Problem with H265 4K - Glitches and artifacts

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Dezolate97

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Problem with H265 4K - Glitches and artifacts

PostTue Nov 30, 2021 5:55 pm

Hi everyone,
I have a strange problem with free version of Davinci Resolve 17.4.2. Recored a few clips on a Lumix S5 with 4K/60p/10 bit/MP4/H265 HEVC settings. Most of them after importing them into Resolve works well, but few of them have strange colorful artifacts and glitches on screen:
h265 problem.jpg
h265 problem.jpg (281.65 KiB) Viewed 583 times

Sadly, they are not only on playback but also apear in these fragments on video after render. Any ideas what to do? Outside Resolve they are looking fine.

My rig:
GTX 970 4GB, 32GB Ram, AMD Ryzen 5 3600

I'll be gratefull for any help. Tried different kinds of codecs, graphic card drivers etc. and nothing helped!

Thanks,
Tom
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Uli Plank

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Re: Problem with H265 4K - Glitches and artifacts

PostWed Dec 01, 2021 1:29 am

Your GPU is underpowered for 4K (actually UHD, the free version has no 4K).
The software may be free, but the hardware needed for smooth performance is not.

Resolve Studio 17.4.6 , MacOS 12.3.1
MacBook M1 Pro, 16 GPU cores, 32 GB RAM
and
iMac 2017, Radeon 580, 32 GB RAM
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ZRGARDNE

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Re: Problem with H265 4K - Glitches and artifacts

PostWed Dec 01, 2021 2:23 pm

Uli Plank wrote:Your GPU is underpowered for 4K (actually UHD, the free version has no 4K).


Free can do 4k. You need Studio for >4k.

Op must be on studio. 10bit h.265 is not available in Free on windows.


You are correct, you need 6gb of Vram for 4k exports. My 4gb GTX1650 was barely able to squeeze out 1080p
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Dwaine Maggart

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Re: Problem with H265 4K - Glitches and artifacts

PostWed Dec 01, 2021 5:54 pm

Free Resolve is limited to a UHD (not 4K) timeline and render resolution. It is not limited in source file resolution.

Free Resolve on Windows can play H.265 10 bit files if the OP was lucky enough to have the Microsoft HEVC Video Extensions package before it was removed from the Microsoft store. Or some other third party app that provides similar functionality.

OP didn't state what timeline resolution or render resolution he used.

If OP is using free Resolve, then perhaps whatever is being used to provide the H.265 10 bit capability is not happy with the files that have artifacts. Or perhaps, if he is using a UHD timeline resolution, it is an issue with low VRAM.

A link to a file that reliably reproduces the artifacts on the OPs system along with a Resolve Project Export .drp using that file, could help to determine the issue.
Dwaine Maggart
Blackmagic Design DaVinci Support
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Adrien

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Re: Problem with H265 4K - Glitches and artifacts

PostTue May 17, 2022 10:07 am

Bonjour, je rencontre le même problème avec le Lumix S5 sur la version gratuite de DaVinci cependant je possède 8go de vram et j'ai bien installé l'extension pourtant le problème persiste quelqu'un aurais une idée ?
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Uli Plank

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Re: Problem with H265 4K - Glitches and artifacts

PostTue May 17, 2022 2:04 pm

Exactly the same problem? Please give us more detail:
- Codec including bit depth and color subsampling?
- Model of GPU?
- Timeline resolution?

And please use English, if you need help there's DeepL. Not all of us understand French.
The software may be free, but the hardware needed for smooth performance is not.

Resolve Studio 17.4.6 , MacOS 12.3.1
MacBook M1 Pro, 16 GPU cores, 32 GB RAM
and
iMac 2017, Radeon 580, 32 GB RAM
Speed Editor
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Adrien

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Re: Problem with H265 4K - Glitches and artifacts

PostTue May 24, 2022 5:36 am

hello,
so I used videos in 4k 4:2:2 10bits in MP4 format (ntsc 30p) I have an NVIDIA GeForce rtx 2070 super with 8go of vram and an i7 10th generation and finally for the timeline settings I put in 4k ntsc in 30p, everything else I left by default. thank you in advance
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Uli Plank

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Re: Problem with H265 4K - Glitches and artifacts

PostTue May 24, 2022 6:18 pm

AFAIK, neither that Nvidia nor a 10th generation iGPU can decode 10 bit 4:2:2.
Transcode to a good mezzanine codec.
The software may be free, but the hardware needed for smooth performance is not.

Resolve Studio 17.4.6 , MacOS 12.3.1
MacBook M1 Pro, 16 GPU cores, 32 GB RAM
and
iMac 2017, Radeon 580, 32 GB RAM
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Mario Kalogjera

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Re: Problem with H265 4K - Glitches and artifacts

PostTue May 24, 2022 6:26 pm

If it's decoded by CPU (which it most certainly is), it is not expected to have glitches...

Can you share a short unconverted clip?
Asus Prime X370-Pro, R7 3700X@PBO, 32 GB G.Skill AEGIS DDR-4@3200MHz, Asrock RX 580 8GB, Adata A400 120 GB system SSD, A2000 500 GB scratch SSD, Media storage:"Always in motion is it", Windows 11 Pro+Resolve Studio 17.4.1+Fusion Studio 17.4.1
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Uli Plank

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Re: Problem with H265 4K - Glitches and artifacts

PostWed May 25, 2022 6:41 am

What are your settings here?
Bildschirmfoto 2022-05-25 um 08.40.45.png
Bildschirmfoto 2022-05-25 um 08.40.45.png (191.18 KiB) Viewed 130 times
The software may be free, but the hardware needed for smooth performance is not.

Resolve Studio 17.4.6 , MacOS 12.3.1
MacBook M1 Pro, 16 GPU cores, 32 GB RAM
and
iMac 2017, Radeon 580, 32 GB RAM
Speed Editor

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