Blackmagic Forum

I have been post producing a cinema documentary on 16.1, and upgraded to 16.1.1 this morning.

The documentary is a 52 minute timeline consisting of a majority of mp4 clips on one layer with a few short sequences with up to 6 layers of GFX. There are some FX but very few.

This timeline played fine on 16.1, but the new version has killed it. Now getting choppy out of sync playback, and in many places wont playback at all.

For me this is definitely not "a general performance and stability improvement", but quite the reverse.

Going back to 16.1, (even with its mfx op1 artifact problem) until this can get sorted out.... sigh! Just about over it.

There's also a bug on MacOS where when I try to load my project, Davinci minimizes itself to nowhere and I can't see the window. Also going back to 16.1.1

Have you test if your gpu runs with full speed 16x pci lanes or only 8x ?

Your i7 9700k is only max # 16x pci express lanes !
Is your nvme drives 4x pci ? Then you need 8x + 16x for your video card ! 24 pci lanes and you only got q6x !

Hi Ole

How do I test the GPU to see if its running full speed?

Ole Kristiansen wrote:Your i7 9700k is only max # 16x pci express lanes !
Is your nvme drives 4x pci ? Then you need 8x + 16x for your video card ! 24 pci lanes and you only got q6x !

That's not how it works. The Coffee Lake chipset used by this CPU has 24 PCI-e lanes. The CPU alone has 16, which the GPU needs for best performance. Even if it went down to 8, you still likely wouldn't see much or any degradation.

In any case, the trouble apparently started with the update, so the lanes wouldn't account for the sudden fall-off in performance.

OP: are you sure the onboard intel GPU is still disabled, or was after the update?

Hi John

Hmmm that's a good point.
I didn't think to check and see if the upgrade switched the onboard GPU on.... in fact wasn't aware that it might do that. I have sent logs to BM, and wait to see what they come back with.

Without reinstalling 16.1.1 I won't know if that was the case, but honestly, I'm just finishing this doco now, and cant have any hiccups atm.

Regards
RED

In the meantime I have had some dialogue with BMD about this matter, and they were helpful. They tested my project file, but couldn't find a problem with H264 playback under either version.

My system is very new, but after reading the threads I checked my latest driver, and it seems the manufacturer of my PC system had installed the Gaming version of the GPU driver. I have replaced it with the Studio version, reinstalled 16.1.1, and all seems to be OK now, as far as responsiveness goes.

Wouldn't have thought that it could have made that much difference, but no timeline hold ups anymore. All good at this stage.
Regards
RED

RedRider14 wrote:Hi Ole

How do I test the GPU to see if its running full speed?

Try this:

https://www.liftgammagain.com/forum/ind ... mark.3718/

then try to compare to similar cards' results (on the same or higher version of Resolve) from other people.

NOTE: this test stresses the GPU only, it doesn't tell the story of the performance of your system overall. For that you can download Puget's Resolve benchmark.