Disable GPU Decoding/Encoding on Windows 'cause NVidia

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Joachim Otahal

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Disable GPU Decoding/Encoding on Windows 'cause NVidia

PostSun Sep 26, 2021 10:36 pm

Hi BlackMagic!

It is the usual problem: Nvidia is unable to do the hardware decoding - again. A know reoccurring issue for years not only in DaVinci Resolve. The issue can be forced when using "generating optimized media" with 4k h265 source. Just a few seconds and RAM usage explodes, driver crashes (or Windows with the driver). It even ignores the configured RAM limits set in the program.
I upgraded to Windows 11 to check whether it is still the same problem, and it is.
But Nvidia is, as usual, failing again to provide a stable driver. And I am not alone. The geforce forum shows many hits on that, including specifically mentioning Davinci Resolve.
GPU Acceleration for other stuff is fine, but video decoding in software is needed since Nvidia breaks it every now and then, leading to effects like driver restart, blue screen or hard freeze (black screen).
As for video encoding: I always use software since it beats Nvidia by a mile when it comes to quality vs. bitrate.
System Summary: Ryzen 5950x, 64 GB ECC RAM, Titan RTX.
So I am again in the situation not being able to use DaVinci Resolve when having an actual use for it, albeit the free edition for testing. The "DaVinci Resolve Log.zip" is avail on request.
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TheBloke

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Re: Disable GPU Decoding/Encoding on Windows 'cause NVidia

PostMon Sep 27, 2021 8:16 am

Have you tried:

Preferences -> System -> Decode Options -> Untick "Decode H264 / H265 using hardware acceleration" ?

There's also an option for "Use GPU for Blackmagic RAW decode" but it doesn't sound like you're using BRAW.
Resolve Studio 17.4.3 and Fusion Studio 17.4.3 on macOS 11.6.1

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Joachim Otahal

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Re: Disable GPU Decoding/Encoding on Windows 'cause NVidia

PostMon Sep 27, 2021 10:05 am

There is no such option in 17.3.1...
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DaVinci Resolve Decode Options.png
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Charles Bennett

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Re: Disable GPU Decoding/Encoding on Windows 'cause NVidia

PostMon Sep 27, 2021 11:15 pm

You appear to be using the Free version of Resolve. Hardware acceleration is in the Studio version.
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Studio Version Hardware Acceleration.jpg
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Resolve Studio 19.0b1 build 20
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SkierEvans

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Re: Disable GPU Decoding/Encoding on Windows 'cause NVidia

PostTue Sep 28, 2021 12:41 pm

There are quite a few other things in the Studio version too. I could not find a current difference list but you may want to look at this https://www.pcguide.com/software/guide/davinci-resolve-free-vs-studio/#elementor-toc__heading-anchor-0

I have no problem using h264 or h265 on my system.
Threadripper 1920, Gigabyte X399 DESIGNARE EX, 32G RAM, Gigabyte 4070Ti 12G, ASUS PB328Q, IP4K, WIN10 Pro 22H2, Speed Editor

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