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Topic: Stutter with GPU acceleration

My system specs:
i7 5820k @ 4.375GHz
16GB DDR4 2666MHz RAM
GTX 970 @ 1490MHz/7800MHz

Without GPU acceleration enabled, running using CUVID decoding or DXVA CP or native and hardware/YADIF deinterlacing results in very smooth playback.

However, when I try GPU acceleration enabled, with DXVA copyback/native and YADIF deinterlacing, result is very stuttery even though media player reports 60FPS in both cases.

CPU usage is not even close to 30%, GPU usage maxed out at around 70%.

CPU only: https://youtu.be/RZr9m8aunxM
GPU accelerated: https://youtu.be/pTI6GhvxQdA

Re: Stutter with GPU acceleration

had the same issues with a stronger cpu and the same gpu. what did it for me was to set the processing threads manually instead of auto, saw the results right away when i changed that..... maybe it will work for you too big_smile

3 Reply by Nintendo Maniac 64 (edited by Nintendo Maniac 64 15-01-2016 04:58:42)

Re: Stutter with GPU acceleration

Indeed, try to manually change the amount of threads (Application settings -> Additional options -> Processing threads).

For your CPU you'll want to use a value of 13 at minimum, but I wouldn't be surprised if you get the best result by setting it to 23.

  • Thanks: 1

Re: Stutter with GPU acceleration

Yep. Seems like setting thread count at 13 I get perfect playback. 23 I get stutters.

If it works, there's no point in increasing the thread count, is there?

  • MAG79
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Re: Stutter with GPU acceleration

trandoanhung1991 wrote:

If it works, there's no point in increasing the thread count, is there?

Yes. You are right. You need find the optimum number. Practically it must be: Threads = logical cores * 1.8
But in each case the number can be more or less to avoid stutter or memory leaks.