Choppy Playback - 4K 4:2:2 10bit DNxHD - "New" Dell XPS 15 (9575)

[Johnny Ciotti]

System:

Win 10 Pro

Intel Core i7 (8th Gen) Kaby Lake 8705-G (3.1 GHz)

16GB DDR4-2400 MHz

AMD Radeon Vega M GL (4GB)

1TB M.2 2280 PCIe SSD

Source Files:

Leica SL/Atomos Ninja Flame 30p 4K 4:2:2 10bit DNxHD

Clean install, all drivers updated, what am I missing? Playback should be smooth. Dropped frames or stop motion effect is what I'm seeing. If I render the footage In to Out it's okay, but that seems to be excessively long (10 mins for 1 min of footage.) This should be instant or are my expectations entirely off base?

My frame of reference is my rather ancient 2010 Mac 5,1 8 Core 32GB, PCIe SSD machine.

[Jorchmald]

Same exact problems even working 1080 footage. Looks like GPU is not doing its job. Users of previous versions as Dell XPS 15 9560 reported the same thing when using 4k models. It would really piss me off having such beast and not being able to work properly.

[R Neil Haugen]

The OP of this thread posted stats for a CPU that's only got 4 cores, and those not particularly speedy. With only 16GB of RAM, and then compared it to an earlier rig but with 8 cores & 32GB of RAM.

The Dell you referenced is also only a 4-core, standard with 16GB of RAM. And not a particularly fast running speed.

CPU frequency, Cores/threads count, and RAM-per-core matter. Immensely. Neither the OP's rig nor the Dell you mention are even close to a "beast". They're rather on the low end of practicability.

Sadly.

Neil

[mandicreally]

This. The Mac you listed as "ancient" is a dual processor workstat with 8 cores vs a 4 core laptop. Also double the memory of the laptop. 

Also the lalptop video card is only a little bit above integrated graphics. Luckily that laptop does have Thunderbolt ports. So you could plug

in a more powerful external GPU. That would vastly improve render times and export times. It may help scrubbing but that's hard to say in this case.

[Johnny Ciotti]

My work around was getting rid of the Dell XPS 15 (9575) and replacing it aftwr trying another (9575) with a Dell XPS 15 (9570) 6 Core with GTX 1050Ti and 32GB RAM .

No issues with anything now other than a whacky audio playback crackle only in Pp CC 2018 .

[bill6688]

I also encountered the same problem. The main reason is that PR does not support hardware acceleration of 422 video, and cannot use GPU acceleration. If the video decoding depends entirely on the CPU, the CPU is overwhelmed, so it is very unsmooth. It can only be solved by creating a proxy file.

[MyerPj]

I just tried files from the page below, for another thread and they work fine on my machine.

https://www.imaging-resource.com/PRODS/sony-a7s-iii/sony-a7s-iiiVIDEO.HTM

Win11
PP 22.5

12th gen i9, 64gb, nvme drives, and my lowly gtx 1070

[R Neil Haugen]

Bill,

Premiere's support of H.264/HEVC "hardware" encoding and decoding are dependent on the hardware involved. It can do long-GOP 422 on some rigs. Not on others.

And the same with GPUs that have H.264/HEVC capabilities ... if Premiere recognizes the GPU can assist the on-board hardware for this, it can get used.

The whole thing is pretty complicated and a right royal pain in the tushy. @RjL190365 has the best knowledge of this on this forum.

Neil