option)

barnyz · Nov 28, 2022

avidly lucid said:
Yes. You don't need to render in 8K. What I do with Canon R5 8K RAW is just do color correction and sharpening, etc.--just a few things that are good to do in RAW. Then render to 6K or 4K and finish the editing with smaller non-RAW files so it doesn't tax your system so much.

thanks. Yes I think i will probably end up doing the same thing

barnyz · Nov 28, 2022

NickZ2016 said:
Have you tried just setting your timeline to 4K? That should reduce memory requirements.

ive been working in a 1080 time and then changing it to 8k for final render. its only an issue if i try rendering in 8k. 8k is not essential its more of a nice to have and as the camera supports i wanted to try it

barnyz · Nov 28, 2022

Hendrik_nl said:
NickZ2016 said:

Have you tried just setting your timeline to 4K? That should reduce memory requirements.

Click to expand...

@TS This is a good advice. Even setting the timeline to 1080 is a good option. You can always change it to 4K when rendering.

Maybe interesting: https://blog.frame.io/2020/02/24/davinci-resolve-performance/

thanks. Some good info in that link. I have already set my timeline to 1080. Performance when editing is not the issue for me (to be clear its not great but its just about managable), its only final render that is the problem. The solution so far seems to be to output in 4k which will be fine for now while i expore other possibilities

barnyz · Nov 28, 2022

little update in case anyone is reading this thread in the future with similar problems. I was eventually able to render out an 8k video. I had to remove some zoom transitions and take out some speed warping from Retime and Scaling where i had attempted to slow some footage down. Performance in general is quite bad but it is at least possible with many compromises.

Sean Nelson · Nov 28, 2022

barnyz said:
little update in case anyone is reading this thread in the future with similar problems. I was eventually able to render out an 8k video. I had to remove some zoom transitions and take out some speed warping from Retime and Scaling where i had attempted to slow some footage down. Performance in general is quite bad but it is at least possible with many compromises.

Thanks for closing the loop on this.

I've found that "Enhanced - Better" often works quite well for retiming footage. I generally set it on that while editing so I can scrub through the video more easily, and then set it to "Speed Warp" before rendering - but it often looks good enough that I don't bother to change it.

8k render settings Davinci Resolve studio 18 windows

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